What causes a U3065 code?

U3065 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 U3065 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U3065 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

U3065

Manufacturer-specific network code U3065

What it means

Communication error with the lighting control module or trailer interface. Indicates missing data packets regarding exterior lighting status.