ChassisC1231
CautionSeverity: Caution - get it checked when you can
Control unit internal fault
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?
If the code names an airbag or SRS system, the airbag may not deploy in a crash: have it diagnosed promptly. If it names electric power steering, the assist may fail and the steering can become heavy: stop safely if that happens. If it names the brakes or park brake, have it checked before driving when braking feels abnormal. Otherwise ABS and stability control may be disabled: drive carefully, especially in wet conditions, and have it checked soon.
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 25
| Brand | Code | Description | System |
|---|---|---|---|
| BAIC Motor | C1231 | ECU Internal fault Brand | Chassis |
| BYD | C1231 | FR outlet valve Brand | Chassis |
| Chery | C1231 | FR outlet valve Brand | Chassis |
| Daewoo | C1231 | No description available | Chassis |
| Daihatsu | C1231 | Steering angle sensor system fault Brand | Chassis |
| DFFS | C1231 | ECU exception Brand | Chassis |
| DFFX | C1231 | FR outlet valve Brand | Chassis |
| Geely | C1231 | FR outlet valve Brand | Chassis |
| GM | C1231 | No description available | Chassis |
| Great Wall | C1231 | FR outlet valve Brand | Chassis |
| Hafei | C1231 | FR outlet valve Brand | Chassis |
| Holden | C1231 | Right Rear Differential Clutch System Performance Brand | Chassis |
| Maserati | C1231 | No description available | Chassis |
| Mitsubishi | C1231 | FR outlet valve Brand | Chassis |
| Opel | C1231 | No description available | Chassis |
| Perodua | C1231 | Steering angle sensor system fault Brand | Chassis |
| Peugeot | C1231 | No description available | Chassis |
| Proton | C1231 | FR outlet valve Brand | Chassis |
| Saab | C1231 | No description available | Chassis |
| MG (SAIC) | C1231 | Front rear outlet valve malFunction Brand | Chassis |
| Smart | C1231 | No description available | Chassis |
| Subaru | C1231 | No description available | Chassis |
| Suzuki | C1231 | Transfer shift actuator motor circuit open Brand | Chassis |
| Toyota | C1231 | Control unit internal fault Brand | Chassis |
| Volkswagen | C1231 | Seat tilt adjustment sensor - driver's 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.
5Related codes
Browse Cxxx codes or C123xx codes.