What causes a P0549 code?

P0549 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 P0549 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0549 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

P0549

Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 2

What it means

The Engine Control Module (ECM) detects an abnormally high voltage signal from the Exhaust Gas Temperature (EGT) sensor located after the Diesel Oxidation Catalyst (DOC) or Diesel Particulate Filter (DPF).