Left Front Wheel Speed Sensor Circuit Performance
This code indicates an issue with the left front wheel speed sensor or its circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The left front wheel speed sensor measures how fast the wheel is turning. If it's faulty or the circuit has a problem, your vehicle's computer can't use this information properly, which is critical for safety features like ABS.
What the computer is actually seeing
The computer expects a consistent voltage pulse from the wheel speed sensor as the wheel rotates, typically around 0.5 to 2.5 volts, varying based on speed. If the voltage is erratic or constant (like 0V or too high), it triggers this code.
What a healthy reading looks like
Expected sensor signal is about 1.0 to 2.0 volts at 10 mph; should change as speed increases.
Guided diagnostic — the DiagCoach way
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.
- 11. Inspect the left front wheel speed sensor connector and wiring for damage or corrosion. If damaged, repair or replace the connector or wires. DECISION: If wiring is okay, proceed to step 2. If damaged, fix and retest.
- 22. Check the sensor resistance using a multimeter; expected range is about 1,000 to 2,500 ohms. If out of range, replace the sensor. DECISION: If the sensor is within spec, proceed to step 3. If out of spec, replace the sensor and retest.
- 33. Use a scan tool to monitor wheel speed while driving. Compare left front wheel speed against the right front wheel speed; they should be similar under the same conditions. DECISION: If there's a significant difference with a good reading on the right side, replace the left front wheel speed sensor. If readings are similar or all good, further investigate other ABS system components.
Common causes
- Faulty left front wheel speed sensor
- Damaged wiring or connectors in the speed sensor circuit
- Corrosion at connection points
- Physical damage to the sensor from road debris
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It may impact ABS function, increasing stopping distances on slippery surfaces. Fix it soon.
Will this code come back after I clear it?
If the underlying issue isn't resolved, yes, it will likely return.
Why does this code appear with other codes?
Related codes usually indicate issues with multiple wheel sensors or the ABS module.
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