What does code C0503 mean?

Q: What does code C0503 mean?

Left Front Wheel Speed Sensor A Circuit High. C0503 means the anti-lock brake system (ABS) module sees an abnormally high voltage on the left front wheel speed sensor circuit, which usually indicates an open circuit, a short to voltage, or a sensor that has failed internally. The computer expects a fluctuating alternating current signal as the wheel turns, and a high-voltage condition tells it the signal is outside the normal range.

DTC codes / C05xx · Brakes, steering and suspension / C0503

C0503Left Front Wheel Speed Sensor A Circuit High

C0503 means the anti-lock brake system (ABS) module sees an abnormally high voltage on the left front wheel speed sensor circuit, which usually indicates an open circuit, a short to voltage, or a sensor that has failed internally. The computer expects a fluctuating alternating current signal as the wheel turns, and a high-voltage condition tells it the signal is outside the normal range.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.