PowertrainP0A91
CautionSeverity: Caution - get it checked when you can
Drive Motor B 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
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
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 23
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0A91 | No description available | Powertrain |
| BAIC Motor | P0A91 | Drive Motor B Performance Brand | Powertrain |
| BYD | P0A91 | Drive Motor B Performance Brand | Powertrain |
| Chery | P0A91 | ISG motor speed too high Brand | Powertrain |
| Daewoo | P0A91 | Drive Motor B Performance Brand | Powertrain |
| DFFS | P0A91 | Drive Motor B Performance Brand | Powertrain |
| DFFX | P0A91 | Drive Motor B Performance Brand | Powertrain |
| DFXK | P0A91 | Drive Motor B Performance Brand | Powertrain |
| EOBD | P0A91 | Drivmotor 'B' ytelse Brand | Powertrain |
| Geely | P0A91 | Drive Motor B Performance Brand | Powertrain |
| GM | P0A91 | Drive Motor B Performance Brand | Powertrain |
| Great Wall | P0A91 | Drive Motor B Performance Brand | Powertrain |
| Hafei | P0A91 | Drive Motor B Performance Brand | Powertrain |
| Hyundai | P0A91 | No description available | Powertrain |
| Isuzu | P0A91 | No description available | Powertrain |
| Land Rover | P0A91 | Drive motor B- performance Brand | Powertrain |
| Mitsubishi | P0A91 | Rear motor system fail Brand | Powertrain |
| Peugeot | P0A91 | No description available | Powertrain |
| Proton | P0A91 | Rear motor system fail Brand | Powertrain |
| Saab | P0A91 | Drive Motor B Performance Brand | Powertrain |
| MG (SAIC) | P0A91 | Drive Motor B Performance Brand | Powertrain |
| Suzuki | P0A91 | No description available | Powertrain |
| Toyota | P0A91 | Drive Motor B 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 22
These 7-character codes are manufacturer-specific variants of P0A91 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P0A9100 | Die Elektrische Maschine B hat Funktionsstörung Brand | Powertrain |
| Mercedes-Benz | P0A9104 | Electric Machine Positive Demagnetization Fault Detected Using Integral-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9109 | Electric Machine Positive Demagnetization Fault Detected Using Integral-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9117 | SS unsafe HV request (L2) Brand | Powertrain |
| Mercedes-Benz | P0A9118 | Electric Machine Positive Sensolress Low Speed Torque Plausibility Fault Detected Using Integral-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9119 | SS unsafe Torque request (L2) Brand | Powertrain |
| Mercedes-Benz | P0A911D | Electric Machine Positve d-Axis Current Fault Brand | Powertrain |
| Mercedes-Benz | P0A9129 | Electric Machine Negative Sensolress Low Speed Torque Plausibility Fault Detected Using Counter-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A912F | Electric Machine Negative Sensolress Low Speed Torque Plausibility Fault Detected Using Integral-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9132 | Electric Machine Negative Commanded Torque Plausibility Fault Detected Using Counter-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9133 | Electric Machine Positive Commanded Torque Plausibility Fault Detected Using Counter-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9134 | Electric Machine Positive Commanded Torque Plausibility Fault Detected Using Integral-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9135 | Electric Machine Negative Commanded Torque Plausibility Fault Detected Using Integral-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9154 | E-machine offset learning not successfully executed. Brand | Powertrain |
| Mercedes-Benz | P0A9156 | E-machine offset learning value is out of range. Brand | Powertrain |
| Mercedes-Benz | P0A9184 | No description available | Powertrain |
| Mercedes-Benz | P0A9185 | Electric Machine Positive Demagnetization Fault Detected Using Counter-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9191 | Motor Integrator at Limit Fault Brand | Powertrain |
| Mercedes-Benz | P0A9192 | Electric Machine Positive Demagnetization Fault Detected Using Counter-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9195 | Electric Machine Negative Demagnetization Detected Using Counter-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9196 | Electric Machine Negative Demagnetization Detected Using Integral-Based Method Brand | Powertrain |
| Mercedes-Benz | P0A9198 | Electrical Machine Over Temperature Brand | Powertrain |
6Related codes
Browse Pxxx codes or P0A9xx codes.