What causes a P0693 code?

P0693 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 P0693 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0693 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

P0693

Cooling Fan 2 Control Circuit Low

What it means

The engine control module (ECM) has detected a short to ground or an open circuit in the cooling fan 2 control circuit. This indicates the ECM cannot properly manage the secondary cooling fan or fan clutch speed.