U2120
Lost Communication With Dynamic Headlamp Leveling Device
U2120 is an OBD-II diagnostic trouble code meaning: Lost Communication With Dynamic Headlamp Leveling Device. Common causes: open or short circuit in the power supply, damage to the wiring harness to the adjustment device. Estimated repair cost: $17–89.
Symptoms
- The malfunction indicator on the dashboard is on
- Headlight leveling system does not work
- Headlights are aimed in the wrong position
- Intermittent operation of the control system
- Other related lighting system errors
Causes
- Open or short circuit in the power supply
- Damage to the wiring harness to the adjustment device
- Malfunction of the headlight leveling motor
- Problems with the body control module
- Corrosion of contacts or connectors
How to Fix
- Check system fuses and relays
- Inspect the wiring harness for damage
- Check power and ground on the adjustment device
- Test the headlight leveling motor
- Scan the control unit for other errors
Related codes
FAQ
What does the U2120 code mean?
U2120 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Dynamic Headlamp Leveling Device
What causes a U2120 error code?
The most common causes of U2120 include: Open or short circuit in the power supply; Damage to the wiring harness to the adjustment device; Malfunction of the headlight leveling motor; Problems with the body control module.
How do I fix a U2120 diagnostic trouble code?
To fix U2120: Check system fuses and relays. Inspect the wiring harness for damage. Check power and ground on the adjustment device. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U2120?
Limited driving only, diagnose soon
How much does it cost to fix U2120?
The estimated repair cost for U2120 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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