2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 952

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 952

* The TCM runs the program to detect an internal condition at key ON. The only requirements are voltage and ground.

* Ignition ON.

* System voltage 10.5-18 V.

Conditions for Setting the DTC

* The random access memory (RAM) of the TCCM has failed an operational test indicating that some portions of RAM are not functional.

* The read only memory (ROM), or the masked ROM, of the TCCM has failed the Checksum test indicating that the data is not currently valid.

* The critical operational parameters stored in the EEPROM of the TCCM have failed the Checksum test indicating invalid data.

Action Taken When the DTC Sets

* The encoder motor will be deactivated for the remainder of the current ignition cycle.

* The transfer case shift control switch will illuminate the current mode position LED.

* No further mode changes shall be allowed.

* The TCCM will store freeze frame data.

* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

Conditions for Clearing the DTC

* The TCCM will clear the DTC once the conditions for setting the DTC are no longer present.

* A history DTC clears after 40 consecutive warm up cycles without a fault present.

* History DTCs can be cleared using a scan tool.

Diagnostic Aids

* DTC P0550 detects the wrong copy of non-volatile memory in RAM or a RAM read/write failure.

* DTC P0550 detects a non-volatile memory write error.

* DTC P0550 detects a corruption of the EPROM/Flash memory.

* When attempting to set TCCM internal DTCs, let the engine run for at least 1 minute and then shut the engine OFF for 30 seconds.

Following this procedure will allow for a complete TCCM shutdown. Reprogram the TCCM and retest the DTC to see if the DTC resets.

* A low voltage condition can sometimes falsely set this DTC. Attempt to clear this DTC and retest.

Reference Information

Schematic Reference

Transfer Case Control Schematics (See: Transmission and Drivetrain/Transfer Case/Diagrams/Electrical Diagrams/MP 3010-NP0 - Transfer Case)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Transfer Case Description and Operation (See: Transmission and Drivetrain/Transfer Case/Description and Operation/MP 3010-NP0/Transfer

Case Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.

Circuit/System Verification

1. Engine running. Let the engine run for at least 1 minute.

2. Ignition OFF for at least 30 seconds to allow for the complete shutdown of the TCCM.

3. Ignition ON, verify that DTC C0550 is not set.

瀚慖f DTC C0550 sets, reprogram the TCCM. If the DTC resets, replace the TCCM. Perform the ATC motor learn procedure.