Wheel Speed Sensor Fault - Right Front
Indicates a fault with the right front wheel speed sensor.
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 right front wheel speed sensor measures how fast the wheel is turning. If this sensor fails or its signal is interrupted, it can cause abs issues and affect traction control systems.
What the computer is actually seeing
The computer monitors the voltage from the right front wheel speed sensor, which should typically range from 0.5 to 2.5 volts when the vehicle is stationary and up to 5 volts as vehicle speed increases. A fault code sets if the voltage is outside of expected ranges or the sensor circuit is open/shorted.
What a healthy reading looks like
Voltage reading from wheel speed sensor should fluctuate between 0.5V to 5V according to wheel speed, but not show a constant fault or zero value unless the vehicle is stationary.
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 wiring and connectors at the right front wheel sensor for damage or corrosion. Repair as necessary. Decision: Is wiring intact? (Yes/No)
- 22. Check the sensor output voltage while spinning the wheel. It should read a variable voltage as the wheel moves. Decision: Is voltage present and varying? (Yes/No)
- 33. If no voltage, swap the wheel speed sensor with the left front sensor to see if the code moves with the swap. Decision: Is the code now for C1236? (Yes/No)
- 44. If the code remains for C1237, inspect ABS module for faults or test it with a scan tool. Decision: Is ABS module functioning properly? (Yes/No)
- 55. Clear codes and take the vehicle for a test drive. Decision: Does the code return? (Yes/No)
Common causes
- Damaged wheel speed sensor
- Broken wiring or poor connections
- Sensor covered in dirt or debris
- Faulty anti-lock brake system (ABS) module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends on the vehicle. It's best to fix it soon, as it may affect stability control and ABS.
Will the code come back after repairs?
If the issue is resolved, the code should not return, but if the sensor or wiring remains faulty, it will.
Why does this code pair with other codes?
Wheel speed sensors are critical for stability control and ABS functions. A fault in one can influence readings across various systems.
Working a real vehicle right now?
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