OBD-II code · Network
U0404 Invalid Data Received from Gear Shift Control Module
The Gear Shift Control Module is present on the data bus but the values it reports are implausible — out of range, frozen, or failing the checksum or rolling-count check. The receiving modules reject the data. Shift-by-wire gear selection may be wrong or blocked. Causes include a faulty sensor feeding the module, internal computation errors, a software or calibration mismatch after a repair, or bus interference corrupting the frames.
Is it safe to drive with U0404?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- PossibleShift module internal fault
- PossibleCAN corruption causing checksum errors
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Gear Shift Module, Can Bus Wiring
Related codes
- U0401Invalid Data Received from ECM/PCM
- U0402Invalid Data Received from TCM
- U0403Invalid Data Received from Transfer Case Control Module
- U0405Invalid Data Received from Cruise Control Module
- U0406Invalid Data Received from Cruise Control Front Distance Range Sensor
- U0407Invalid Data Received from Steering Angle Sensor Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.