2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2814

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2814

DTC P1838

- Internal Mode Switch A Circuit High Voltage

DTC P1839

- Internal Mode Switch C Circuit Low Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Transmission Internal Mode Switch Logic

Circuit/System Description

The automatic transmission manual shift shaft position switch assembly, also called the internal mode switch (IMS) assembly, is a dual sliding

contact switch attached to the control valve body within the transmission. The 9 outputs from the switch indicate which position is selected by the

transmission manual shaft. Four outputs (A, B, C, P) are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2,

D1, D2, S) are direction selection inputs to the hybrid powertrain control module (HPCM). The input voltage at the modules is high when the

switch is open and low when the switch is closed to ground. The state of each input is displayed on the scan tool as IMS Range and IMS Direction.

The IMS Range input parameters represented are transmission range signal A, signal B, signal C, and signal P. The IMS Direction input parameters

represented are transmission direction signal R1, signal R2, signal D1, signal D2, and signal Start.

Conditions for Running the DTC

* No OSS DTCs P0722 or P077B.

* The system voltage is 11-18 volts.

P182E

* The engine run time is greater than 5 seconds.

* The system voltage is 11-18 volts.

* The vehicle speed is less than 200 km/h (124 mph) for 5 seconds.

Conditions for Setting the DTC

Any one or more of the following conditions:

* The IMS signal circuit A, B, or P are Low in Park for greater than 8 seconds.

* The IMS signal circuit A is Low in D for 8 seconds.

* The IMS signal circuit C is High in D for 8 seconds.