2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2478
Circuit/System Description
The accelerator pedal assembly contains 2 accelerator pedal position (APP) sensors. The APP sensors are mounted to the accelerator pedal
assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to pedal position. The engine control module
(ECM) supplies each APP sensor with a 5 V reference circuit, a low reference circuit, and a signal circuit.
Conditions for Running the DTC
P2120, P2122, P2123, P2125, P2127, P2128
* DTC P0641 or P0651 is not set.
* The ignition is ON or the engine is running.
* The run/crank or powertrain relay voltage is greater than 6.0 V and reduced power is not active.
* DTC P2120, P2122, P2123, P2125, P2127, P2128 run continuously when the above conditions are met.
P2138
* DTC P0641, P0651, P2120, P2125 are not set.
* The ignition is ON or the engine is running.
* The run/crank or powertrain relay voltage is greater than 6.0 V and reduced power is not active.
* DTC P2138 runs continuously when the above conditions are met.
Conditions for Setting the DTC
P2120
The APP sensor 1 voltage is less than 0.46 V or greater than 4.7 V for greater than 0.2 s.
P2122
The ECM detects that the APP sensor 1 voltage is less than 0.46 V for greater than 0.2 s.
P2123
The ECM detects that the APP sensor 1 voltage is greater than 4.75 V for greater than 0.2 s.
P2125
The APP sensor 2 voltage is less than 0.32 V or greater than 2.6 V for greater than 0.2 s.
P2127
The ECM detects that the APP sensor 2 voltage is less than 0.32 V for greater than 0.2 s.
P2128
The ECM detects that the APP sensor 2 voltage is greater than 2.6 V for greater than 0.2 s.
P2138
The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for greater than 1 s.
Action Taken When the DTC Sets
* DTCs P2120, P2122, P2123, P2125, P2127, P2128, and P2138 are Type A DTCs.
