What causes a U0384 code?

U0384 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 U0384 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0384 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

U0384

Network/CAN bus communication code U0384

What it means

Software Incompatibility with Glow Plug Control Module. The engine controller is receiving data from the glow plug module that does not match expected software parameters.