Invalid Data Received From Headlamp Leveling Module
The U0431 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Headlamp Leveling Module. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $600 (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
- Headlights aiming too high or too low
- Auto-leveling headlights not adjusting
- Headlamp leveling warning light
- Oncoming drivers flashing their lights
Probable Causes (Ranked by Likelihood)
- Failed headlamp level sensor Very High
- Headlamp leveling motor failure High
- CAN bus data error Moderate
- Rear suspension height change affecting level Low
Step-by-Step Diagnostic Procedure
-
Check headlamp leveling sensors
-
Test leveling motor operation
-
Scan leveling module for codes
-
Verify rear suspension height
Frequently Asked Questions
Can I drive with U0431?
Yes, but headlights may aim incorrectly, potentially blinding other drivers.
What causes U0431?
Usually a failed headlamp level sensor or leveling motor.
Is misaimed headlights a safety issue?
Yes. Improperly aimed headlights reduce your visibility and blind other drivers.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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