Headlight Auto-Leveling System Malfunction
The B0073 code means the vehicle's onboard diagnostic system has detected: Headlight Auto-Leveling System Malfunction. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $150 - $600 (parts and labor)
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Common Symptoms
- Beam aim too high or too low
- Leveling warning on dashboard
- Oncoming drivers flashing lights
- Uneven beam pattern
Probable Causes (Ranked by Likelihood)
- Failed leveling motor Very High
- Faulty ride height sensor High
- Leveling control module failure Moderate
- Damaged wiring between sensor and module Low
Step-by-Step Diagnostic Procedure
-
Scan for leveling DTCs
-
Test ride height sensors
-
Check leveling motor with scan tool
-
Inspect sensor-to-module wiring
Frequently Asked Questions
What is headlight auto-leveling?
Adjusts beam angle based on load and road pitch to prevent blinding oncoming drivers.
Can I manually adjust with auto-leveling?
Manual screws exist but auto-leveling overrides them.
Is it required for all headlights?
Required by European regulations for HID or LED projectors.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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