Chevrolet Silverado / GMC Sierra. Service manual — part 2922

Circuit/System Description

This DTC indicates and RAM/ROM checksum, a EEPROM failure, or an ECU malfunction due
to an internal microprocessor failure.

Conditions for Running the DTC

The ignition is ON.

System voltage is 10.5-18 volts.

Conditions for Setting the DTC

The EEPROM, RAM and ROM, and ECM Microprocessor do self checks against one another
and the data does not match causing the DTC to set.

Action Taken When the DTC Sets

Shifting is still disabled until the DTC has cleared itself.

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

Conditions for Clearing the DTC

The transfer case shift control module clears the DTC if the condition for setting the DTC is
not currently present.

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

History DTCs can be cleared using a scan tool.

Reference Information

Schematic Reference

Transfer Case Control Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Scan Tool Data Definitions

Diagnostic Aids

It is sometimes possible to set this DTC falsely due to low voltage. Attempt to clear this DTC and
retest.

Circuit/System Testing

If this DTC sets attempt to clear the DTC and Retest.

If the DTC is cleared, but then resets then replace the transfer case control module,
program, and complete the transfer case motor learn procedure.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for TCSCM replacement, setup, and programming

Transfer Case High/Low Clutch Reset

DTC C0569

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0569 4B

System Configuration Error Calibration Data Not Learned

Diagnostic Fault Information

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Circuit/System Description

This DTC is set anytime a new transfer case shift control module is installed. The transfer case
motor learn procedure must be performed to erase this DTC. The DTC must learn the amount of
clutch tolerance depending on clutch stackup and the amount of wear the clutches have
accumulated.

Conditions for Running the DTC

The ignition is ON.

System voltage is 10.5-18 volts.

Conditions for Setting the DTC

The motor learn procedure for a new module has not been performed.

Action Taken When the DTC Sets

Shifting is still disabled until the motor learn procedure has been performed.

The SERVICE 4WD indicator does not light for this DTC.

Conditions for Clearing the DTC

The transfer case shift control module clears the DTC if the motor learn procedure has been
successfully performed.

Reference Information

Schematic Reference

Transfer Case Control Schematics

Connector End View Reference

Component Connector End Views

Circuit

Short to

Ground

Open/High

Resistance

Watchdog/Safety

Failure

Internal

Electronic

Failure

Electronic Control Unit
Malfunction

-

-

DTC C0550 39

DTC C0550

39

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Scan Tool Data Definitions

Diagnostic Aids

Perform the motor learn procedure before normal operation will occur.

Circuit/System Testing

Perform the motor learn procedure.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Transfer Case High/Low Clutch Reset

DTC C0896

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0896 03

Device Voltage Range Voltage Below Threshold

DTC C0896 07

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado