What causes a P1458 code?

P1458 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 P1458 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1458 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

P1458

EGR output temperature differs from predicted value

What it means

The ECM monitors the temperature of the exhaust gases after they pass through the EGR cooler. P1458 indicates the actual temp sensor reading is higher or lower than what the engine's model predicts based on current load and cooling capacity.