What causes a P0484 code?

P0484 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 P0484 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0484 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

P0484

Cooling Fan Control Circuit Excessive Current

What it means

The engine control module (ECM) provides a pulse width modulated signal to the fan clutch or motor; this code triggers when the circuit experiences an over-current condition.