What causes a P2473 code?

P2473 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 P2473 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2473 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

P2473

Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 4

What it means

The Engine Control Module (ECM) has detected an absolute voltage out-of-range or an erratic signal from the EGT sensor located at the DPF/SCR outlet (Sensor 4). This sensor monitors temperature after the aftertreatment components to verify emissions efficiency and protection.