What causes a P0690 code?

P0690 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 P0690 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0690 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

P0690

ECM/PCM Power Relay Sense Circuit High

What it means

The Engine Control Module detects a voltage signal from the main power relay sense circuit that exceeds the expected maximum threshold while the ignition is on.