Left Rear Wheel Speed Sensor Circuit
Issues detected in the left rear wheel speed sensor circuit.
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What it means (plain English)
The left rear wheel speed sensor isn't sending the right signals. This can affect how the vehicle handles and stops, especially under braking.
What the computer is actually seeing
The computer expects to see a voltage signal from the left rear wheel speed sensor that fluctuates in relation to the wheel's speed. Normally, this should be a square wave signal varying between 0V and about 5V.
What a healthy reading looks like
0V when stationary, and a signal varying between 0V and 5V as the wheel rotates, typically about 5V at full 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.
- 11. Inspect the left rear wheel speed sensor wiring for damage or corrosion. Check for fraying or shorts. If found, repair as needed.
- 22. Check the sensor connector for tightness and corrosion. Clean or reseat as necessary. If damaged, replace the connector.
- 33. Use a multimeter to measure the voltage at the sensor connector. You should see a fluctuation between 0V and 5V. If no signal is present, replace the sensor.
- 44. If you have valid readings from the sensor, check for any issues in the ABS system that may be causing interference.
- 55. Clear the code and take the vehicle for a test drive to see if the code reappears.
Common causes
- Wiring damage or short to ground
- Faulty left rear wheel speed sensor
- Connector issues including corrosion or loose connection
- Intermittent fault due to road conditions (dirt, moisture)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It can be drivable, but expect potential ABS issues, which can affect braking performance.
Will this issue come back after fixing?
If the sensor or wiring is properly replaced, it shouldn't recur unless there's a new fault.
Why do I see this code with other ABS codes?
Multiple codes can indicate a systemic issue in the ABS wiring or multiple bad sensors.
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