Error code
OBD2 U0304
OBD2U0304
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Software Incompatibility with Gear Shift Control Module.
Severity
moderateCan drive but may experience shifting issues.
Summary
U0304 indicates software incompatibility related to the gear shift control module, which can affect transmission operation.
Common Causes
- Software update or installation error
- Faulty gear shift control module
Fixes
- Reflash the ECU with compatible software or replace the gear shift control module.
FAQ
What causes U0304?
U0304 is typically caused by a mismatch between the software version and the hardware of the gear shift control module.
How do I fix it?
Fixing U0304 usually involves reflashing the ECU with compatible software or replacing the faulty gear shift 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
- 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
- U0309Software Incompatibility with Alternative Fuel Control Module
- U0310Software Incompatibility with Fuel Pump Control Module
- U0311Software Incompatibility with Drive Motor Control Module
- U0312Software Incompatibility with Battery Energy Control Module A