Network
generic / SAE
U0291
Lost Communication With Gear Shift Control Module B
The vehicle bus reports loss of communication with gear shift control module B. Shift-by-wire requests for park/reverse/drive coordinated through this node are no longer answered.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number2 / 91
Possible causes
- Bus wiring open or shorted high
- Module without power or ground medium
- Module failed medium
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–2000 €
- Estimated time: 1–4 h
- Component: gear shift control module b
- Component: vehicle bus wiring
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012