OBD2 Data Logger App: The Ultimate Guide to Car Data Recording & Visualization

Want to unlock the hidden insights within your car’s data?

This guide explores the world of OBD2 data logging, revealing the top benefits and practical applications. Learn how an Obd2 Data Logger App, combined with the right hardware, can empower you to record, analyze, and visualize your vehicle’s performance like never before. We’ll also provide example use cases and even offer sample OBD2 data for hands-on exploration.

Unlike basic OBD2 scanners, tools like the CANedge provide a robust and flexible solution for logging and processing your car’s data exactly how you want it. With 100% free software and APIs, including browser-based dashboards, you gain complete control over your vehicle data.

Visualize your OBD2 data with a free, open-source browser dashboard.

Discover why the CANedge is the ideal choice for advanced CAN and OBD2 data logging and telematics.

Quick Tip: Watch our 4-minute introductory video above to get started!

Understanding OBD2 Data Logging: How It Works

Let’s briefly recap the fundamentals of OBD2 (On-Board Diagnostics II). OBD2 is a standardized system in modern vehicles that provides access to a wealth of parameters, known as OBD2 PIDs (Parameter IDs). These PIDs offer a consistent way to monitor and record data across a wide range of car makes and models.

Logging OBD2 data involves a straightforward 3-step process:

Configuration: Set up your OBD2 logger with the specific OBD2 PIDs you want to record.
Connection: Connect the logger to your car’s OBD2 port using an OBD2 adapter to initiate data logging.
Extraction & Decoding: Retrieve the logged data from the SD card and use free software/APIs to decode it into human-readable values.

For more detailed instructions, refer to our comprehensive FAQs below or explore our dedicated guides:

CLX000 OBD2 guide
CANedge OBD2 guide

Diagram illustrating the OBD2 data logging process: connecting to the OBD2 port, recording data, and using software for analysis.

Top 4 Advantages of OBD2 Data Logging

OBD2 data logging unlocks valuable insights from virtually any car. Here are four key benefits:

OBD2 data logging for OEM part analysis and vehicle optimization.

1. Driver, Vehicle, and Part Optimization

OBD2 data provides the raw information needed to monitor and improve driving habits, fine-tune vehicle performance, and assess the real-world behavior of car components. For instance, Original Equipment Manufacturers (OEMs) can utilize logged data to benchmark the performance of new prototype parts under diverse driving conditions. This data-driven approach allows for iterative improvements and faster development cycles.

Troubleshooting intermittent car issues with OBD2 data logging.

2. Diagnostics of Intermittent Issues

Some vehicle problems are elusive, occurring sporadically during driving but disappearing when a mechanic attempts to diagnose them. OBD2 logging becomes invaluable in these situations. By recording data continuously, you capture the vehicle’s state around the time of the event, providing critical clues for troubleshooting and repair. Analyzing the data from the moments leading up to, during, and after an issue can pinpoint the root cause, saving time and frustration.

Fleet management and vehicle telematics using OBD2 data loggers.

3. Streamlined Car Fleet Management

For businesses managing vehicle fleets, OBD2 telematics offers a powerful tool for optimization. At a fleet level, OBD2 data enables:

Driver Behavior Analysis: Monitor driving patterns to promote safer and more efficient driving.
Fuel Cost Reduction: Identify and address fuel-inefficient driving habits or vehicle issues.
Preventative Maintenance: Detect early warning signs of potential breakdowns, reducing downtime and repair costs.
Compliance Monitoring: Ensure adherence to company policies or regulatory requirements.
Dispute Resolution: Provide objective data in case of accidents or disputes.
Predictive Maintenance: Leverage data trends to anticipate maintenance needs before failures occur. Learn more about predictive maintenance and CAN bus.

Open-source and customizable OBD2 data logging systems for data control and integration.

4. Data Control and Custom Integration

Unlike closed, proprietary systems, an OBD2 WiFi logger gives you complete ownership and control over your data. You record raw time-series data that can be extracted via an SD card or wirelessly uploaded to your own server. This open approach facilitates seamless custom integration through open APIs. This is particularly beneficial for developers and organizations that require tailored solutions and want to build their own “OBD2 data logger app” or integrate the data into existing platforms.

Which of these benefits aligns with your OBD2 logging goals? Contact us for a free consultation!

Introducing the CANedge OBD2 Data Logger

The CANedge CAN bus data logger series is engineered for versatility and performance, offering optional GPS/IMU, WiFi, and 3G/4G connectivity. This makes it an excellent foundation for sophisticated OBD2 fleet telematics solutions.

Plug & Play CAN Logger: Easy setup and standalone operation for vehicle data logging.

PLUG & PLAY: Start logging data immediately, right out of the box. The CANedge operates in standalone mode, effortlessly connecting your vehicle to your server.

Professional CAN Logger Specifications: High performance and robust data capture.

PRO SPECS: Features include extractable 8-32 GB SD card storage, dual CAN/LIN channels, CAN FD support, zero data loss, 50 Î¼s RTC timestamping, error frame detection, and MF4 logging format.

Compact and Rugged CAN Logger: Small form factor with robust enclosure for demanding environments.

COMPACT: Measuring just 8 x 5 x 2 cm and built with a rugged aluminum enclosure, the CANedge is designed for discreet and durable deployment. It also includes 5+ LEDs for status indication and configurable 5V power output on CH2.

Secure Vehicle Telematics: WiFi and LTE connectivity for wireless data transfer and security features.

WIFI/LTE: Seamlessly push data via WiFi or 3G/4G to your server. Benefit from end-to-end security and Over-The-Air (OTA) updates for continuous improvement.

GNSS + 3D IMU Data: Integrated GPS/IMU for enhanced location and motion data.

GNSS + 3D IMU: The built-in GPS/IMU provides 3x accuracy through sensor fusion, capturing position, speed, distance, acceleration, orientation, and more.

Open Source Software & API: Free tools and APIs for data processing and integration.

INTEROPERABLE: Utilize free and open-source software/APIs, supporting MF4 to ASC/CSV conversion, DBC integration, Python libraries, and customizable dashboards.

Learn More About CANedge

Software Example: OBD2 Dashboard for Real-Time Car Data Visualization

With CANedge, setting up free, custom browser dashboards to visualize your OBD2 data and configure alerts is incredibly easy. This effectively acts as your “OBD2 data logger app” interface, accessible from any web browser.

For even richer insights, combine your OBD2 data with GPS/IMU data using a CANedge with GNSS/IMU. This allows you to overlay vehicle location, speed, and motion data with engine parameters.

Explore the interactive online playground or delve deeper into our dashboard introduction:

Online Playground
Dashboards Introduction

Get the ‘OBD2 Data Pack’ for Hands-On Experience

Ready to work with real OBD2 data? Download our comprehensive ‘data pack,’ which includes:

Our OBD2 DBC file: Essential for decoding OBD2 data.
25+ Car DBCs (Reverse Engineered): Expand your decoding capabilities.
100+ MB of Data from 10+ Cars: Dive into real-world OBD2 data samples.

Download OBD2 Data Pack Now

Download our free OBD2 data pack to start experimenting with real vehicle data.

Practical Use Case Examples

Let’s explore some real-world scenarios where the CANedge OBD2 data logger proves its value.

OEM Field Testing of Vehicle Parts

Do you need to log CAN/OBD2 data from vehicles in real-world operating conditions?

OEMs often require late-stage field testing of prototype equipment. This necessitates collecting OBD2 and CAN data from multiple vehicles over extended periods, such as months. The CANedge1 is perfectly suited for this purpose due to its compact size, plug-and-play simplicity, and easy pre-configuration. Data can be collected periodically and analyzed using industry-standard CAN tools or the free asammdf GUI/API.

Explore CANedge1 for OEM Testing

OEM field testing of prototype vehicle equipment using OBD2 data loggers.

OBD2 data logger applications in vehicle fleet management and telematics.

Vehicle Telematics (OBD2 + GNSS/IMU + 3G/4G)

Are you looking to implement OBD2 telematics for on-road vehicle fleets?

The CANedge3 excels in OBD2 telematics applications. It can wirelessly upload recorded OBD2 data via 3G/4G using your own SIM card, enabling near real-time data transfer from vehicles to your cloud server. The open APIs, including OBD2 DBC decoding support, facilitate automated data processing, while over-the-air updates ensure your CANedge3 devices remain up-to-date. Furthermore, the integrated GPS/IMU in CANedge3 adds valuable location, speed, trip distance, and motion data to your telematics solution.

Discover CANedge3 for Vehicle Telematics

Case Study: OBD2/CAN Telematics in Action

Volkswagen case study highlighting the use of CANedge2 for OBD2 and CAN data logging.

Learn how Volkswagen leverages the CANedge2 to log both OBD2 and raw CAN data to an SD card, and automatically push this data to their self-hosted server for in-depth analysis.

“The CANedge2 enabled us to get up and running quickly with robust configuration options, and the support was outstanding!”

Read the Volkswagen Case Study
Explore 100+ Case Studies

Illustration of Volkswagen’s OBD2 telematics system using a WiFi data logger.

Professional OBD2 Data Logger: Example data visualization showing RPM, speed, and throttle.

Sample OBD2 Data from an Audi A4

Want to see OBD2 data in action? We provide downloadable OBD2 samples recorded with CANedge from an Audi A4.

You can also download our free open-source OBD2 software and experiment with decoding raw OBD2 data yourself.

Raw OBD2 Data
Decoded OBD2 Data (Google Sheet)
Free OBD2 Software

Frequently Asked Questions (FAQ)

The OBD2 protocol (SAE J1979) defines a standardized set of vehicle parameters for logging. However, the specific OBD2 data supported varies between car models, with older cars often offering fewer parameters.

Here are some common standard OBD2 parameters that are frequently available:

Fuel system status
Engine load
Coolant temperature
Fuel trim
Fuel pressure
Intake manifold pressure
Engine RPM
Vehicle speed
Intake air temperature
MAF air flow rate
Throttle position
Air status
Oxygen sensor status
Runtime since engine start
Distance with MIL on
Fuel tank level input
System vapor pressure
Absolute load value
Hybrid battery pack life
Engine oil temperature
Engine fuel rate
Torque
VIN (Vehicle Identification Number)
Various DTCs (Diagnostic Trouble Codes)

For in-depth details, consult the OBD2 PID Wiki page or the official SAE J1979 standard.

To translate raw OBD2 data from a CANedge logger into physical values (like km/h, RPM), you need a database of decoding rules – an OBD2 DBC file – and compatible OBD2 software.

We offer a 100% free OBD2 DBC file that includes most standardized Mode 01 (Service 01) OBD2 PID decoding rules, based on resources like the OBD2 PID Wiki page.

This OBD2 DBC file utilizes extended multiplexing for efficient OBD2 decoding. For a deeper understanding, see our DBC introduction and our OBD2 primer, where we explain how to interpret raw CAN frames containing OBD2 responses.

Load your raw OBD2 data and the OBD2 DBC file into our free software tools, such as asammdf or our OBD2 dashboard integrations, to visualize decoded OBD2 parameters like Speed, Engine Speed, MAF, and Fuel Level.

A key advantage of this approach is the ability to easily customize the OBD2 DBC file to incorporate proprietary OBD2 PIDs. You can also combine the OBD2 DBC with proprietary CAN DBC files for comprehensive CAN and OBD2 car data logging.

What is UDS (Unified Diagnostic Services)?

Unified Diagnostic Services (UDS) protocol (ISO 14229-1) is used for communication with automotive ECUs (Electronic Control Units). While OBD2 is designed for on-board diagnostics during vehicle operation, UDS is typically used for off-board diagnostics when the vehicle is stationary. UDS allows diagnostic tools to send request messages over the CAN bus to retrieve information from specific ECUs.

How to Make UDS Requests over ISO-TP (ISO 15765-2)

Requesting OBD2 PIDs is relatively simple, involving single CAN frame requests and responses. UDS requests, however, may require transport protocol handling. For example, using UDS service 0x22 (request data by identifier) involves a more complex communication flow:

Request Frame: The ‘UDS data logger’ sends a CAN frame specifying the Service ID (SID) and Data Identifier (DID).
First Frame: The car ECU responds with a CAN frame containing the SID, DID, total message length, and initial data bytes.
Flow Control Frame: The UDS logger acknowledges the first frame with a flow control frame.
Consecutive Frames: The ECU transmits subsequent CAN frames carrying the remaining message payload.

Logging UDS data requires a UDS tool capable of sending custom CAN frames and flow control frames. Software tools must also be able to reassemble multi-frame UDS responses to extract and decode the data payload.

UDS and OBD2 Extended PIDs for Enhanced Car Data Logging

UDS Service IDs (SIDs) and Data Identifiers (DIDs) are sometimes combined into ‘extended OBD2 PIDs,’ such as 0x220101. Service 0x22 UDS requests can access car data beyond standard OBD2 PIDs. For instance, some electric vehicles provide State of Charge (SoC%) information via UDS service 0x22.

CANedge as a UDS Data Logger

CANedge can be configured to send UDS requests. This involves sending a request frame followed by a flow control frame within a specified time. This triggers the sequence of UDS responses. Log files containing UDS responses can be analyzed using tools like CANalyzer (by converting MF4 data to Vector ASC) or processed using our free Python CAN bus API for applications like Grafana UDS dashboards. Our GitHub API examples include UDS response data and a UDS DBC file for decoding State of Charge (SoC%) from a Hyundai Kona EV. For more information, see our EV data logger article or contact us.

Is My Car OBD2 Compatible?

Most likely, yes. OBD2 has been mandatory in the USA since 1996 and in the EU (as EOBD) since 2003 for cars and light trucks.

However, even with OBD2 support, the available data parameters vary by vehicle model and year. Older cars often have limited support for real-time parameters like speed and RPM. Some manufacturers are also restricting OBD2 data access for greater control over vehicle data. While CAN bus is the dominant signal protocol for OBD2, older US cars (pre-2008) and some EU brands might use alternative protocols.

Quick Check: Inspect your car’s OBD2 connector. For CAN logging, ensure “metal pins” are present in pins 6 (CAN High) and 14 (CAN Low) – see our OBD2 connector illustration (red pins). If unsure, send us a picture for verification.

There are five OBD2 signal protocols:

ISO 15765 (CAN): Predominant, required in US vehicles since 2008.
SAE J1850 (PWM): Ford Motor Company standard.
SAE J1850 (VPW): General Motors standard.
ISO 9141-2: Used by Chrysler and some EU/Asian vehicles.
ISO 14230 (KWP2000): Primarily used by EU manufacturers.

CANedge/CLX000 supports CAN-based OBD2. Contact us if you have doubts about compatibility.

For a preliminary protocol check, use this resource: OBD2 compatibility (cars). Also, review our simple OBD2 introduction.

You can also use an OBD2 logger to check supported Mode 01 OBD2 parameter IDs in your car. Request ‘Supported PIDs’ parameters (IDs 00, 20, 40, 60, 80, A0, C0) and analyze the response data bytes bit-by-bit (refer to the Wikipedia OBD2 PID article).

OBD2 vs. J1939 Data Logging

OBD2 logging is generally for cars and light trucks. For heavy-duty vehicles (trucks, tractors, excavators), J1939 data logging is typically required. J1939 is a standardized protocol in heavy-duty vehicles, allowing cross-brand data decoding, similar to OBD2. A J1939 DBC file is needed for decoding J1939 data, and CANedge/CLX000 can be used as J1939 data loggers.

Which OBD2 Data Logger is Right for Me?

Both CANedge and CLX000 series data loggers are suitable for OBD2 data logging.

For SD card logging, the CANedge series is recommended as it’s optimized for logging. For auto-uploading log files to your server, the CANedge2 is ideal, especially for OBD2 telematics and OBD2 dashboards.

If real-time OBD2 data streaming via USB to a PC is also needed, the CLX000 series, such as the CL2000, is recommended.

Can I Stream OBD2 Data in Real-Time?

Yes, the CLX000 series enables real-time streaming of raw CAN and OBD2 data via USB. See our OBD2 streaming introduction.

Raw CAN Data vs. OBD2 Data Logging

Connecting a CAN logger like CANedge to your OBD2 port will, by default, record raw CAN bus data in most cars. This raw data is used for internal vehicle communication.

OEMs may want to log raw CAN data and will have CAN databases (DBC files) for decoding it. For non-OEM users, decoding raw CAN data involves car hacking and reverse engineering. Partial databases may be found online from projects like opendbc.

For most users, OBD2 protocol is the primary method for data collection. OBD2 communication over CAN bus is “on-request.” To log OBD2 data, you send custom CAN frames requesting specific data, and the car responds if the OBD2 PID is supported.

Types of OBD2 Devices

The OBD2 device market is vast. Here’s a breakdown of common types:

OBD2 Scanners: Used by mechanics for diagnostics, reading and clearing Diagnostic Trouble Codes (DTCs). Includes OBD2 Bluetooth and WiFi scanners for smartphone access.
OBD2 Dongles: Small, low-cost Bluetooth OBD2 readers for consumer use, typically using ELM327 microcontrollers. Offer limited flexibility, primarily for real-time data display via smartphone apps.
OBD2 Data Loggers: Record OBD2 time-series data to SD cards in standalone mode. CANedge1 is an example.
OBD2 WiFi/LTE Loggers: OBD2 data loggers with WiFi or 3G/4G for data transfer to servers, enabling OBD2 telematics and OBD2 dashboards. CANedge2/CANedge3 are examples.
OBD2 Interfaces: CAN interfaces that stream OBD2 data to a PC via USB, like CLX000 with USB streaming of OBD2 data via SavvyCAN.

Will the OBD2 Logger Drain My Car Battery?

In most cases, no. CANedge usually powers on/off with the ignition via the OBD2 connector’s IGN power supply, preventing battery drain when the car is off.

However, in some vehicles, the OBD2 connector is directly battery-powered, so CANedge might remain on. The power draw is minimal (<2W).

To check, observe the LEDs after turning off your car for 15-20 minutes. If LEDs are off, CANedge is off. If it stays on and you anticipate long periods of vehicle inactivity, disconnect the device or configure CANedge to start/stop based on CAN data patterns related to ignition status. Alternatively, use a DB9-DC splitter cable and DC-cigarette receptacle adapter to power CANedge via the cigarette lighter, which is typically ignition-linked. See CANedge Docs for details.

Does CANedge Record GPS Data from My Car?

Your car might have built-in GPS, but accessing it via OBD2 or proprietary CAN data is often not feasible. We recommend using a CANedge with GNSS/IMU to record synchronized GNSS/IMU data alongside CAN/OBD2 data.

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