2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1672
Cover Replacement).
7. Connect the TCM harness connector.
8. Disconnect the IMS connector at the control solenoid valve assembly.
9. Ignition ON, verify the scan tool IMS A/B/C/P parameter displays HI for all four signal circuits.
瀚慖f not the specified value, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control
Module Assembly Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids - Transmission
and Drivetrain/Actuators and Solenoids - A/T/Shift Solenoid/Service and Repair).
10. Verify the scan tool ECM PNP Switch parameter displays In Gear.
瀚慖f not the specified value, replace the control solenoid valve assembly.
11. Connect a 3-amp fused jumper wire between each transmission range signal circuit terminal listed below and the IMS ground circuit,
terminal A. Verify the corresponding scan tool IMS A/B/C/P parameter displays LOW when terminals E, D, C, and B are connected to the
IMS ground and the ECM PNP Switch parameter displays Park/Neutral when terminal F is connected to ground.
* Switch Signal A terminal E
* Switch Signal B terminal D
* Switch Signal C terminal C
* Switch Signal P terminal B
* PNP Switch Signal terminal F
瀚慖f not the specified value, replace the control solenoid valve assembly.
12. If all circuits test normal, replace the IMS.
Repair Instructions
Important:
* Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and
Inspection/Programming and Relearning) following all transmission related repairs.
* 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 ECM or control solenoid valve assembly
replacement, setup, and programming
* Range Selector Lever Cable Adjustment (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Shift Linkage/Shift
Cable/Adjustments)
* Control Valve Body Cover Replacement (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Valve Body/Service and
Repair/6T70/6T75 - Automatic Transmission/Control Valve Body Cover Replacement)
* Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (See: Powertrain Management/Computers and Control
Systems/Sensors and Switches - Computers and Control Systems/Transmission Position Sensor/Switch/Service and Repair)
P0852
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
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