Wheel Speed Sensor Circuit Range/Performance Problem (Left Front)
Wheel Speed Sensor on the left front wheel has a performance issue.
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 Wheel Speed Sensor measures how fast the wheels are turning. If it goes bad, the computer can't tell how fast you're going or if there's a problem with traction.
What the computer is actually seeing
The Vehicle Control Module (VCM) compares the signal from the left front wheel speed sensor with the other wheel speed sensors. If the left front sensor's signal is too far off (for example, a voltage reading that’s supposed to be 0-5V but reads above or below that range significantly), it sets this code.
What a healthy reading looks like
Wheel speed sensors typically output a voltage in the range of 0-5V DC. While stationary, the reading should be around 0V, increasing as the wheel turns.
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 wiring and connector for damage or corrosion. If found, repair/replace.
- 22. Check the voltage signal at the left front wheel speed sensor with a multimeter while rotating the wheel. Expected voltage should vary between 0-5V as the wheel turns. If it's out of range, the sensor may be faulty.
- 33. Use a scan tool to review live data and look at the readings from the other wheel speed sensors. Are they consistent? If the left front is significantly different while driving, chances are it's the sensor.
- 44. If the sensor is reading fine, inspect the VCM for faults or perform a software update if necessary.
Common causes
- Faulty left front wheel speed sensor
- Damaged wiring or poor connection at the sensor
- Issues with the Vehicle Control Module (VCM)
- Metal debris on the sensor
- Incorrect tire size affecting wheel rotation speed
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should fix it soon; driving can lead to issues with traction control and ABS performance.
Will this code come back after repairs?
If you correctly identify and resolve the underlying issue, resetting the code and performing a test drive should clear it.
Why does this code show up with others like C117A?
It's common for wheel speed sensor issues to generate multiple codes, especially if there are multiple sensors that are linked to the same system. They can affect each other.
Working a real vehicle right now?
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