Wheel Speed Sensor A Circuit Malfunction
Fault in the wheel speed sensor circuit for wheel A.
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 computer is having trouble getting a speed reading from the wheel speed sensor on the front left wheel.
What the computer is actually seeing
The ABS or traction control module expects a certain voltage from the wheel speed sensor. If the sensor is damaged or there’s an open circuit, the voltage remains low (near 0V) when moving.
What a healthy reading looks like
When functioning correctly, the wheel speed sensor should output a voltage varying between 0.5V to 2.5V when the wheel is turning at speeds above 3 mph.
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 wheel speed sensor for visible damage or corrosion. Decision Point: If damaged, repair or replace wiring/connectors; if good, proceed to step 2.
- 22. Measure the voltage at the sensor connector with the wheel spinning. Expected voltage is 0.5V to 2.5V. Decision Point: If voltage is low (<0.5V), replace the wheel speed sensor; if good, proceed to step 3.
- 33. Check for any DTCs stored in the ABS control module that may point to another fault in the system. Decision Point: If related codes show an issue elsewhere, address those codes first; if none, the module may be faulty.
Common causes
- Faulty wheel speed sensor
- Damaged wiring or connectors
- Corrosion at connection points
- Module failure
- Incorrect sensor installation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but avoid aggressive driving; the ABS system may not function properly.
Will the code come back after resetting?
If the underlying issue isn’t fixed, it will likely return after a short drive.
Why do I see this code along with others?
Multiple codes can point to issues with the entire ABS system or related sensors.
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