Left Front Wheel Speed Sensor Circuit

The computer is seeing an error in the signals from the left front wheel speed sensor, which can affect traction control and anti-lock braking systems.

The ABS module expects a consistent voltage signal between 0.5V to 5V, corresponding to the wheel speed. It sees a voltage outside this range or no signal at all for a set duration (typically over 1 second).

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.

1. 11. Inspect the wiring and connectors for the left front wheel speed sensor. Repair any damage or corrosion found. Decision: If fixed, clear codes and test drive. If code returns, continue to step 2.
2. 22. Measure the voltage output from the left front wheel speed sensor while the vehicle is moving. Expected value is 0.5V to 5V. Decision: If not in range, go to step 3. If in range, suspect ABS module issue or further wiring issues.
3. 33. Swap the left front wheel speed sensor with a known good sensor (like right front). Clear codes and check if the code follows the sensor. Decision: If code follows, replace the sensor. If code remains, inspect ABS module.

• Damaged sensor wire
• Faulty wheel speed sensor
• Corroded connector
• ABS module failure

$$$