Error code
OBD2 U0309
OBD2U0309
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Software Incompatibility with Alternative Fuel Control Module.
Severity
moderateCan drive, but performance issues may occur.
Summary
U0309 indicates software incompatibility related to the alternative fuel control module, which is part of the engine's management system.
Common Causes
- Software update or installation that does not match the vehicle's specifications
- Alternative fuel control module malfunction
Fixes
- Update or reinstall compatible software for the alternative fuel control module.
FAQ
What does U0309 mean?
U0309 indicates a software incompatibility issue with the alternative fuel control module.
How do I fix U0309?
Fixing U0309 typically involves updating or reinstalling compatible software for the alternative fuel control module.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- U0300Internal Control Module Software Incompatibility
- U0301Software Incompatibility with ECM/PCM
- U0302Software Incompatibility with Transmission Control Module
- U0303Software Incompatibility with Transfer Case Control Module
- U0304Software Incompatibility with Gear Shift Control Module
- U0305Software Incompatibility with Cruise Control Module
- U0306Software Incompatibility with Fuel Injector Control Module
- U0307Software Incompatibility with Glow Plug Control Module
- U0308Software Incompatibility with Throttle Actuator Control Module
- U0310Software Incompatibility with Fuel Pump Control Module
- U0311Software Incompatibility with Drive Motor Control Module
- U0312Software Incompatibility with Battery Energy Control Module A