What causes a P1457 code?

P1457 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 P1457 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1457 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

P1457

EGR / EGR cooler temperature high warning

What it means

The engine control module (ECM) detects that the exhaust gas temperature downstream of the EGR cooler is exceeding the calibrated threshold, indicating the cooler is not sufficiently dropping gas temperatures.