What it means
The module detects a left-rear wheel-speed sensor signal outside the expected range or inconsistent with vehicle conditions. The code identifies a signal problem but does not specify its cause.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The ABS module compares the left-rear wheel-speed sensor signal with expected wheel rotation and the other wheel readings. This code sets when the left-rear signal is present but falls outside the expected range or behaves inconsistently.
Common causes
Most likely first.
- Damaged sensor wiring or connector
- Faulty wheel-speed sensor
- Damaged tone ring or encoder
- Loose sensor mounting
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Review freeze-frame data and graph all four live wheel-speed readings during a cautious low-speed drive; look for the left-rear value dropping out, jumping, or diverging.
- Inspect the left-rear sensor, connector, and harness for looseness, chafing, corrosion, or damage that could distort the signal.
- Check that the left-rear sensor is mounted firmly and positioned correctly, and inspect its tone ring or encoder for damage, contamination, or uneven rotation.
- Compare the left-rear sensor output with the other wheels while rotating the wheel and check for an irregular signal pattern.
- Test the left-rear sensor and wiring using the applicable procedure and manufacturer's specification.
Common fixes
- Secure a loose left-rear sensor or connector.
- Repair damaged left-rear sensor wiring or connector terminals.
- Clean debris from the left-rear sensor or encoder area.
- Replace a faulty left-rear wheel-speed sensor.
- Repair or replace a damaged left-rear tone ring or encoder.
Can I keep driving?
The brakes may still operate, but ABS and stability control can be disabled while the signal is unreliable. Drive gently with extra stopping distance and avoid conditions that may require those systems.
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.