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DTC P0168: Fuel Rail Temperature Sensor High: Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The Fuel Rail Temperature (FRT) sensor is a thermistor type sensor. The Engine Control Module (ECM) supplies 5 volts and a ground circuit to the sensor. When the ECM detects a FT above a pre-determined value, a type C code, no Malfunction Indicator Lamp (MIL) sets. A fuel cooler located in front of the fuel tank is used to help keep the fuel temperature at an acceptable limit.

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