C0054

Left Rear Wheel Speed Sensor Signal Erratic

Moderate severity

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.

Common causes

Encoder ring contaminated
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $90-500
Tone ring cracked
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $90-500
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does C0054 mean?

C0054 means "Left Rear Wheel Speed Sensor Signal Erratic". It is a generic OBD-II code that points to a fault in the chassis.

What are the most common causes of C0054?

encoder ring contaminated; tone ring cracked; connector with intermittent contact under vibration — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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