What causes a P0683 code?

P0683 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 P0683 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0683 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

P0683

Glow Plug Control Module to PCM Communication Circuit

What it means

The engine control module has lost communication or detected an incorrect signal from the Glow Plug Control Module (GPCM) circuit.