Circuit Description
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
The accelerator pedal position (APP) sensor 2 is a potentiometer type sensor with the following circuits:
- A 5-volt reference circuit
- A low reference circuit
- A signal circuit
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.
This DTC incorporates the following diagnostic tests:
- The APP sensor 2 signal circuit voltage out of range
- The accelerator pedal minimum position for the APP sensor 2 out of range
- The 5-volt reference of the APP sensor 2 tests out of range
If the powertrain control module (PCM) detects one or more of the APP sensor 2 tests are out of range, DTC P2125 sets.