What causes a U0180 code?

U0180 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a U0180 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0180 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

U0180

Lost Communication with Lighting Control Module

What it means

The vehicle's central gateway has lost communication with the primary lighting control module. This may affect external lighting and headlamp functions.