2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2613
P2161
* The transmission is not performing garage shifting.
* The transmission is not in Reverse Inhibit state.
* The transmission is not in PARK or NEUTRAL.
* The engine speed is 1000 RPM or greater.
* No crank sensor or P2160 DTCs.
Conditions for Setting the DTC
P2160
* No speed signal from the transfer case speed sensor.
* The transfer case output shaft speed is 50 RPM or less.
P2161
* Loss of speed signal from the transfer case speed sensor.
* Output speed signal is increasing: current transfer case speed signal - last valid output speed greater than 475 RPM.
* Output speed signal is decreasing: current transfer case speed signal - last valid output speed less than 255 RPM.
Action Taken When the DTC Sets
* DTCs P2160 and P2161 are Type B DTCs.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM calculates vehicle speed from the automatic transmission input shaft speed sensor and commanded gear.
Conditions for Clearing the DTC
DTCs P2160 and P2161 are Type B DTCs.
Diagnostic Aids
* The transfer case drain plug provides a good ground point.
* The EL-49742 - harness provides a good source for 12 V and ground.
* Inspect the rear internal gear teeth for damage.
* Visually inspect the VSS for cracks or damage.
* Ensure the VSS is properly torqued to the transfer case housing.
* This diagnostic relates to the VSS located in the transfer case and not the OSS located within the transmission.
Reference Information
Schematic Reference
* Transfer Case Control Schematics (See: Transmission and Drivetrain/Transfer Case/Diagrams/Electrical Diagrams/MP 3023/3024-NQH -
Transfer Case)
* 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
Transfer Case Description and Operation (See: Transmission and Drivetrain/Transfer Case/Description and Operation/MP 3023/3024-NQH -
Transfer Case/Transfer Case Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
