What it means
This code identifies a subfault associated with the supply to the left-front wheel-speed sensor. The base code alone does not establish the specific supply-circuit failure.
How it works
The left-front wheel-speed sensor needs an electrical supply for the ABS module to receive its rotation signal. This code points to a subfault in that sensor's supply path; the subtype and circuit tests determine whether the issue is a lost supply, wiring fault, poor connection, or sensor problem.
Common causes
Most likely first.
- Open or short in sensor supply wiring
- Poor connector contact or corrosion
- Sensor fault
Symptoms
- ABS warning light
- Traction-control or stability-control warning
- ABS or stability-control function may be limited
How to diagnose it
- Read the ABS-module subtype and freeze-frame data, and check whether other sensor-supply codes appeared at the same time.
- Inspect the left-front sensor connector and harness for corrosion, water intrusion, pin damage, or wiring pulled tight at the steering knuckle.
- Check the relevant fuse and power feed identified by the vehicle wiring information before probing the sensor circuit.
- Measure the left-front sensor supply and ground according to the manufacturer's procedure, comparing results with its specification.
- With the circuit powered down as directed, check the left-front supply wiring for opens or shorts and inspect connector terminal fit.
- If wiring and supply are correct, test the left-front sensor and ABS-module supply output using the manufacturer's diagnostic sequence.
Common fixes
- Clean and secure the left-front sensor connector and terminals.
- Repair an open, shorted, or chafed section of the left-front sensor supply wiring.
- Replace a failed fuse after finding and correcting the cause of the fuse failure.
- Replace the left-front wheel-speed sensor if it is confirmed to be loading or interrupting the supply circuit.
- Repair an ABS-module supply fault only after confirming the sensor circuit and its power feed.
Can I keep driving?
The brakes may work, but ABS and traction or stability control may be limited while the left-front sensor lacks a reliable supply. Drive cautiously, increase following distance, and avoid slippery conditions until 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.