ABS Wheel Speed Sensor A Malfunction
There’s a problem with 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 ABS system relies on wheel speed sensors to help prevent wheel lockup during braking. If there's an issue with the sensor or its wiring, the system can't correctly read how fast the wheel is turning.
What the computer is actually seeing
The ABS control module monitors the signal from the Wheel Speed Sensor A. If the signal is outside of the expected range or absent (usually around 0-12V while the vehicle is moving), it sets this fault code.
What a healthy reading looks like
Voltage signal from the wheel speed sensor should be between 0.5V to 5V for proper operation 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 for the Wheel Speed Sensor A for damage or corrosion. If found, repair/replace as necessary. Decision Point: Is the wiring intact?
- 22. Measure the voltage at the wheel speed sensor connector with the vehicle moving. Expected value is between 0.5V and 5V. Decision Point: Is voltage in the expected range?
- 33. If the voltage is out of range, swap the wheel speed sensor with another wheel (if possible) and check for changes in the fault code. Decision Point: Did the fault code change?
- 44. If swapping the sensor doesn't change the code, inspect the ABS control module and its connections. Decision Point: Is the ABS control module functioning correctly?
Common causes
- Damaged wheel speed sensor
- Corroded connector or wiring
- Faulty ABS control module
- Mechanical obstruction at the wheel speed sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should fix it soon, as it affects braking performance; however, you can drive it short distances.
Will this issue come back after clearing the code?
If the underlying problem isn’t fixed, yes, the code will likely reappear.
Why might this affect my brake system?
The ABS system uses wheel speed data to prevent wheel lockup. Any malfunction can cause improper braking behavior.
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