What it means
This code identifies a subfault associated with the supply to the left-rear wheel-speed sensor. The base code alone does not establish the specific supply-circuit failure.
How it works
The left-rear wheel-speed sensor requires a supply circuit so the ABS module can receive its wheel-rotation information. This code identifies a subfault in the left-rear sensor supply; the specific failure may be in its wiring, connector, fuse or feed, sensor, or module supply path.
Common causes
Most likely first.
- Open or short in sensor supply wiring
- Blown fuse or lost power supply
- Loose or corroded connector
- ABS module supply fault
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Read the ABS subtype and freeze-frame data, and check whether other wheel-sensor supply codes are present.
- Inspect the left-rear sensor connector and harness for corrosion, water entry, impact damage, or a loose connection.
- Use the vehicle wiring information to identify and check the relevant fuse and power feed.
- Measure supply and ground at the left-rear sensor connector according to the manufacturer's procedure and compare with specification.
- Check the left-rear supply wiring for opens or shorts and verify connector terminal fit using the prescribed circuit test.
- If the supply wiring and feed are sound, test the left-rear sensor and ABS-module supply output in sequence.
Common fixes
- Clean, secure, or repair corroded left-rear sensor connector terminals.
- Repair an open, short, or damaged section of left-rear supply wiring.
- Replace a failed fuse after locating and correcting the cause.
- Replace the left-rear wheel-speed sensor if it is confirmed to be faulty.
- Repair an ABS-module supply fault only after verifying the fuse, feed, and sensor wiring.
Can I keep driving?
The left-rear wheel-speed signal may be unavailable, limiting ABS, stability control, or related functions. Drive cautiously with extra stopping distance and avoid slippery roads until the supply fault is corrected.
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.