Wheel Speed Sensor Circuit Failure (Left Front)
Indicates a fault in the left front wheel speed sensor circuit.
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What it means (plain English)
The car's computer is sensing that the left front wheel speed sensor isn't working right or isn't communicating with the system, which can impact safety features like ABS.
What the computer is actually seeing
The control module is not receiving a valid signal from the left front wheel speed sensor; it expects around 0.5-5 volts AC depending on wheel speed and rotation.
What a healthy reading looks like
The left front wheel speed sensor should produce a signal voltage that correlates with wheel speed; typically 0.5-5V AC when the wheel is turning.
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 wiring and connectors to the left front wheel speed sensor for damage or corrosion. If any issues are found, repair or replace them.
- 22. Check the sensor resistance using a multimeter; it should be around 1,000-1,500 ohms. If it reads open or shorted, replace the sensor.
- 33. Connect a scan tool and check for other codes related to the ABS system. If present, address them first.
- 44. Measure voltage output from the sensor while the vehicle is moving; expect a signal in the range of 0.5-5 volts AC. If not present, replace the sensor.
- 55. If all checks pass but the code persists, consider testing or replacing the ABS control module.
Common causes
- Wiring damage or short to ground in the sensor circuit
- Failed wheel speed sensor
- Corroded connectors at the wheel speed sensor
- Faulty ABS control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not safe to drive without addressing this issue; it affects the ABS and could lead to loss of braking control.
Will the code come back after I clear it?
If the underlying issue isn't fixed, yes, it will likely return after clearing.
Why does this code show up with other wheel sensor codes?
Multiple sensors can fail together, or there may be a common wiring issue affecting multiple circuits.
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