Experiencing your dashboard light up like a Christmas tree and your car acting erratically can be incredibly stressful. For one Jeep Grand Cherokee owner, a recent jog in the park turned into a troubleshooting session when their vehicle started exhibiting bizarre electrical and transmission issues. Upon returning to their 2014 Jeep Grand Cherokee 3.6 V6 4×4 Overland, remote start failed, and turning the ignition revealed a cascade of warning lights: ABS, brake, check engine, traction control, and more. The digital display cycled through error messages like “service shifter,” “check air suspension,” and “check ABS system,” before the entire dashboard went dark, flickering back on sporadically. The vehicle initially refused to engage any gear, and even after managing to drive home, the journey was plagued by a rough engine and non-functioning turn signals.
Armed with a Foseal diagnostic OBD2 code reader and apps like inCarDoc and OBD Fusion, the owner began troubleshooting. Initial scans revealed 17 Diagnostic Trouble Codes (DTCs). While most cleared, six permanent faults remained stubbornly present. However, an intriguing discovery was made: with the auto drive obd2 eobd code reader plugged in, the Jeep started without issue. The ominous “service shifter” error vanished, leaving only the air suspension and traction control lights illuminated. A test drive around the block confirmed smooth operation. But, upon parking, disconnecting the auto drive obd2 eobd code reader, and restarting, the original chaos of errors returned.
Further investigation included checking the shifter fuse, which was found to be in good condition. A battery disconnect, performed by removing the negative terminal first and then the positive, followed by a 30-minute wait and reconnection in reverse order, also proved ineffective. Connecting the auto drive obd2 eobd code reader again allowed for clearing all DTCs, but they reappeared immediately upon restarting the vehicle without the reader plugged in.
This peculiar situation raises a critical question: why does an OBD2 reader seem to temporarily resolve these significant vehicle issues, only for them to return when the reader is disconnected? While a definitive diagnosis requires professional expertise, this behavior strongly suggests a potential issue related to the vehicle’s communication network or a module that relies on the OBD2 port connection for proper function or reset.
One possible explanation could be a loose or corroded connection in the car’s CAN bus (Controller Area Network) system. The CAN bus is the central nervous system of modern vehicles, facilitating communication between various electronic control units (ECUs). A faulty connection could disrupt signal transmission, leading to the widespread errors observed. Plugging in an eobd code reader might temporarily bridge a gap in this connection, or provide a stable ground, allowing for communication to resume – until it’s removed.
Another possibility involves a failing or malfunctioning module, such as the Transmission Control Module (TCM), Anti-lock Braking System (ABS) module, or even the Powertrain Control Module (PCM). These modules rely on stable voltage and communication signals. It’s conceivable that a module is experiencing a voltage drop or signal interruption, causing it to throw errors and malfunction. The act of plugging in an auto drive obd2 eobd code reader could, in some scenarios, provide a slight voltage stabilization or a temporary reset to the module, masking the underlying problem.
It’s important to understand that while an OBD2 code reader is an invaluable tool for diagnosing car problems, it is not a repair solution in itself. In this case, the reader is acting as a temporary band-aid, masking a more fundamental issue that needs professional attention. Driving with persistent electrical or transmission problems is not advisable and could lead to further damage or safety concerns.
For the Jeep Grand Cherokee owner, the next logical step is to visit a dealership, especially given the presence of an extended warranty. While the $500 deductible is a concern, it’s likely a worthwhile investment to properly diagnose and repair what could be a complex electrical or module-related issue. Going to the dealership armed with the detailed symptoms and the observation about the auto drive obd2 eobd code reader‘s temporary effect will be beneficial in guiding the diagnostic process.
In conclusion, the situation highlights the perplexing nature of modern automotive electrical problems. While the temporary signal restoration with an auto drive obd2 eobd code reader provides a valuable clue, it underscores the need for expert diagnosis to pinpoint the root cause – be it a CAN bus issue, a failing module, or another underlying electrical fault. Don’t rely on the reader as a permanent fix; seek professional help to ensure your vehicle is safe and reliably operational.
