Wheel Speed Sensor Circuit Malfunction (Left Front)
Left front wheel speed sensor circuit is malfunctioning.
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What it means (plain English)
The computer isn't getting a reliable signal from the left front wheel speed sensor, which helps it track how fast the wheel is turning. This can happen if the sensor or its wiring is damaged.
What the computer is actually seeing
The ABS control module expects a voltage signal that varies based on wheel speed. A properly functioning sensor will produce a waveform voltage between 0.5V and 5V as the wheel turns. If it sees a consistent voltage or no change, it triggers this code.
What a healthy reading looks like
Voltage signal should fluctuate between 0.5V to 5V when the vehicle is moving; frequency of the signal should match 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 wiring and connectors at the left front wheel speed sensor for damage or corrosion. Repair if necessary. Decision point: Is the wiring intact? If yes, proceed to step 2; if no, repair wiring and retest.
- 22. Check the left front wheel speed sensor. Disconnect the sensor and measure the resistance. Expect it to be around 1k ohm. Decision point: Is the resistance within spec? If yes, proceed to step 3; if no, replace the sensor.
- 33. Reconnect the sensor and use a scan tool to monitor the live data while spinning the left front wheel. Decision point: Is the sensor signal changing appropriately? If yes, the circuit is good; if no, replace the wheel speed sensor.
Common causes
- Damaged sensor
- Poor wiring or connectors
- Corrosion at the sensor connector
- Sensor misalignment or debris on the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so you can drive, but ABS may be disabled. Get it fixed soon.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, the code will likely return.
Why does this code pair with others?
Often, multiple sensors work together for stability control. Issues in one can cause faults in others.
Working a real vehicle right now?
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