2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2865
Conditions for Running the DTC
P2120, P2122, P2123, P2125, P2127, P2128
* DTC P0641 and P0651 are not set.
* The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active.
* The ignition is in the Unlock/Accessory or Run position.
* 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 system voltage is greater than 5.23 V.
* The ignition is in the Unlock/Accessory or Run position.
* DTC P2138 runs continuously when the above conditions are met.
Conditions for Setting the DTC
P2120
The APP sensor 1 voltage is less than 0.325 V, or greater than 4.75 V for greater than 0.4 s.
P2122
The ECM detects that the APP sensor 1 voltage is less than 0.325 V for greater than 0.4 s.
P2123
The ECM detects that the APP sensor 1 voltage is greater than 4.75 V for greater than 0.4 s.
P2125
The APP sensor 2 voltage is less than 0.325 V, or greater than 4.75 V for greater than 0.4 s.
P2127
The ECM detects that the APP sensor 2 voltage is less than 0.325 V for greater than 0.4 s.
P2128
The ECM detects that the APP sensor 2 voltage is greater than 4.75 V for greater than 0.4 s.
P2138
The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for greater than 2 s.
Action Taken When the DTC Sets
* DTCs P2120, P2122, P2123, P2125, P2127, P2128, and P2138 are Type A DTCs.
* The control module commands the TAC system to operate in the Reduced Engine Power mode.
* A message center or an indicator displays Reduced Engine Power.
* Under certain conditions the control module commands the engine OFF.
Conditions for Clearing the MIL/DTC
DTCs P2120, P2122, P2123, P2125, P2127, P2128, and P2138 are Type A DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Throttle Actuator Control (TAC) System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Throttle Actuator Control (TAC) System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
