U0182
Lost Communication with Headlamp Leveling Control Module
The vehicle network has lost the headlamp leveling controller. Automatic leveling is disabled and the lamps stay in a default position; on many vehicles the headlight warning comes on.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- Leveling module unpoweredCommon
- Gateway module routing CAN messages incorrectlyLess likely
- CAN terminating resistor (120 Ω) drifted out of specLess likely
Parts involved
- Headlamp Leveling Module
- CAN Bus Wiring
U0182 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.