OBD-II code · Chassis
C0054 Left Rear Wheel Speed Sensor Signal Erratic
Erratic pulses from the left rear wheel speed sensor. Wheel-speed signals feed ABS, ESC, traction control, transmission and odometer — a single dropped signal disables all of these safety functions until repaired.
Is it safe to drive with C0054?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyEncoder ring contaminated
- PossibleTone ring cracked
- Less likelyConnector with intermittent contact under vibration
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Wheel Speed Sensor Rl, Tone Ring, Hub Bearing
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.