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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (ENGINE CONTROLS - 8.1L - DIAGNOSTICS (DTCs P0506-U0107)) >> DTC P2120 >> Circuit Description

Circuit Description

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The accelerator pedal position (APP) sensor 1 is a potentiometer type sensor with the following three circuits:

The control module provides the APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensor then provides the control module a signal voltage proportional to pedal movement. The APP sensor 1 signal voltage is low at rest and increases as the pedal is depressed. When the control module detects that the APP sensor 1 signal or APP sensor 5-volt reference voltage is outside the predetermined range, this DTC sets.