What causes a P1869 code?

P1869 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 P1869 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1869 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

P1869

Fuel temperature sensor out of range low

What it means

The Engine Control Module (ECM) detects that the fuel temperature sensor signal voltage is below the minimum acceptable threshold, typically indicating a short circuit to ground.