What causes a U3137 code?

U3137 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 U3137 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U3137 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

U3137

Manufacturer-specific network code U3137

What it means

Information transfer error between the Body Control Module (BCM) and the Lighting Control Unit. This usually involves a proprietary network timing error.