What causes a U0048 code?

U0048 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 U0048 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0048 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

Log in Sign up

OBD-II

U0048

Control Module Communication Bus D

What it means

A general failure is reported on communication Bus D, which often links secondary systems like body controllers or cabin electronics.

Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes

Log in Sign up free