What causes a P0694 code?

P0694 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 P0694 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0694 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

P0694

Cooling Fan 2 Control Circuit High

What it means

The Engine Control Module (ECM) detects a high voltage condition or a short to power in the electric cooling fan control circuit. This indicates the fan is either staying on constantly or the control signal is not reaching the fan hub/solenoid.