2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2696

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2696

10. Ignition ON, test for 11-13 volts between terminal F on the K71 TCM and ground at the transmission case.

瀚慖f not within the specified range, replace the Q8 control solenoid valve assembly.

11. If all circuits test normal, replace the B15 automatic transmission internal mode switch.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Control Module References (See: Testing and Inspection/Programming and Relearning)for control solenoid valve assembly or ECM

replacement, setup, and programming.

Note: If the IMS switch has been replaced, inspect the valve body detent spring to be sure it is centered over the detent lever. This prevents

the detent spring from hitting the IMS switch.

* Manual Shift Shaft Position Switch Replacement (See: Powertrain Management/Computers and Control Systems/Sensors and Switches -

Computers and Control Systems/Transmission Position Sensor/Switch/Service and Repair/6L45/6L50/6L80/6L90 - Automatic Transmission

)for IMS replacement.

P0851

DTC P0850-P0852

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptors

DTC P0850

- Park/Neutral Position (PNP) Switch Circuit

DTC P0851

- Park/Neutral Position (PNP) Switch Circuit Low Voltage

DTC P0852

- Park/Neutral Position (PNP) Switch Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The transmission manual shift shaft switch assembly, also known as the internal mode switch (IMS), is a sliding contact switch attached to the

manual shift shaft inside the transmission case. The park/neutral position (PNP) switch is integrated into the IMS and connects to the transmission

control module (TCM) lead-frame through a short wire harness. The circuit uses the TCM as a pass-through connector only.

The Park/Neutral Signal is sent from the park/neutral switch directly to the engine control module (ECM) and is used for engine start enable.

Conditions for Running the DTC