What causes a P0188 code?

P0188 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 P0188 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0188 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

P0188

Fuel Temperature Sensor B Circuit High Input

What it means

The Engine Control Module (ECM) detects an abnormally high voltage signal from the secondary fuel temperature sensor, indicating an open circuit or short to power.