ChassisC0040
CautionSeverity: Caution - get it checked when you can
Right Front Wheel Speed Sensor Circuit
Key terms: ABS: anti-lock braking, which stops the wheels locking · Stability control: helps stop the car skidding · Tone wheel: a toothed ring read by the wheel speed sensor · Wheel speed sensor: measures how fast each wheel turns · SAE J2012: the standard generic code list
1What it means in plain English
The right front wheel speed sensor signal is missing or unreliable. ABS and stability control may stop working.
2Common causes
- Faulty wheel speed sensor
- Damaged sensor ring or tone wheel
- Damaged wiring or connector
- Metal debris on the sensor tip
- Wheel bearing damage
3Can I drive?
Normal braking still works, but ABS and stability control may not. Drive carefully, especially in wet or slippery 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 26
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | C0040 | Right Front Wheel Speed Sensor Circuit SAE | Chassis |
| BAIC Motor | C0040 | Brake Pedal Switch A Brand | Chassis |
| BYD | C0040 | Brake Pedal Switch A Brand | Chassis |
| Chery | C0040 | Brake Pedal Switch A Brand | Chassis |
| Daewoo | C0040 | Brake Pedal Switch A Brand | Chassis |
| DFFS | C0040 | Brake Pedal Switch A Brand | Chassis |
| DFFX | C0040 | Brake Pedal Switch A Brand | Chassis |
| DFXK | C0040 | Brake Pedal Switch A Brand | Chassis |
| EOBD | C0040 | Suis pedal brek A Brand | Chassis |
| Geely | C0040 | Brake Pedal Switch A Brand | Chassis |
| GM | C0040 | Right Front Wheel Speed Sensor Circuit Brand | Chassis |
| Great Wall | C0040 | Brake Pedal Switch A Brand | Chassis |
| Hafei | C0040 | Brake Pedal Switch A Brand | Chassis |
| Holden | C0040 | Brake Pedal Switch Brand | Chassis |
| Honda | C0040 | Right Front Wheel Speed Sensor Circuit SAE | Chassis |
| Hyundai | C0040 | Right Front Wheel Speed Sensor Circuit SAE | Chassis |
| Isuzu | C0040 | Right Front Wheel Speed Sensor Circuit SAE | Chassis |
| Land Rover | C0040 | Brake pedal switch A Brand | Chassis |
| Maserati | C0040 | Brake Pedal Switch Signal Compare Failure Brand | Chassis |
| Opel | C0040 | Right Front Wheel Speed Sensor Circuit Brand | Chassis |
| Peugeot | C0040 | Right Front Wheel Speed Sensor Circuit SAE | Chassis |
| Proton | C0040 | Right Front Wheel Speed Sensor Circuit SAE | Chassis |
| Saab | C0040 | Right Front Wheel Speed Sensor Circuit Brand | Chassis |
| MG (SAIC) | C0040 | Brake Switch Fault Brand | Chassis |
| Tata | C0040 | Right Front Wheel Speed Sensor Circuit SAE | Chassis |
| Toyota | C0040 | Brake pedal sensor fault 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 15
These 7-character codes are manufacturer-specific variants of C0040 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | C004000 | Front right wheel speed sensor circuit error Brand | Chassis |
| Mahindra | C004002 | Brake Light Switch Failure Brand | Chassis |
| Mercedes-Benz | C004012 | Brake Light Switch line break Brand | Chassis |
| Mahindra | C004012 | BLA active; Feedback is not active Brand | Chassis |
| Mahindra | C004014 | BLA not active; Feedback is active Brand | Chassis |
| Mercedes-Benz | C00401C | Brake light switch supply error - circuit voltage out of range Brand | Chassis |
| Mercedes-Benz | C00402A | brakelightswitch permanent high with silamemory Brand | Chassis |
| Mercedes-Benz | C004062 | BLS Plausibility Failure - signal compare failure Brand | Chassis |
| Mercedes-Benz | C004084 | Brake Light Switch line break Brand | Chassis |
| Mercedes-Benz | C004086 | No description available | Chassis |
| Smart | C004086 | No description available | Chassis |
| Mercedes-Benz | C004087 | No description available | Chassis |
| Smart | C004087 | No description available | Chassis |
| Mercedes-Benz | C0040FA | Bls_pls_plaus_error - 0xFA Brand | Chassis |
| Mercedes-Benz | C0040FF | Bls is permanent high (for HHC only) Brand | Chassis |
6Related codes
Browse Cxxx codes or C004xx codes.