2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1667

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1667

* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (See: Transmission

and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/6T70/6T75 - Automatic

Transmission/Control Solenoid Valve and Transmission Control Module Assembly Inspection).

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 replacement, setup, or

programming

P0850

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

* Ignition voltage is between 8-18 volts.

* Engine speed is greater than 1000 RPM.

Conditions for Setting the DTC

P0850 and P0851

* The ECM detects the Park/Neutral switch signal equals 0 volts (Park/Neutral) when the IMS reports a Drive range for 0.2 second.

* TP is equal to or greater than 10 percent.

* Engine torque is equal to or greater than 75 Nm (55 lb ft).

* Vehicle speed is equal or greater than 10 km/h (6 mph).