Wheel Speed Sensor 'A' Circuit
Fault in the 'A' wheel speed sensor circuit detected.
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 saying it can't get a reading from the wheel speed sensor on one wheel, which is important for things like ABS and traction control.
What the computer is actually seeing
The ECU expects a voltage signal that fluctuates with wheel speed, typically between 0.5V and 5V, depending on the sensor type and vehicle speed. A flat signal or one that's out of that range indicates a problem.
What a healthy reading looks like
0.5V to 5V signal; should change with wheel 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.
- 1Check the wiring and connector at the 'A' wheel speed sensor for damage or corrosion.
- 2Measure the voltage at the wheel speed sensor connector; expect 0.5V to 5V with the wheel spinning.
- 3If the voltage is out of range, inspect wires for shorts or opens, and check the connector pins for corrosion. If damaged, repair or replace as needed.
- 4If wiring is good, swap the wheel speed sensor with another wheel (if applicable) to see if the code follows the sensor or stays with the 'A' position.
Common causes
- Damaged wheel speed sensor
- Faulty wiring or connector to the sensor
- Signal interference from other electrical components
- Controller issues
- Bad grounding circuit
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends. You may lose ABS and traction control; drive cautiously and consider repairs soon.
Will the code return after repair?
If you fix the wiring or sensor, it shouldn't return unless there's another underlying issue.
Why does this code sometimes pair with other codes?
Multiple codes can occur if more than one wheel speed sensor is affected or there's an issue with the ABS module.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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