Front Left Wheel Speed Sensor Circuit Failure
There’s a problem with the front left wheel speed sensor or its circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The front left wheel speed sensor is either not sending data or is broken, making the vehicle's ABS system unable to monitor the wheel's speed accurately.
What the computer is actually seeing
The ABS control module detects no signal or an irregular signal from the front left wheel speed sensor, which should provide voltage readings corresponding to wheel speed.
What a healthy reading looks like
Voltage signal from wheel speed sensor should be between 0.5V and 5V while the vehicle is moving; at rest, it should not exceed 0.1V based on a hall effect or variable reluctance design.
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 front left wheel speed sensor wiring and connector for damage or corrosion. Are they intact? - If yes, proceed to next step. If no, repair or replace damaged parts.
- 22. Check the resistance of the wheel speed sensor: Disconnect the sensor, and measure resistance across the terminals. Is it within 1,000 to 2,000 ohms? - If yes, proceed to next step. If no, replace the sensor.
- 33. With the sensor connected, measure the voltage output while the wheel is turned. Is the output voltage fluctuating between 0.5V and 5V? - If yes, go to the next step. If no, replace the sensor.
- 44. Use a scan tool to check for additional stored fault codes. Are there other related fault codes present? - If yes, review codes to check for systemic issues. If no, proceed to next step.
- 55. If all checks are normal, examine the ABS module for fault status. If no faults exist in the ABS module, monitor the system for intermittent issues.
Common causes
- Faulty front left wheel speed sensor
- Damaged harness or connector
- Corroded connections
- Wheel bearing issues affecting sensor
- ABS module fault
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's advisable to fix this code soon; driving with it could impair braking performance due to ABS malfunction.
Will this fault come back after repairs?
If repairs are done correctly and there are no underlying issues, the fault should not return.
Why does this code sometimes appear with traction control issues?
Both systems rely on accurate wheel speed data, so a fault in one can lead to issues in the other.
Working a real vehicle right now?
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