What causes a P0474 code?

P0474 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 P0474 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0474 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

P0474

Exhaust Pressure Sensor Circuit Intermittent

What it means

The Engine Control Module (ECM) detects an erratic or intermittent voltage signal from the exhaust back pressure sensor which does not match predefined operating maps.