2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 895

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 895

solenoid energized, the test light should illuminate.

瀚慖f the test light stays ON when the lock is commanded ON, test the lock solenoid control circuit for a short to ground. If all circuits and

connections test normal, reprogram the TCCM. If the DTC continues to set replace the TCCM.

瀚慖f the test light does not illuminate when the lock is commanded OFF, test the lock control solenoid circuit for an open or short to voltage.

If all circuits and connections test normal, reprogram the TCCM. If the DTC continues to set replace the TCCM.

7. Test the TCEM.

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 TCSCM replacement, setup, and programming

* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related

Diagnostic Procedures/MP 3010-NP0/Transfer Case High/Low Clutch Reset)

* Transfer Case Two/Four Wheel Drive Actuator Position Sensor Replacement (See: Powertrain Management/Transmission Control

Systems/Actuators and Solenoids - Transmission and Drivetrain/Actuators and Solenoids - Transfer Case/Transfer Case Actuator/Service and

Repair/MP 3010-NP0 - Transfer Case/Transfer Case Two/Four Wheel Drive Actuator Position Sensor Replacement)

* Transfer Case Disassemble (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 - Transfer

Case/Transfer Case Disassemble)

* Transfer Case Assemble (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 - Transfer

Case/Transfer Case Assemble)

* Oil Pump Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 - Transfer

Case/Oil Pump Cleaning and Inspection)

* Rear Output Shaft Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 -

Transfer Case/Rear Output Shaft Cleaning and Inspection)

* Front Output Shaft and Input Shaft Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and

Repair/Overhaul/MP 3010-NP0 - Transfer Case/Front Output Shaft and Input Shaft Cleaning and Inspection)

* Drive Chain, Drive Sprocket, and Driven Sprocket Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and

Repair/Overhaul/MP 3010-NP0 - Transfer Case/Drive Chain, Drive Sprocket, and Driven Sprocket Cleaning and Inspection)

* High/Low Shift Components Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP

3010-NP0 - Transfer Case/High/Low Shift Components Cleaning and Inspection)

* Two/Four Wheel Drive Shift Components Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and

Repair/Overhaul/MP 3010-NP0 - Transfer Case/Two/Four Wheel Drive Shift Components Cleaning and Inspection)

* Transfer Case Front Half Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP

3010-NP0 - Transfer Case/Transfer Case Front Half Cleaning and Inspection)

* Transfer Case Rear Half Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP

3010-NP0 - Transfer Case/Transfer Case Rear Half Cleaning and Inspection)

MP 3023/3024-NQH - Transfer Case

DTC C0321

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 C0321 01

- Transfer Case Module Lock Circuit Short to Battery

DTC C0321 02

- Transfer Case Module Lock Circuit Short to Ground

DTC C0321 04

- Transfer Case Module Lock Circuit Open

DTC C0321 08

- Transfer Case Module Lock Circuit Signal Invalid

Diagnostic Fault Information