What does code U0304 mean?

Q: What does code U0304 mean?

Software Incompatibility with Gear Shift Control Module. U0304 is a network communication code indicating that a control module on the vehicle's data bus has detected a software incompatibility with the gear shift control module. The computer has compared software version or configuration data and found that the gear shift module's programming does not match what the rest of the vehicle expects, so it flags the mismatch rather than a hardware failure.

DTC codes / U03xx · Software and configuration mismatches / U0304

U0304Software Incompatibility with Gear Shift Control Module

U0304 is a network communication code indicating that a control module on the vehicle's data bus has detected a software incompatibility with the gear shift control module. The computer has compared software version or configuration data and found that the gear shift module's programming does not match what the rest of the vehicle expects, so it flags the mismatch rather than a hardware failure.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaSoftware and configuration mismatches

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.