A/B Wheel Speed Sensor Signal
Wheel speed sensor signal problem 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 not getting the correct signals from the wheel speed sensors which help it control braking and traction.
What the computer is actually seeing
The vehicle's computer expects a certain frequency signal from the wheel speed sensors, typically 0-12 volts AC, but it’s either too weak or missing.
What a healthy reading looks like
Wheel speed sensor output should be around 0-12 volts AC, with a frequency signal corresponding to vehicle speed (e.g., 0-60 Hz for speeds up to 60 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. Check the wiring and connectors at the wheel speed sensors for damage or corrosion. If damaged, repair or replace as needed. Decision: If wiring is okay, proceed to step 2; if damaged, fix and retest.
- 22. Measure the voltage output from the wheel speed sensor with a multimeter. You should see 0-12 volts AC while the wheel is turning. Decision: If you see the right voltage, move to step 3; if not, replace the wheel speed sensor.
- 33. Check for DTCs related to ABS or traction control systems. If other codes are present, investigate those systems. Decision: If more codes are present, follow those diagnostic paths first; if not, continue to step 4.
- 44. Inspect the sensor mounting area for debris or damage. Clean or repair as necessary. Decision: If the area is clean and in good shape, consider the sensor itself a likely cause.
Common causes
- Wiring issues (broken or corroded wiring)
- Faulty wheel speed sensor
- Weak or dead battery affecting sensor operation
- Dirty or damaged sensor mounting surface
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code present?
It's drivable but affects traction control and ABS performance. Fix it soon.
Will this code clear on its own?
Not usually. It requires addressing the root issue to clear.
Why does this code sometimes appear with others?
Commonly pairs with codes related to ABS or other wheel speed related faults.
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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