U0302Software Incompatibility With Transmission Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U0302 points to a software or calibration conflict between the transmission controller and its partners. Volkswagen's 2014 Touareg and CC emission specification books show a typical trigger: the engine controller sets U0302 when it is coded for the wrong gearbox type, for instance it receives automatic transmission frames while coded for a manual, or is coded automatic in a manual car. CARB 1968.2 names this very design, a control unit holding manual and automatic variants that lights the MIL when the wrong one is active. GM's 2011 Saab 9-5 treats U0302 as a configuration fault checked at 9-16 V without wiring tests, and the Volkswagen tip 01-18-10TT names it among codes after an engine controller swap. U0101 stands for lost contact, U0402 for invalid data. Expect a MIL and possibly gearbox limp mode.
- What you may notice
- Check engine light on
- Harsh or missing shifts, transmission in limp mode
- Code appears after engine or transmission controller work
- Likely causes
- LikelyEngine controller coded for the wrong transmission type
- PossibleTCM or ECM replaced or updated without matching the partner
- RareProgramming of the TCM aborted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.