What causes a P1523 code?

P1523 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 P1523 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1523 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

P1523

Oil pressure too high

What it means

The Engine Control Module (ECM) detects that the oil pressure signal voltage exceeds the maximum calibrated threshold for current engine operating conditions.