Wheel Speed Sensor Malfunction (Rear Left)
Indicates a problem with the rear left 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 computer monitors the speed of each wheel. If it receives inconsistent data from the rear left sensor, it triggers this code as it can’t accurately determine vehicle speed, affecting ABS and traction control.
What the computer is actually seeing
The Electronic Control Unit (ECU) expects a wheel speed signal between 0 and 60 mph (0 to 96 km/h) when the vehicle is moving. If the rear left sensor signals a speed discrepancy (for example, 0 mph when other wheels show speed), the ECU stores this code.
What a healthy reading looks like
Rear left wheel speed should match the other wheel speeds within 5 mph under similar conditions.
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 connector to the rear left wheel speed sensor for damage or corrosion. Decision: If damaged, repair/replace. If OK, proceed to step 2.
- 22. Measure the voltage at the wheel speed sensor connector with the key on (engine off). You should see around 5V at the signal wire. Decision: If no voltage, check the wiring continuity back to the ABS module. If voltage present, proceed to step 3.
- 33. With the vehicle in motion, use a scan tool to monitor the wheel speed data for the rear left wheel. Decision: If the rear left speed isn't reading while others do, replace the wheel speed sensor. If it reads but incorrectly, check for mechanical issues like a bad wheel bearing.
Common causes
- Faulty rear left wheel speed sensor
- Damaged wiring or connectors to the sensor
- Issues with the ABS control module
- Wheel bearing problems affecting sensor placement
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you should fix it soon. ABS and traction control may not work, making it less safe.
Will the code come back after clearing it?
If the underlying issue isn't fixed (like a bad sensor), the code will likely return.
Why does this code pair with others?
Codes like C1132 or C1131 often indicate similar sensor issues on other wheels or indicate related ABS problems.
Working a real vehicle right now?
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