ChassisC0091
CautionSeverity: Caution - get it checked when you can
Brake switch circuit - open during ABS stop
Key terms: ABS: anti-lock braking, which stops the wheels locking · Stability control: helps stop the car skidding · Wheel speed sensor: measures how fast each wheel turns
1What it means in plain English
A chassis system has a fault, usually ABS, traction control or stability control, but some makes use this range for airbags, electric power steering or park brakes.
2Common causes
- Faulty wheel speed sensor
- Damaged sensor ring or wiring
- Faulty ABS module
- Low brake fluid
- Wheel bearing damage
3Can I drive?
The braking system may be affected. Have it checked promptly; if the pedal feels abnormal, the car pulls when braking, or a brake warning light is on, stop safely.
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 8
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | C0091 | No description available | Chassis |
| BYD | C0091 | Brake pedal not applied with decel Brand | Chassis |
| Chery | C0091 | Brake pedal not applied with decel Brand | Chassis |
| EOBD | C0091 | 4WD/AWD jõuülekandeseadme asenditundja 'A' Brand | Chassis |
| Geely | C0091 | Brake Signal Undetected In Deceleration Brand | Chassis |
| GM | C0091 | Brake switch circuit - open during ABS stop Brand | Chassis |
| Holden | C0091 | DTC or C0092 set in current or previous ignition cycle Brand | Chassis |
| Saab | C0091 | Brake Switch Circuit - Open During ABS Stop Brand | Chassis |
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 1
These 7-character codes are manufacturer-specific variants of C0091 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | C009100 | Faulty rear RH shock absorber damper actuator(CDC) Brand | Chassis |
6Related codes
Browse Cxxx codes or C009xx codes.