Headlamp Leveling Module Module No Response
The U0668 code means the vehicle's onboard diagnostic system has detected: Headlamp Leveling Module Module No Response. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $700
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 aimed too high or low
- Headlamp leveling warning
- Uneven headlight beam pattern
- Auto-leveling not functioning
Probable Causes (Ranked by Likelihood)
- Headlamp leveling motor failure Very High
- Level sensor at rear axle fault High
- Wiring damage to leveling system Moderate
- Module communication error Low
Step-by-Step Diagnostic Procedure
-
Test headlamp leveling motors manually
-
Check rear axle level sensor
-
Inspect wiring between sensors and module
-
Verify module communication on vehicle network
Frequently Asked Questions
Can I drive with U0668?
Check the severity. If it affects safety systems like stability control or braking, limit driving to short distances. Comfort features like heaters or parking assist are safe to drive with.
What causes U0668?
Most commonly a faulty headlamp leveling module or damaged wiring in the communication circuit to that module.
How much does it cost to fix U0668?
Typical repair costs range from $150 - $700 depending on whether the module or just wiring needs repair.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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