P1281 BUICK, CADILLAC, CHEVROLET, GMC: ACCELERATOR PEDAL POSITION SENSOR 2 PERFORMANCE
POST UPDATED IN May, 2023
P1281 BUICK, CADILLAC, CHEVROLET, GMC: ACCELERATOR PEDAL POSITION SENSOR 2 PERFORMANCE
Nowadays, modern vehicles have an electrical system that controls the accelerator, which includes the APP or better known as Accelerator Pedal Position Sensor. Its main function is to monitor the position of the accelerator pedal. Consequently, it sends a voltage signal that allows the throttle body to open while the pedal is depressed.
The APP sensor, which is installed inside the Throttle Control Module (TAC) assembly, basically tells the engine how fast should drive while the accelerator pedal is depressed. When the pedal is depressed or released, an electrical signal is sent to the Engine Control Module or ECM. Then, that signal is sent to the fuel system. There are three individual APP sensors inside the TAC Module. Three separate signal circuits, low reference circuits, and 5-volt reference circuits determine the throttle position. As the accelerator pedal is depressed, the APP Sensor signal voltages increase.
The OBDII fault code P1281 is a specific code, which for Buick, Cadillac, Chevrolet, and GMC manufacturers are used to indicate that the Throttle Pedal Position Sensor 2 has experienced performance problems.
Reasons to set the P1281 OBD2 diagnostic code:
To troubleshoot the DTC P1281 OBDII code, try this: