ABS Wheel Speed Sensor Fault - Left Front
Issue detected in the left front ABS wheel speed sensor circuit.
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What it means (plain English)
The ABS system is not getting a signal from the left front wheel speed sensor, which helps it understand if the wheel is slipping or locking up.
What the computer is actually seeing
The ABS control module detects a fault in the left front wheel speed sensor circuit, typically resulting in a zero voltage or an open circuit condition when the wheel is turning.
What a healthy reading looks like
Sensor should output a voltage signal between 0.5V to 5V depending on wheel speed; expected frequency varies with vehicle speed, typically 2Hz to 40Hz at low to high speeds.
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 wiring and connector for the left front wheel speed sensor for any visible damage or corrosion. Decision: If damaged, repair or replace before further testing.
- 22. Check the sensor resistance with a multimeter; it should be around 1,000 ohms. Decision: If resistance is out of spec, replace the sensor.
- 33. With the vehicle on the ground, use a scan tool to monitor the wheel speed sensor data while the vehicle is moving. Decision: If the sensor does not show any data while the wheel is turning, replace the sensor.
- 44. Verify the ABS control module operation; ensure no additional codes exist that could affect sensor operation. Decision: Address any additional codes found.
Common causes
- Wiring issue or damage in the sensor circuit
- Faulty left front wheel speed sensor
- Loose or corroded connector at the sensor
- Wheel bearing failure affecting sensor signal
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally not safe to drive since the ABS system will be disabled, increasing the risk of losing control in slippery conditions.
Will this code come back after I clear it?
If the underlying issue isn't fixed, the code will likely return after some driving.
Why is this code paired with others like C0115?
These codes often relate to similar sensor issues or wiring problems affecting the ABS system's functionality.
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