P085EGear Shift Control Module B Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Gear shift control modules A and B are selector modules of shift-by-wire systems, such as Audi's selector lever J587 or Stellantis' rotary shift module. The codes cover a dedicated link to the gearbox module and the module's plausibility. If the selected range cannot be transferred reliably, the gearbox holds its range, goes to P at standstill or into limp mode. Modules on CAN report lost communication as U0103 or invalid data as U0404 instead; GM uses its own codes. P085E is the plausibility fault of module B, a second module or channel of the shift-by-wire system: communication works, but data are implausible or the module reports an internal fault. No maker documents it; Audi's P085D shows the same logic for module A.
- What you may notice
- Selector or gearbox warning in the instrument cluster
- Range cannot be selected or only with delay, car stays in P/N
- Gearbox limp mode
- Likely causes
- PossibleSelector module software
- PossibleModule B faulty
- PossibleSupply voltage
- RareConnector or wiring
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.