What causes a P2479 code?

P2479 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 P2479 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2479 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

P2479

Exhaust Gas Temperature Out of Range During Regeneration

What it means

The engine control module (ECM) detects that the exhaust gas temperature (EGT) sensor 1 for Bank 1 is not reaching or maintaining the target temperature required to complete a Diesel Particulate Filter (DPF) regeneration.