Ambient Light Sensor Malfunction
The vehicle's ambient light sensor has detected a fault.
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 ambient light sensor is supposed to adjust lights automatically based on how bright it is outside. If it's broken, your lights might not work properly in the dark or during the day.
What the computer is actually seeing
The vehicle's computer expects a specific voltage (typically around 0.5 to 4.5 volts) from the ambient light sensor corresponding to light levels. It sees a voltage outside this range or doesn't see a voltage at all.
What a healthy reading looks like
0.5V (minimum daylight) to 4.5V (maximum darkness) from the sensor under normal operation.
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 wiring and connector for the ambient light sensor. Look for frays, corrosion, or damage.
- 22. Measure the voltage at the ambient light sensor connector with the ignition in the 'on' position and the engine running. Expected range is 0.5V to 4.5V.
- 33. If voltage is outside this range, check the sensor; replace if necessary.
- 44. If voltage is within range, check for shorts or opens in the wiring harness leading back to the vehicle computer.
- 55. Clear the code and perform a drive cycle to see if the code returns.
Common causes
- Faulty ambient light sensor
- Wiring issues or poor connections
- Corrosion on sensor or connector
- Damaged harness or pins
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it is drivable but lighting performance may be affected. Fix it when convenient.
Will this code come back after clearing?
If the underlying issue isn't resolved, it's likely to reappear.
Why does it pair with other codes?
Multiple codes can indicate a broader issue with the sensor system or related components.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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