Wheel Speed Sensor - Rear Left Circuit - Open
Rear left wheel speed sensor circuit is open or broken.
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What it means (plain English)
The rear left wheel speed sensor is either not connected properly, has a bad wire, or the sensor itself is damaged, causing inaccurate speed readings.
What the computer is actually seeing
The ABS system monitors the voltage from the wheel speed sensor which should be around 0-5 volts depending on the vehicle speed. If the signal is absent or below a minimum threshold, it sets this code.
What a healthy reading looks like
A properly functioning wheel speed sensor should output a voltage between 0.1V and 4.5V as the wheel turns. ABS modules expect this value to fluctuate with speed.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect the wiring and connectors at the rear left wheel speed sensor for damage or corrosion. Decision point: Are the connections solid and intact?
- 2If the wiring looks good, use a multimeter to check for voltage at the sensor connector with the key on (engine off). Expected voltage should be 0-5V. Decision point: Is there voltage present?
- 3If no voltage, inspect the wiring back to the ABS control module for continuity. Decision point: Is there continuity?
- 4If continuity is good, swap the wheel speed sensor with another wheel's sensor if possible and retest. Decision point: Did the code return?
- 5If code returns, check the ABS module functionality and wiring directly to the module.
Common causes
- Disconnected or damaged connector
- Broken wire in the sensor circuit
- Faulty wheel speed sensor
- Corrosion on wiring or connector
- ABS module issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; safe for short distances but fix soon to ensure ABS functionality.
Will this code come back after clearing?
Yes, if the underlying issue isn't fixed, the code will reappear.
Why does this code appear with other wheel speed sensor codes?
Typically because multiple sensors provide data, and if one fails, it can affect the readings from the others.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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