What causes a P1751 code?

P1751 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 P1751 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1751 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

P1751

MIL lamp driver short circuit to battery fault

What it means

The Engine Control Module (ECM) has detected that the voltage on the Malfunction Indicator Lamp (MIL) control circuit is higher than expected when the lamp should be OFF, indicating a short circuit to battery voltage.