What causes a U0080 code?

U0080 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 U0080 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0080 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

U0080

Vehicle Communication Bus H Performance

What it means

Indicates a loss of communication or signal degradation on the High-Speed CAN Bus H. This can cause various modules to lose connectivity with the vehicle network.