What causes a P1298 code?

P1298 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 P1298 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1298 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

P1298

Oil system temperature high monitor fault data

What it means

The ECM has detected that the engine oil temperature has exceeded the maximum safe operating limit.This is a 'data erratic' or 'above normal' fault specifically monitoring temperature protection.