PowertrainP085D
CautionSeverity: Caution - get it checked when you can
Gear shift control module 'A' performance
Key terms: Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions
1What it means in plain English
This range normally covers the transmission control system, but some manufacturers use P07-P09 codes for unrelated functions (fuel pump control, air-mix motors, lighting or windows). Check the description before assuming it is a transmission fault.
2Common causes
- Low or dirty transmission fluid
- Faulty shift solenoid
- Faulty speed sensor
- Wiring or connector fault
- Internal transmission wear
3Can I drive?
If the transmission slips, jerks, will not shift, or a transmission temperature warning is on, stop driving and let it cool: continuing can cause expensive damage. If the code names a different system (for example the fuel pump), treat it on its own terms; a fuel-pump control failure can stall the car, so have it checked before driving further. Otherwise drive gently to a workshop.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 20
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P085D | Engine Oil Quality Sensor. Operation Failure Brand | Powertrain |
| BAIC Motor | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| BYD | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| Chery | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| DFFS | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| DFFX | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| DFXK | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| EOBD | P085D | Girskiftkontrollmodul 'A' ytelse Brand | Powertrain |
| Geely | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| GM | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| Great Wall | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| Hafei | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| Hyundai | P085D | No description available | Powertrain |
| Isuzu | P085D | No description available | Powertrain |
| Land Rover | P085D | No description available | Powertrain |
| Peugeot | P085D | No description available | Powertrain |
| Saab | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| MG (SAIC) | P085D | Gear Shift Control Module 'A' Performance Brand | Powertrain |
| Suzuki | P085D | No description available | Powertrain |
| Toyota | P085D | Gear shift control module 'A' performance Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 3
These 7-character codes are manufacturer-specific variants of P085D and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P085D00 | Control unit 'Rear axle differential' has a malfunction. Brand | Powertrain |
| Mercedes-Benz | P085D02 | Control unit 'Rear axle differential' has a malfunction. There is a general signal fault. Brand | Powertrain |
| Mercedes-Benz | P085D08 | Control unit 'Rear axle differential' has a malfunction. There is a signal fault or the message is faulty. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P085xx codes.