P085E code meaning
Gear Shift Control Module B Performance
Powertrain system Generic code P08xx codes Check engine light
What P085E means
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.
P085E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P085E
- Selector or gearbox warning in the instrument cluster
- Range cannot be selected or only with delay, car stays in P/N
- Gearbox limp mode
Common causes of P085E
- PossibleSelector module software
- PossibleModule B faulty
- PossibleSupply voltage
- Less likelyConnector or wiring
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Electronic shift moduleTransmission control moduleSerial data lineModule wiring
What each part of P085E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| 5E | The exact fault in that area. |
What to do next
- Note P085E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P085E
What does P085E mean?
P085E means "Gear Shift Control Module B Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P085E?
Drive gently and only to a workshop. With P085E the car can go into limp mode (reduced power) to protect itself.
Will P085E fail an emissions test?
Yes, it can. P085E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P085E to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P085E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.