What is OBD2 (On Board Diagnostics)?
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CAN bus (ISO 11898) is a vehicle bus standard that enables robust, efficient and decentralized communication between electronic control units. It is today the de facto standard in practically all automotives (cars, trucks, tractors, buses, motorcycles, ...), maritime vessels, aerospace applications and industrial machinery.

In short, OBD2 is your vehicle's builtin selfdiagnostic system. It enables access to vehicle Diagnostic Trouble Codes (DTC) to e.g. enable mechanics to use OBD2 scanners to diagnose and resolve issues (as indicated by the Malfunction Indicator Light, or MIL). In addition, the OBD2 protocol provides access to a range of realtime parameters such as speed, RPM, throttle position and more across different car brands. This makes it key to various use cases, such as car fleet management, automotive development & diagnostics for OEMs, fuel optimization and more.

Want all our CAN intros in one 100+ page PDF? Then get your free 'Ultimate Guide' now:
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In this "v2.0" updated video tutorial we explain the OBD2 standard:

00:00 Introduction
00:25 Basics of OBD2
01:11 The OBD2 connector (pinouts, type A & B)
01:52 OBD2 vs CAN bus
02:38 The history of OBD2
04:00 The future of OBD2 (OBD3, data access, electric vehicles)
04:59 How to record OBD2 data in practice
06:00 The OBD2 frame message structure (incl. OBD2 PIDs)
08:49 Example: OBD2 message request/response
09:23 OBD2 DBC file and decoding of OBD2 PIDs
09:40 OBD2 data logging use cases


This video is part of our extremely popular series of CAN protocol intros. Below you'll find links for our full playlist, as well as the more detailed articles.

Playlist for all intro videos:    • CAN Bus Explained  A Simple Intro [v...  

1) CAN bus: https://www.csselectronics.com/pages/...
2) OBD2: https://www.csselectronics.com/pages/...
3) J1939: https://www.csselectronics.com/pages/...
4) CANopen: https://www.csselectronics.com/pages/...
5) CAN FD: https://www.csselectronics.com/pages/...
6) LIN bus: https://www.csselectronics.com/pages/...
7) DBC files: https://www.csselectronics.com/pages/...



If you're interested in learning more about logging CAN bus data, we recommend that you check out our below intros to our CANedge CAN bus data loggers, our CANmod sensortoCAN modules and our free software/API tools:

Learn about CAN bus data logging:
   • CANedge: CAN Bus Data Loggers  Intro...  

Learn about the CANedge and CANmod:
https://www.csselectronics.com/pages/...

1) CANedge1: https://www.csselectronics.com/produc...
2) CANedge2: https://www.csselectronics.com/produc...
3) CANedge3: https://www.csselectronics.com/produc...
4) CANmod.gps: https://www.csselectronics.com/produc...
5) CANmod.temp: https://www.csselectronics.com/produc...
6) CANmod.input: https://www.csselectronics.com/produc...

See also our intros to practical OBD2 logging & software:

1) OBD2 data logger: https://www.csselectronics.com/pages/...
2) OBD2 dashboards: https://www.csselectronics.com/pages/...
3) asammdf GUI: https://www.csselectronics.com/pages/...
4) CAN bus reverse engineering: https://www.csselectronics.com/pages/...

For more tutorials, see our overview: https://www.csselectronics.com/pages/...

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At CSS Electronics we specialize in simpletouse, pro specs and interoperable CAN bus data loggers like the CANedge and CLX000 series. The devices let you record raw data from e.g. cars, trucks, industrial machinery and other CAN based applications onto an 832 GB SD card. The devices are interoperable, meaning you can process the data in your favorite existing software or use our 100% free and open source software/API tools.

Website: https://www.csselectronics.com
Products: https://www.csselectronics.com/pages/...
Software: https://www.csselectronics.com/pages/...
Case studies: https://www.csselectronics.com/pages/...

We offer 100% free technical sparring contact us:
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