Wheel Speed Sensor Malfunction
There's a problem with the wheel speed sensor 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 measures how fast your wheel is turning. If it’s malfunctioning, the vehicle may not know how fast it's going, which can affect traction control and ABS.
What the computer is actually seeing
The vehicle’s computer receives erratic or no signals from the wheel speed sensor when it should be seeing a varying voltage signal that corresponds to wheel speed.
What a healthy reading looks like
Typically, the sensor outputs a signal voltage between 0.5 to 5 volts, oscillating based on 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 vehicle's speedometer operation to determine if the wheel speed signal is completely lost or erratic. Decision: If the speedometer works, the issue may be isolated to the ABS system rather than the sensor itself.
- 2Inspect the wiring and connectors at the wheel speed sensor for damage or corrosion. Decision: If damaged, repair or replace these components.
- 3Use a multimeter to test the voltage output of the wheel speed sensor while the vehicle is moving. Expect 0.5 to 5 volts. Decision: If readings are out of range, replace the sensor.
- 4Check the ABS module for any fault codes related to the wheel speed sensor. This can help isolate a problem with the module itself if the sensor checks out. Decision: If the ABS module shows issues, further diagnostic on the module is needed.
Common causes
- Bad wheel speed sensor
- Wiring issues (cut, frayed, or damaged wires)
- Corroded connectors
- Faulty ABS control module
- Incorrectly installed brake components
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with a C1250 code?
It's moderate severity; you can drive, but expect issues with traction control and ABS until it's fixed.
Will this code come back after clearing?
If the underlying issue isn't resolved, it will typically return shortly after clearing.
Why does this code often pair with C1241?
C1241 indicates a specific wheel sensor or circuit problem that overlaps with general wheel speed sensor faults like C1250.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →