What causes a P1874 code?

P1874 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 P1874 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1874 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

P1874

Turbocharger compressor temperature sensor out of range high

What it means

The Engine Control Module (ECM) detects that the voltage signal from the Turbocharger Compressor Outlet Temperature sensor is higher than the maximum allowable calibrated limit, suggesting an overheating condition or a circuit malfunction.