OBD2 Protocols Explained – How Your Car Communicates Diagnostic Data
- Khadija
- 6 days ago
- 1 min read
Every OBD2 scanner relies on communication protocols to talk to your vehicle. These protocols define how data is transmitted between the car’s ECU and diagnostic tools. Understanding OBD2 protocols helps technicians and car owners choose compatible scanners and diagnose vehicles more accurately.
What Are OBD2 Protocols?
OBD2 protocols are standardized communication languages that vehicles use to share diagnostic information. Different manufacturers adopted different protocols before global standardization.
Common OBD2 Protocols
CAN (Controller Area Network) – Used by most vehicles after 2008
ISO 9141-2 – Common in older European vehicles
ISO 14230 (KWP2000) – Used by many Asian & European cars
SAE J1850 PWM/VPW – Used by older Ford and GM vehicles
Why Protocol Compatibility Matters
If your scanner does not support your vehicle’s protocol, diagnostics will fail. Professional OBD2 scanners automatically detect protocols, ensuring smooth communication.
Conclusion
Understanding OBD2 protocols improves diagnostic accuracy and scanner compatibility.
