Wheel Speed Sensor A Malfunction
This code indicates a problem with the wheel speed sensor A signal.
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 wheel speed sensor A is supposed to send a voltage signal to the ABS module that changes based on the wheel speed. If the signal isn't working or is out of range, this code sets.
What the computer is actually seeing
The ABS control module monitors the wheel speed sensor A signal; it expects a voltage between 0.5V to 5V as the wheel spins. If it sees a constant voltage that doesn’t change when the wheel speed changes, it triggers this code.
What a healthy reading looks like
Expected values for wheel speed sensors typically fluctuate between 0 to 5 volts based on the speed of the wheel, ideally giving a smooth change as the vehicle accelerates or decelerates.
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.
- 1Check the condition of wiring and connectors at the wheel speed sensor A for damage or corrosion. Repair if necessary, then retest.
- 2Measure the voltage at the wheel speed sensor A connector while the vehicle is in motion. You should see variability between 0.5V and 5V. If not, replace the sensor if readings are off.
- 3Test for continuity and ground. Ensure there is a good ground on the harness, expecting near 0 ohms. If ground is good but voltage is faulty, replace the ABS control module.
Common causes
- Faulty wheel speed sensor A
- Damaged wiring or connectors to the wheel speed sensor A
- Corrosion at the sensor connector
- Incorrect installation of the sensor
- Faulty ABS control module
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but ABS may not operate properly; stopping distances can increase in emergencies.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return after clearing and driving.
Why does this code pair with other codes?
Codes may indicate problems with other wheel speed sensors or components involved in ABS operation.
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