Left Front Wheel Speed Sensor Signal Intermittent
The left front wheel speed sensor is sending an intermittent signal to the computer.
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What it means (plain English)
The sensor that measures how fast the left front wheel is spinning is having issues sending a consistent signal, meaning the computer can't fully trust the data it gets from it.
What the computer is actually seeing
The ABS module expects a steady signal from the left front wheel speed sensor, usually a voltage between 0 to 5 volts as the wheel turns. When the sensor is working, it sends smooth voltage changes corresponding to wheel speed. If it’s faulty, the signal may drop out or vary excessively.
What a healthy reading looks like
Normal sensor output is around 0.5 volts at rest, increasing to around 5 volts as the wheel speed approaches 100 km/h.
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 at the left front wheel speed sensor for damage or corrosion. Repair as necessary. Decision: Is there visible damage? Yes: Repair wiring. No: Go to Step 2.
- 22. Test the voltage output of the left front wheel speed sensor at the connector. Expected outcome is 0.5 volts at rest. Decision: Is the voltage within range? Yes: Go to Step 3. No: Replace the sensor.
Common causes
- Faulty left front wheel speed sensor
- Damaged wiring or connectors
- Corrosion at the sensor connector
- Wheel bearing failure affecting sensor alignment
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but be aware that the ABS may not function correctly, especially during hard braking or slippery conditions.
Will this problem come back after clearing the code?
If it’s an intermittent signal, it could return if the underlying issue isn't fixed.
Why is this code paired with other codes?
Intermittent speed signals often affect multiple systems, leading to other related codes in the ABS or traction control systems.
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