C0056Left Rear Wheel Speed Sensor Circuit Intermittent
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Covers an intermittent fault in the left rear wheel speed sensor circuit, where the signal is lost or corrupted only part of the time rather than permanently. The ABS/ESC module expects a clean pulse train proportional to wheel speed; a chafed wire that opens over bumps, a loose or corroded connector, a cracked sensor or a contaminated encoder ring can make the signal drop out briefly. Because the fault is sporadic it may set and self-clear, and ABS, traction and stability control drop out only during the glitches. The ABS warning lamp is set and base braking remains. Bosch active wheel speed sensors depend on a stable two-wire supply and a clean air gap to the encoder. No code-specific public bulletin was confirmed; the entry follows the SAE J2012 generic definition.
- What you may notice
- Intermittent ABS warning lamp
- ABS/ESC drops out briefly
- Speedometer flickers
- Likely causes
- LikelyChafed wire or loose connector
- PossibleCracked sensor or contaminated encoder
- RareExcessive or varying air gap
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.