What it means
This code identifies a subfault associated with the left-rear wheel-speed sensor. The base code does not specify the electrical or signal failure; consult the failure subtype and vehicle diagnostics.
How it works
The left-rear wheel-speed sensor reads the left-rear tone wheel and sends a rotation signal to the ABS module. This base code identifies a left-rear sensor-related subfault without specifying whether the sensor, its wiring, or the signal conditions are at fault.
Common causes
Most likely first.
- Wheel speed sensor failure
- Damaged or corroded sensor wiring
- Loose or contaminated connector
- Excessive sensor air gap
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Read the ABS code subtype and freeze-frame data to see the left-rear speed reported when the fault set.
- Compare live left-rear wheel speed with the other wheels during slow rotation, looking for a missing or erratic reading.
- Inspect the left-rear sensor, mounting point, connector, and harness for damage, corrosion, contamination, or looseness.
- Check the left-rear tone wheel or encoder and sensor gap for debris, damage, or excessive clearance.
- Test the left-rear sensor and its wiring for opens, shorts, or intermittent connection using the manufacturer's procedure.
- If the sensor circuit passes, investigate the tone-wheel signal and ABS-module input before replacing the module.
Common fixes
- Clean and secure the left-rear sensor connector.
- Repair corroded or damaged left-rear sensor wiring.
- Remove debris or correct sensor seating affecting the left-rear air gap.
- Replace the left-rear wheel-speed sensor if the test confirms failure.
- Repair or replace a damaged left-rear tone wheel or encoder.
Can I keep driving?
ABS and stability control may be reduced or unavailable, though ordinary braking may still work. Drive cautiously, keep more distance, and avoid slippery conditions until the left-rear sensor fault is repaired.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.