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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 565 (Instrument Panel, Gauges & Console) >> Diagnostic Information and Procedures >> DTC P1665: Fuel Level Signal Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The fuel level sensor changes resistance based on the fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the fuel level sensor resistance is high and the PCM senses a high fuel level sensor signal voltage. When the fuel tank is empty, the fuel level sensor resistance is low and the PCM senses a low fuel level sensor signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percentage via the fuel level signal circuit to the instrument panel cluster (IPC) in order to control the fuel gage.

The PCM sets this DTC if the fuel level signal circuit to the IPC becomes open, shorted to voltage, or shorted to ground.

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