What causes a P0185 code?

P0185 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 P0185 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0185 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

P0185

P0185 Fuel Temperature Sensor B Circuit Malfunction

What it means

The Engine Control Module (ECM) has detected an out-of-range signal or a circuit failure from the secondary fuel temperature sensor (Sensor B). This sensor monitors fuel density and temperature to calibrate fuel delivery and timing.