Navigating car trouble can be stressful, especially when the check engine light illuminates in your Honda. Understanding what those warning lights mean is the first step to getting back on the road with confidence. That’s where On-Board Diagnostics II (OBD2) codes come in handy. This comprehensive Honda OBD2 codes list provides a detailed breakdown of potential issues your Honda vehicle might be experiencing, helping you understand the problem and seek the right solution.
OBD2 is a standardized system in most cars today, including Hondas, that allows your car’s computer to monitor various systems and components. When something goes wrong, the system generates a trouble code, often referred to as a Diagnostic Trouble Code (DTC). These codes are invaluable for mechanics and car owners alike, offering a starting point for diagnosing and repairing vehicle problems. This list specifically focuses on Honda OBD2 codes, giving you a detailed resource tailored to your vehicle.
Below, you’ll find an extensive list of Honda OBD2 codes, categorized for easier navigation. Remember, while this list is a great resource for understanding potential issues, it’s always recommended to consult a qualified mechanic for accurate diagnosis and repair. Using an OBD2 scanner can help you retrieve these codes, and this list will help you decipher what they mean for your Honda.
Powertrain (P-Codes) – Engine & Transmission Issues
The “P” in OBD2 codes signifies “Powertrain,” which covers the engine, transmission, and related components. These are some of the most common codes you might encounter.
Fuel and Air Metering
P0010 – Variable Valve Timing Control (VTC) Oil Control Solenoid Valve Malfunction: Indicates a problem with the VTC oil control solenoid valve, which is crucial for engine valve timing.
P0011 – Variable Valve Timing Control (VTC) System Malfunction: Signals a general malfunction within the Variable Valve Timing Control system, potentially affecting engine performance and efficiency.
P0101 – Mass Airflow (MAF) Sensor Range/Performance Problem: Points to an issue with the MAF sensor, which measures the air entering the engine. This can lead to incorrect fuel mixture and poor engine performance.
P0102 – Mass Airflow (MAF) Sensor Circuit Low Voltage: Indicates low voltage in the MAF sensor circuit, potentially due to a wiring problem or a faulty sensor.
P0103 – Mass Airflow (MAF) Sensor Circuit High Voltage: Signals high voltage in the MAF sensor circuit, possibly caused by a short circuit or sensor malfunction.
P0106 – Manifold Absolute Pressure (MAP) Sensor Range/Performance Problem: Indicates a problem with the MAP sensor, which measures air pressure in the intake manifold. This affects fuel delivery and engine load calculations.
P0107 – Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage: Low voltage in the MAP sensor circuit, similar to the MAF sensor low voltage issue.
P0108 – Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage: High voltage in the MAP sensor circuit, similar to the MAF sensor high voltage issue.
P0111 – Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem: Problem with the IAT sensor, which measures the temperature of the air entering the engine. This affects fuel mixture and engine performance, especially in varying temperatures.
P0112 – Intake Air Temperature (IAT) Sensor Circuit Low Voltage: Low voltage in the IAT sensor circuit.
P0113 – Intake Air Temperature (IAT) Sensor Circuit High Voltage: High voltage in the IAT sensor circuit.
P0116 – Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem: Issue with the ECT sensor, which monitors engine coolant temperature. This is vital for engine temperature regulation and fuel mixture adjustments.
P0117 – Engine Coolant Temperature (ECT) Sensor Circuit Low Input: Low input from the ECT sensor circuit, suggesting a sensor or wiring issue.
P0118 – Engine Coolant Temperature (ECT) Sensor Circuit High Input: High input from the ECT sensor circuit, also pointing to a sensor or wiring problem.
P0122 – Throttle Position (TP) Sensor Circuit Low Input: Low input from the TP sensor, which monitors the throttle valve position. This sensor is crucial for engine control and acceleration.
P0123 – Throttle Position (TP) Sensor Circuit High Input: High input from the TP sensor circuit.
P0125 – Engine Coolant Temperature (ECT) Sensor Slow Response: Indicates the ECT sensor is responding slowly, which can affect cold start performance and fuel efficiency.
P0128 – Cooling System Malfunction: General cooling system malfunction, potentially related to thermostat, radiator, or coolant levels.
Oxygen Sensors and Fuel System
P0131 – Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit Low Voltage: Low voltage in the primary oxygen sensor circuit. Oxygen sensors measure oxygen levels in the exhaust to optimize fuel mixture and emissions.
P0132 – Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit High Voltage: High voltage in the primary oxygen sensor circuit.
P0133 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Circuit Slow Response: Slow response from the rear air/fuel ratio sensor.
P0134 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) No Activity Detected: No activity detected from the air/fuel ratio sensor.
P0135 – Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction: Malfunction in the heater circuit of the primary oxygen sensor. The heater ensures the sensor reaches operating temperature quickly.
P0137 – Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Low Voltage: Low voltage in the secondary oxygen sensor circuit. Secondary sensors monitor catalytic converter efficiency.
P0138 – Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit High Voltage: High voltage in the secondary oxygen sensor circuit.
P0139 – Secondary Heated Oxygen Sensor (Secondary HO2S) Slow Response: Slow response from the secondary oxygen sensor.
P0141 – Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit Malfunction: Malfunction in the heater circuit of the secondary oxygen sensor.
P0143 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Low Voltage: Low voltage in the third oxygen sensor circuit (if applicable, some Hondas have a third sensor).
P0144 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit High Voltage: High voltage in the third oxygen sensor circuit.
P0145 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Slow Response: Slow response from the third oxygen sensor.
P0147 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Heater Circuit Malfunction: Heater circuit malfunction for the third oxygen sensor.
P0153 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Circuit Slow Response: Slow response from the front air/fuel ratio sensor on Bank 2. Bank 2 refers to the side of the engine opposite cylinder #1 in V-engines.
P0154 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction: Heater system malfunction for the front air/fuel ratio sensor on Bank 2.
P0155 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction: Heater circuit malfunction for the front air/fuel ratio sensor on Bank 2.
P0157 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Low Voltage: Low voltage in the front secondary oxygen sensor circuit on Bank 2.
P0158 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit High Voltage: High voltage in the front secondary oxygen sensor circuit on Bank 2.
P0159 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Slow Response: Slow response from the front secondary oxygen sensor on Bank 2.
P0161 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Heater Circuit Malfunction: Heater circuit malfunction for the front secondary oxygen sensor on Bank 2.
P0171 – Fuel System Too Lean: Indicates the engine is running lean, meaning there is too much air and not enough fuel in the mixture. This can be caused by vacuum leaks, fuel delivery issues, or sensor problems.
P0172 – Fuel System Too Rich: Indicates the engine is running rich, meaning there is too much fuel and not enough air in the mixture. This can be caused by faulty injectors, a stuck fuel pressure regulator, or sensor problems.
P0174 – Front Bank (Bank 2) Fuel System Too Lean: Fuel system too lean specifically on Bank 2.
P0175 – Front Bank (Bank 2) Fuel System Too Rich: Fuel system too rich specifically on Bank 2.
P0191 – Fuel Pressure Sensor Range/Performance Problem: Issue with the fuel pressure sensor, which monitors fuel pressure in the fuel rail.
P0192 – Fuel Pressure Sensor Circuit Low Voltage: Low voltage in the fuel pressure sensor circuit.
P0193 – Fuel Pressure Sensor Circuit High Voltage: High voltage in the fuel pressure sensor circuit.
P0196 – EOT Sensor/Range Performance Problem: Engine Oil Temperature (EOT) sensor performance issue.
P0197 – EOT Sensor Circuit Low Voltage: Low voltage in the EOT sensor circuit.
P0198 – EOT Sensor Circuit High Voltage: High voltage in the EOT sensor circuit.
Throttle and Misfire Codes
P0222 – Throttle Position (TP) Sensor 2 Circuit Low Voltage: Low voltage in the secondary throttle position sensor circuit (some Hondas have dual TP sensors for redundancy).
P0223 – Throttle Position (TP) Sensor 2 Circuit High Voltage: High voltage in the secondary throttle position sensor circuit.
P0300 – Random Misfire: Indicates random misfires are occurring across multiple cylinders. Misfires happen when combustion is incomplete or doesn’t occur in a cylinder, leading to rough running and potential engine damage.
P0301 – No. 1 Cylinder Misfire: Misfire specifically in cylinder #1.
P0302 – No. 2 Cylinder Misfire: Misfire in cylinder #2.
P0303 – No. 3 Cylinder Misfire: Misfire in cylinder #3.
P0304 – No. 4 Cylinder Misfire: Misfire in cylinder #4.
P0305 – No. 5 Cylinder Misfire: Misfire in cylinder #5 (for engines with 5+ cylinders).
P0306 – No. 6 Cylinder Misfire: Misfire in cylinder #6 (for engines with 6+ cylinders).
Sensors – Knock, Crankshaft, Camshaft
P0325 – Knock Sensor Circuit Malfunction: Malfunction in the knock sensor circuit. The knock sensor detects engine knocking or pinging, which can damage the engine if not addressed.
P0335 – Crankshaft Position (CKP) Sensor Circuit No Signal: No signal from the crankshaft position sensor. This sensor is vital for engine timing and ignition.
P0336 P0339 – Crankshaft Position (CKP) Sensor Circuit Intermittent Interruption: Intermittent signal interruption from the CKP sensor.
P0340 – Camshaft Position (CMP) Sensor No Signal: No signal from the camshaft position sensor. Like the CKP sensor, the CMP sensor is crucial for engine timing and fuel injection.
P0341 – Camshaft Position (CMP) Sensor A Intermittent Interruption: Intermittent signal interruption from camshaft position sensor A.
P0341 – Variable Valve Timing Control (VTC) Phase Gap: Indicates a phase gap in the Variable Valve Timing Control system, potentially related to timing chain or VTC actuator issues.
P0344 – Camshaft Position (CMP) Sensor Intermittent Interruption: Another code for intermittent CMP sensor signal.
P0365 – Camshaft Position (CMP) Sensor B No Signal: No signal from camshaft position sensor B (for engines with multiple camshafts).
P0366 P0369 – Camshaft Position (CMP) Sensor B Intermittent Interruption: Intermittent signal from camshaft position sensor B.
P0385 – Crankshaft Position (CKP) Sensor B No Signal: No signal from crankshaft position sensor B (if equipped).
P0389 – Crankshaft Position (CKP) Sensor B Intermittent Interruption: Intermittent signal from crankshaft position sensor B.
Emissions Control – EGR, Air Pump, Catalyst, EVAP
P0401 – Exhaust Gas Recirculation (EGR) Insufficient Flow: Insufficient flow in the EGR system. The EGR system recirculates a portion of exhaust gas back into the intake to reduce NOx emissions.
P0404 – Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance Problem: Performance issue with the EGR control circuit.
P0406 – Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage: High voltage in the EGR valve position sensor circuit.
P0410 – Air Pump Circuit Malfunction: Malfunction in the air pump circuit. The air pump is part of the secondary air injection system, used to reduce emissions during cold starts.
P0411 – Secondary Air Injection System Incorrect Flow: Incorrect flow in the secondary air injection system.
P0420 – Catalyst System Efficiency Below Threshold: Catalytic converter efficiency is below the required threshold. This usually indicates a failing catalytic converter.
P0430 – Front Bank Catalyst System Efficiency Below Threshold (Bank 2): Catalyst efficiency below threshold specifically for Bank 2 catalytic converter.
P0441 – Evaporative Emission (EVAP) Control System Incorrect Purge Flow: Incorrect purge flow in the EVAP system. The EVAP system prevents fuel vapors from escaping into the atmosphere.
P0442 – Evaporative Emission (EVAP) System Small Leak Detected: Small leak detected in the EVAP system.
P0443 – Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction: Malfunction in the EVAP canister purge valve circuit.
P0451 – Fuel Tank Pressure (FTP) Sensor Range/Performance Problem: Performance issue with the fuel tank pressure sensor, part of the EVAP system.
P0452 – Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage: Low voltage in the fuel tank pressure sensor circuit.
P0453 – Fuel Tank Pressure (FTP) Sensor Circuit High Voltage: High voltage in the fuel tank pressure sensor circuit.
P0456 – Evaporative Emission (EVAP) System Very Small Leak Detected: Very small leak in the EVAP system.
P0457 – Evaporative Emission (EVAP) System Leak Detected Fuel Fill Cap Loose/Off: EVAP leak detected, often due to a loose or missing fuel cap.
P0461 – Fuel Gauge Sending Unit Range/Performance Problem: Issue with the fuel gauge sending unit, affecting fuel level readings.
P0462 – Fuel Gauge Sending Unit Circuit Low Voltage: Low voltage in the fuel gauge sending unit circuit.
P0463 – Fuel Gauge Sending Unit Circuit High Voltage: High voltage in the fuel gauge sending unit circuit.
P0496 – Evaporative Emission (EVAP) System High Purge Flow: High purge flow in the EVAP system.
P0497 – Evaporative Emission (EVAP) System Low Purge Flow: Low purge flow in the EVAP system.
P0498 – Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit Low Voltage: Low voltage in the EVAP canister vent shut valve control circuit.
P0499 – Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit High Voltage: High voltage in the EVAP canister vent shut valve control circuit.
Speed Sensors and Idle Control
P0500 – Vehicle Speed Sensor (VSS) Circuit Malfunction: Malfunction in the vehicle speed sensor circuit. This affects speedometer readings, transmission shifting, and cruise control.
P0501 – Vehicle Speed Sensor (VSS) Range/Peformance Problem: Performance issue with the VSS.
P0505 – Idle Control System Malfunction: Malfunction in the idle control system, which regulates engine idle speed.
P0506 – Idle Control System RPM Lower Than Expected: Idle RPM is lower than expected.
P0507 – Idle Control System RPM Higher Than Expected: Idle RPM is higher than expected.
P0511 – Idle Air Control (IAC) Valve Circuit Malfunction: Malfunction in the Idle Air Control valve circuit. The IAC valve controls airflow to regulate idle speed.
Oil Pressure and ECM/PCM Issues
P0521 – EOP Sensor Range/Performance Problem: Engine Oil Pressure (EOP) sensor performance issue.
P0522 – EOP Sensor Circuit Low Voltage: Low voltage in the EOP sensor circuit.
P0523 – EOP Sensor Circuit High Voltage: High voltage in the EOP sensor circuit.
P0560 – ECM Back-up Circuit Low Voltage: Low voltage in the ECM (Engine Control Module) backup circuit, which maintains memory when the ignition is off.
P0563 – Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage: Unexpected voltage in the ECM/PCM power source circuit.
P0600 – Multiplex Control System Troubleshooting: General issue with the multiplex control system, which manages communication between different vehicle modules.
P0603 – ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error: Error in the ECM/PCM’s Keep Alive Memory, which stores learned data.
P0606 – ECM/PCM Processor Malfunction: Malfunction within the ECM/PCM processor itself.
P0661 – Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit Low Voltage: Low voltage in the IMRC valve position sensor circuit. The IMRC system optimizes intake airflow for different engine speeds.
P0662 – Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit High Voltage: High voltage in the IMRC valve position sensor circuit.
P0685 – ECM/PCM Power Relay Control Circuit Malfunction: Malfunction in the ECM/PCM power relay control circuit.
Transmission Codes (P0700 – P0986)
Codes from P0700 to P0986 generally relate to the automatic transmission system. These codes cover a wide range of issues, from transmission control system problems to specific solenoid and sensor malfunctions. Due to the extensive nature of these codes, and their specificity to automatic transmission systems, they are listed below for completeness, but detailed descriptions for each are beyond the scope of this introductory guide. If you encounter codes in this range, consulting a professional mechanic specializing in transmissions is highly recommended.
- P0700 – Automatic Transmission Control System
- P0705 – Short in Transmission Range Switch Circuit (Multiple Shift-position Input)
- P0706 – Open in Transmission Range Switch Circuit
- P0710 P0711 – Problem in ATF Temperature Sensor Circuit
- P0712 – Short in ATF Temperature Sensor Circuit
- P0713 – Open in ATF Temperature Sensor Circuit
- P0715 P0716 – Problem in Mainshaft Speed Sensor Circuit
- P0717 – Problem in Mainshaft Speed Sensor Circuit (No Signal Input)
- P0718 – Mainshaft Speed Sensor Intermittent Failure
- P0720 – Countershaft Speed Sensor Circuit Malfunction
- P0720 P0721 – Problem in Countershaft Speed Sensor Circuit
- P0722 – Problem in Countershaft Speed Sensor Circuit (No Signal Input)
- P0723 – Countershaft Speed Sensor Intermittent Failure
- P0725 – Engine Speed Input Circuit Malfunction
- P0730 – Problem in Shift Control System
- P0731 – Problem in 1st Clutch and 1st Clutch Hydraulic Circuit
- P0732 – Problem in 2nd Clutch and 2nd Clutch Hydraulic Circuit
- P0733 – Problem in 3rd Clutch and 3rd Clutch Hydraulic Circuit
- P0734 – Problem in 4th Clutch and 4th Clutch Hydraulic Clutch
- P0735 – Problem in 5th Clutch and 5th Clutch Hydraulic Circuit
- P0740 – Problem in Lock-up Control System
- P0741 – Torque Converter Clutch Hydraulic Clutch Stuck OFF
- P0743 – Problem in Torque Converter Clutch Solenoid Valve Circuit
- P0745 – Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0746 – A/T Clutch Pressure Control Solenoid Valve A Stuck OFF
- P0747 – A/T Clutch Pressure Control Solenoid Valve A Stuck ON
- P0748 – Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0750 – Problem in Hydraulic Control System of Shift Solenoid Valve A Circuit
- P0751 – Shift Solenoid Valve A Stuck OFF
- P0752 – Shift Solenoid Valve A Stuck ON
- P0753 – Problem in Shift Solenoid Valve A Circuit
- P0756 – Shift Solenoid Valve B Stuck OFF
- P0757 – Shift Solenoid Valve B Stuck ON
- P0758 – Problem in Shift Solenoid Valve B Circuit
- P0761 – Shift Solenoid Valve C Stuck OFF
- P0762 – Shift Solenoid Valve C Stuck ON
- P0763 – Problem in Shift Solenoid Valve C Circuit
- P0771 – Shift Solenoid Valve E Stuck OFF
- P0773 – Problem in Shift Solenoid Valve E Circuit
- P0775 – Problem in the Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0776 – A/T Clutch Pressure Control Solenoid Valve B Stuck OFF
- P0777 – A/T Clutch Pressure Control Solenoid Valve B Stuck ON
- P0778 – Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0780 – Problem in Shift Control System
- P0795 – Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve C Circuit
- P0796 – A/T Clutch Pressure Control Solenoid Valve C Stuck OFF
- P0797 – A/T Clutch Pressure Control Solenoid Valve C Stuck ON
- P0798 – Problem in A/T Clutch Pressure Control Solenoid Valve C Ciruit
- P0812 – Open in Transmission Range Switch ATP RVS Switch Circuit
- P0842 – Short in 2nd Clutch Transmission Fluid Pressure Switch Clutch, or 2nd Clutch Transmission Fluid Pressure Switch (Clutch) Stuck ON
- P0843 – Open in 2nd Clutch Transmission Fluid Pressure Switch Circuit, or 2nd Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0845 – Problem in 3rd Clutch Pressure Switch Circuit
- P0847 – Short in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck ON
- P0848 – Open in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0872 – Short in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck ON
- P0873 – Open in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0962 – Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0963 – Problem in A/T Clutch Pressure Control Solenoid Valve A
- P0966 – Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0967 – Problem in A/T Clutch Pressure Control Solenoid Valve B
- P0970 – Problem in A/T Clutch Pressure Control Solenoid Valve C Circuit
- P0971 – Problem in A/T Clutch Pressure Control Solenoid Valve C
- P0973 – Short in Shift Solenoid Valve A Circuit
- P0974 – Open in Shift Solenoid Valve A Circuit
- P0976 – Short in Shift Solenoid Valve B Circuit
- P0977 – Open in Shift Solenoid Valve B Circuit
- P0979 – Short in Shift Solenoid Valve C Circuit
- P0980 – Open in Shift Solenoid Valve C Circuit
- P0982 – Short in Shift Solenoid Valve D Circuit
- P0983 – Open in Shift Solenoid Valve D Circuit
- P0985 – Short in Shift Solenoid Valve E Circuit
- P0986 – Open in Shift Solenoid Valve E Circuit
VTEC System and More Engine Related Codes (P1020 – P1895)
This section covers codes related to Honda’s Variable Timing and Lift Electronic Control (VTEC) system, as well as other engine and powertrain related malfunctions.
- P1020 – Valve Pause System Stuck Off
- P1021 – Valve Pause System Stuck On
- P1025 – Valve Pause System Sticking Off
- P1026 – Valve Pause System Sticking On
- P1077 – Intake Manifold Runner Control (IMRC) System Malfunction (Low rpm)
- P1078 – Intake Mainfold Runner Control (IMRC) System Malfunction (High rpm)
- P1106 – Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem
- P1107 – Barometric Pressure (BARO) Sensor Circuit Low Voltage
- P1108 – Barometric Pressure (BARO) Sensor Circuit High Voltage
- P1121 – Throttle Position (TP) Sensor Lower Than Expected
- P1122 – Throttle Position (TP) Sensor Higher Than Expected
- P1128 – Manifold Absolute Pressure (MAP) Sensor Circuit Lower Than Expected
- P1129 – Manifold Absolute Pressure (MAP) Sensor Circuit Higher Than Expected
- P1130 – Demand for Changing Both Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) and Third Heated Oxygen Sensor (Third HO2S) (Sensor 3)
- P1149 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1149 – Air/Fuel Ratio Sensor (Sensor 1) Circuit Lean Range
- P1157 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS Line High Voltage
- P1157 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Circuit High Voltage
- P1157 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1158 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Terminal Low Voltage
- P1159 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Terminal Low Voltage
- P1162 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response
- P1163 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response
- P1163 – Air/Fuel Ratio Sensor (Sensor 1) Slow Response
- P1164 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1164 – Air/Fuel Ratio (AF) Sensor (Sensor 1) Circuit Range/Performance
- P1165 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1165 – Air/Fuel Ratio Sensor (Sensor 1) Circuit Range/Performance
- P1166 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Electrical Problem
- P1166 – Heated Oxgen Sensor Sensor1 (Primary HO2S) Heater Circuit Malfunction
- P1167 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Malfunction
- P1167 – Heated Oxygen Sensor Sensor1 (Primary LAF HO2S) Heater System Malfunction
- P1168 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL Low Voltage
- P1169 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL High Voltage
- P1182 – Fuel Temperature Sensor Circuit Low Voltage
- P1183 – Fuel Temperature Sensor Circuit High Voltage
- P1253 P1259 – VTEC System Malfunction
- P1297 – Electric Load Detector (ELD) Circuit Low Voltage
- P1298 – Electric Load Detector (ELD) Circuit High Voltage
- P1300 – Random Misfire
- P1324 – Knock Sensor Power Source Circuit Low Voltage
- P1336 – Engine Speed (RPM) Fluctuation Sensor Intermittent Interruption
- P1337 – Engine Speed (RPM) Fluctuation Sensor No Signal
- P1355 – Front Ignition Coil Power Circuit Malfunction
- P1359 – Crankshaft Position (CKP)/Top Dead Center (TDC) Sensor Circuit Malfunction
- P1361 – Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) Intermittent Interruption
- P1361 – Top Dead Center (TDC) Sensor Intermittent Interruption
- P1362 – Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) No Signal
- P1362 – Top Dead Center (TDC) Sensor No Signal
- P1366 – Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) Intermittent Interruption
- P1366 – Top Dead Center (TDC) Sensor 2 Intermittent Interruption
- P1367 – Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) No Signal
- P1367 – Top Dear Center (TDC) Sensor 2 No Signal
- P1381 – Cylinder Position (CYP) Sensor Intermittent Interruption
- P1382 – Cylinder Position (CYP) Sensor No Signal
- P1410 – Air Pump Malfunction
- P1415 – Air Pump Electric Current Sensor Circuit Low Voltage
- P1416 – Air Pump Electric Current Sensor Circuit High Voltage
- P1420 – Nox Adsorptive Catalyst System Efficiency Below Threshold
- P1438 – Motor Drive Module (MDM) Overheating Signal Circuit
- P1438 – Motor Drive Module (MDM) Overheating
- P1439 – Motor Drive Module (MDM) Short Circuit Sensor Problem
- P1439 – Motor Drive Module (MDM) Short Circuit
- P1440 – IMA System Problem
- P1445 – Bypass Control Problem
- P1448 P1449 – Battery Module Overheating
- P1449 – Battery Cell Overheating
- P1449 – Battery Module Individual Voltage Input Deviation
- P1449 – Battery Module Deterioration
- P1449 – Battery Module Deviation
- P1454 – Fuel Tank Pressure (FTP) Sensor Range/Performance Problem
- P1456 – Evaporative Emissions (EVAP) Control System Leakage (Fuel Tank System)
- P1457 – Evaporative Emissions (EVAP) Control System Leakage (EVAP Canister System)
- P1459 – Evaporative Emission (EVAP) Purge Flow Switch Malfunction
- P1491 – Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
- P1486 – Cooling System Malfunction
- P1491 – Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
- P1498 – Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage
- P1505 – Positive Crankcase Ventilation (PCV) Air Leakage
- P1508 P1519 – Idle Air Control Valve (IACV) Circuit Malfunction
- P1509 – Idle Air Control Valve (IACV) Circuit Failure
- P1522 – Brake Booster Pressure Sensor Circuit Low Voltage
- P1523 – Brake Booster Pressure Sensor Circuit High Voltage
- P1524 – Brake Booster Pressure Sensor Range/Performance Problem
- P1541 – Climate Control Unit Signal Circuit Low Voltage
- P1542 – Climate Control Unit Signal Circuit High Voltage
- P1565 – Motor Commutation Signal Problem
- P1568 – Battery Module Individual Voltage Input Problem
- P1568 – Battery Module Temperature Signal Circuit Problem
- P1568 – Battery Cell Temperature Signal Circuit Problem
- P1572 – Motor Drive Module (MDM) Temperature Signal Circuit Low Input
- P1572 – Motor Drive Module (MDM) Temperature Signal Circuit High Input
- P1576 – Motor Drive Module (MDM) Voltge Signal Circuit Low Input
- P1577 – High Voltage Detection Signal Circuit Problem
- P1580 – Battery Current Circuit Problem
- P1581 – Motor Power Inverter (MPI) Module Current Signal Circuit Low Input
- P1581 – Motor Power Inverter (MPI) Module Current Signal Circuit High Input
- P1581 – Motor Power Inverter (MPI) Module Current Signal Circuit Problem
- P1582 – Motor Current U Phase Signal Circuit Low Input
- P1582 – Motor Current U Phase Signal Circuit High Input
- P1583 – Motor Current V Phase Signal Circuit Low Input
- P1583 – Motor Current V Phase Signal Circuit High Input
- P1584 – Motor Current W Phase Signal Circuit Low Input
- P1584 – Motor Current W Phase Signal Circuit High Input
- P1585 – Motor Current Signal Circuit Problem
- P1586 – Motor Power Inverter (MPI) Module Current Signal/Battery Current Signal Circuit Problem
- P1607 – Engine Control Module (ECM)/Powertrain Control Module (PCM) Internal Circuit Malfunction
- P1630 – Transmission Control Module
- P1635 – Battery Condition Monitor (BCM) Module Proble
- P1639 – MOTB Signal Circuit Malfunction
- P1640 – ACTTRQ Motor Torque Signal Circuit Low Input
- P1641 – ACTTRQ Motor Torque Signal Circuit High Input
- P1642 – QBATT Battery Signal Circuit Low Input
- P1643 – QBATT Battery Signal Circuit High Input
- P1644 – MOTFSA Signal Malfunction
- P1645 – MOTFSB Signal Malfunction
- P1646 – MOTSTB Signal Malfunction
- P1647 – Power Command Signal Circuit Low Input
- P1647 – Power Command Signal Circuit High Input
- P1647 – Engine Torque Signal Circuit Low Input
- P1647 – Engine Torque Signal Circuit High Input
- P1647 – Mode Signal Circuit 1 Low Input
- P1647 – Mode Signal Circuit 1 High Input
- P1647 – Mode Signal Circuit 2 Problem
- P1647 – Engine Speed Signal Circuit Problem
- P1648 – Battery Condition Monitor (BCM) Module Communication Signal Circuit Problem
- P1648 – Motor Control Module (MCM) Communication Signal Circuit Problem
- P1655 – CVT-FI TMA/TMB Signal Line Failure
- P1656 – Problem in PCM-toVTM-4 Control Unit Communications Circuit
- P1660 – A/T-FI Data Line Failure/TCM – ECM Halt
- P1676 P1678 – FPTDR Signal Line Failure
- P1679 – RSCD Signal Circuit Malfunction
- P1681 – A/T FI Signal A Cicuit Low Voltage
- P1682 – A/T FI Signal A Circuit High Voltage
- P1683 – Throttle Valve Default Position Spring Performance Problem
- P1684 – Throttle Valve Return Spring Performance Problem
- P1686 – A/T FI Signal B Circuit Low Voltage
- P1687 – A/T FI Signal B Circuit High Voltage
- P1705 – Short in Transmission Range Switch Circuit (More than one range position is on at the same time)
- P1706 – Open in Transmission Range Switch Circuit
- P1709 – Problem Transmission Gear Selection Switch Circuit
- P1730 – Problem in Shift Control System: Shift Solenoid Valve A and D Stuck OFF Shift Solenoid Valve B Stuck ON Shift Valves A, B, and D Stuck
- P1731 – Problem in Shift Control System: Shift Solenoid Valve E Stuck ON Shift Valve E Stuck A/T Clutch Pressure Control Solenoid Valve A Stuck OFF
- P1732 – Problem in Shift Control System: Shift Solenoid Valve B and C Stuck ON Shift Valves B and C Stuck
- P1733 – Problem in Shift Control System: Shift Solenoid Valve D Stuck ON Shift Valve D Stuck A/T Clutch Pressure Control Solenoid Valve C Stuck OFF
- P1734 – Problem in Shift Control System: Shift Solenoid Valves B and C Stuck ON Shift Valves B and C Stuck
- P1738 – Problem in 2nd Clutch Pressure Switch Circuit
- P1739 – Problem in 3rd Clutch Pressure Switch Circuit
- P1740 – Problem in 4th Clutch Pressure Switch Circuit
- P1750 – Mechanical Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve Assemblies A and B, or Problem in the Hydraulic Control System
- P1751 – Mechanical Problem in Hydraulic Control System of Shift Solenoid Valve B and A/T Clutch Pressure Control Solenoid Valves A and B, or Problem in the Hydraulic Control System
- P1753 – Problem in Torque Converter Clutch Solenoid Valve Circuit
- P1751 P1768 – Problem in Torque Converter Clutch Solenoid Valve B Circuit
- P1773 – Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P1790 – Throttle Position (TP) Sensor Circuit Malfunction
- P1791 – Vehicle Speed Sensor (VSS) Range/Performance Problem
- P1792 – Problem in Engine Coolant Temperature (ECT) Sensor Circuit
- P1793 – Manifold Absolute Pressure Sensor Circuit
- P1870 – Problem in CVT Speed Change Control Valve Assembly Circuit
- P1873 – Problem in CVT Pulley Pressure Control Valve Assembly Circuit
- P1879 – Problem in CVT Start Clutch Pressure Control Valve Assembly Circuit
- P1882 – Problem in Inhibitor Solenoid Circuit
- P1884 – Secondary Gear Speed Sensor 2 Circuit Malfunction
- P1885 – CVT Drive Pulley Speed Sensor Circuit
- P1886 – CVT Driven Pulley Speed Sensor Circuit
- P1888 – CVT Speed Sensor
- P1889 – Problem in CVT Speed Sensor 2 Circuit
- P1890 – Shift Control System
- P1891 – Problem in Start Clutch System
- P1894 – CVT Speed Change Control Valve Circuit
- P1895 – CVT Pulley Pressure Control Valve Circuit
Throttle Actuator and Accelerator Pedal Codes (P2101 – P2176)
These codes focus on the electronic throttle control system, including the throttle actuator and accelerator pedal position sensors.
- P2101 – Throttle Actuator System Malfunction
- P2108 – Throttle Actuator Control Module Problem
- P2118 – Throttle Actuator Current Range/Performance Problem
- P2122 – Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit Low Voltage
- P2123 – Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit High Voltage
- P2127 – Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit Low Voltage
- P2128 – Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit High Voltage
- P2135 – Throttle Position (TP) Sensor 1/2 Incorrect Voltage Correlation
- P2138 – Accelerator Pedal Position (APP) Sensor 1/2 (Throttle Position Sensor D/E) Incorrect Voltage Correlation
- P2176 – Throttle Actuator Control System Idle Position Not Learned
Air/Fuel Ratio Sensor and System Lean/Rich Codes (P2195 – P2A03)
This section includes codes related to air/fuel ratio sensors and general system lean or rich conditions detected by the sensors.
- P2195 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Signal Stuck Lean
- P2197 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Signal Stuck Lean
- P2227 – Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem
- P2228 – Barometric Pressure (BARO) Sensor Circuit Low Voltage
- P2229 – Barometric Pressure (BARO) Sensor Circuit High Voltage
- P2237 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line High Voltage
- P2238 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Line Low Voltage
- P2238 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line Low Voltage
- P2240 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line High Voltage
- P2241 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line Low Voltage
- P2243 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line High Voltage
- P2245 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line Low Voltage
- P2247 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line High Voltage
- P2249 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line Low Voltage
- P2251 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VS Line High Voltage
- P2252 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Line Low Voltage
- P2254 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line High Voltage
- P2255 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line Low Voltage
- P2279 – Intake Air System Leak
- P2413 – Exhaust Gas Recirculation (EGR) System Range/Performance Problem
- P2422 – Evaporative Emission (EVAP) System Vent Shut Valve Close Malfunction
- P2552 – Throttle Actuator Control Module Relay Malfunction
- P2627 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage
- P2628 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage
- P2630 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage
- P2631 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage
- P2646 – VTEC Oil Pressure Switch Circuit Low Voltage
- P2647 – VTEC Oil Pressure Switch Circuit High Voltage
- P2648 – VTEC Solenoid Valve Circuit Low Voltage
- P2649 – VTEC Solenoid Valve Circuit High Voltage
- P2769 – Short in Torque Converter Clutch Solenoid Valve Circuit
- P2770 – Open in Torque Converter Clutch Solenoid Valve Circuit
- P2A00 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P2A03 – Front A/F Sensor Circuit (Bank 2, Sensor 1) Circuit Range/Performance Problem
Network/Communication (U-Codes)
“U” codes indicate network or communication issues between different computer modules in your Honda. These are less common than P-codes but can point to significant problems within the vehicle’s electronic systems.
- U0073 – FCAN Malfunction (Bus-off)
- U0107 – Lost Communication With Throttle Actuator Control Module
- U0121 – FCAN Malfunction (TCS-PCM)
- U0155 – FCAN Malfunction (Gauge Control Module-ECM/PCM)
Conclusion
This Honda OBD2 codes list offers a comprehensive guide to understanding potential issues with your vehicle. While this list is extensive, it’s important to remember that diagnosing car problems can be complex. Retrieving a code is just the first step. Proper diagnosis often requires further investigation, including checking wiring, sensors, and performing specific tests.
For accurate diagnosis and repair, always consult a certified mechanic. They have the expertise, tools, and resources to pinpoint the exact cause of the problem and perform the necessary repairs to get your Honda running smoothly and reliably again. Use this list of Honda OBD2 codes as an informative resource to be better prepared when addressing your vehicle’s needs.
