Invalid Data Received From Rain/Light Sensor Module
The U0490 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Rain/Light Sensor Module. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $100 - $400 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Auto headlights not responding to light changes
- Auto wipers too sensitive or not sensitive enough
- Lights staying on in daylight
- Tunnel detection not working
Probable Causes (Ranked by Likelihood)
- Rain/light sensor contaminated Very High
- Sensor module failure High
- CAN bus data error Moderate
- Windshield tint affecting sensor Low
Step-by-Step Diagnostic Procedure
-
Clean sensor area on windshield
-
Check sensor after windshield replacement
-
Scan sensor module for codes
-
Verify sensor position behind mirror
Frequently Asked Questions
Can I drive with U0490?
Yes. Use manual headlight and wiper controls.
What causes U0490?
Often contamination on the sensor or improper reinstallation after windshield replacement.
How much to fix?
Typically $100 to $400.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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