Rear Wheel Speed Sensor Fault
Issues detected with the rear wheel speed sensor signal.
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What it means (plain English)
This code means the computer isn't getting a good signal from the rear wheel speed sensor, which helps the vehicle know how fast the wheels are turning.
What the computer is actually seeing
The computer expects a voltage signal from the rear wheel speed sensor that should fluctuate with wheel rotation—typically around 0-5 volts, depending on wheel speed.
What a healthy reading looks like
Voltage should range from 0.1V (at low speeds) up to 4.5V (at higher speeds) depending on wheel rotations.
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 rear wheel speed sensor. Look for damage, corrosion, or loose connections. If found, repair or replace as necessary.
- 22. Check the rear wheel speed sensor itself. Disconnect the sensor and use a multimeter to measure resistance; it should typically be within 1-2k ohms. Replace if out of spec.
- 33. Test the voltage output at the sensor while the vehicle is moving. Confirm it fluctuates properly between 0.1V and 4.5V. If not, further investigate alignment or bearing issues.
- 44. Clear the code and take the vehicle for a test drive. If the code returns immediately, the sensor or wiring is likely at fault.
Common causes
- Damaged wiring or connectors for the rear wheel speed sensor
- Faulty rear wheel speed sensor
- Absence of wheel speed due to brake drag or frozen bearings (preventing wheel rotation)
- Poor wheel alignment affecting sensor function
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally not safe as it can affect ABS functionality, prompting instability during braking.
Will this code come back if I reset it?
If the issue isn't fixed, yes, it will return after driving.
Why does this code pair with other codes?
Codes like C1096 or C1099 indicate similar issues in other wheel speed sensors or related systems; all work together for vehicle stability.
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