Chevrolet Silverado / GMC Sierra. Service manual — part 2866

11

Transfer Case Two/Four Wheel Drive Shift Fork Insert

12

Transfer Case Shift Fork Spring

13

Transfer Case Two/Four Wheel Drive Shift Fork Assembly

14

Transfer Case Two/Four Wheel Drive Actuator Cam

15

Transfer Case Two/Four Wheel Drive Actuator Cam Retaining Ring

16

Transfer Case High/Low Shift Fork

17

Transfer Case High/Low Shift Fork Pads

18

Transfer Case High/Low Shift Fork Spring Assembly

19

Transfer Case High/Low Shift Fork Pin

20

Transfer Case Control Actuator Shaft

21

Transfer Case Rear Output Shaft

22

Transfer Case Two/Four Wheel Drive Synchronizer Inserts

23

Transfer Case Two/Four Wheel Drive Synchronizer Hub

24

Transfer Case Two/Four Wheel Drive Synchronizer Assembly

25

Transfer Case Two/Four Wheel Drive Synchronizer Blocking - Outer -
Ring

26

Transfer Case Two/Four Wheel Drive Synchronizer Blocking - Inner -
Ring

27

Transfer Case Front Output Shaft Drive Chain Assembly

28

Transfer Case Front Output Shaft Drive Sprocket

29

Transfer Case Front Output Shaft Drive Sprocket Bearing Assembly

30

Transfer Case Front Output Shaft Drive Sprocket Spacer - Rear

31

Transfer Case Front Output Shaft Drive Sprocket Retaining Ring

32

Transfer Case Oil Pump Assembly

33

Transfer Case Rear Output Shaft Speed Reluctor Wheel

34

Transfer Case Rear Output Shaft Rear Bearing Retaining Ring

35

Transfer Case Rear Output Shaft Rear Bearing Assembly

36

Transfer Case Rear Output Shaft Rear Bearing Retaining Ring

37

Transfer Case Oil Pump Suction Pipe Seal

38

Transfer Case Oil Pump Suction Pipe

39

Transfer Case Front Output Shaft Rear Bearing Assembly

40

Transfer Case Front Output Shaft Driven Sprocket Spacer

41

Transfer Case Front Output Shaft Driven Sprocket

42

Transfer Case Front Output Shaft Hole Plug

43

Transfer Case Front Output Shaft

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

44

Transfer Case Front Output Shaft Front Bearing Assembly

DTC

Description

DTC B0775

B0775 01: 4 High Indicator Circuit Short to Battery

B0775 06: 4 High Indicator Circuit Short to Ground or Open

DTC B0780

B0780 01: 4 High Indicator Circuit Short to Battery

B0780 06: 4 High Indicator Circuit Short to Ground or Open

DTC B0785

B0785 01: 2 High Indicator Circuit Short to Battery

B0785 06: 2 High Indicator Circuit Short to Ground or Open

DTC B0790

B0790 01: Neutral Indicator Circuit Short to Battery

B0790 06: Neutral Indicator Circuit Short to Ground or Open

DTC B2725

B2725 08: Active Transfer Case Mode Switch Circuit

DTC C0306

C0306 02: Motor A or B Circuit Short to Ground

C0306 05: Motor A or B Circuit Short to Battery or Open

DTC C0379

C0379 01: Front Axle System Short to Battery

C0379 02: Front Axle System Short to Ground

C0379 04: Front Axle System Open Circuit

C0379 08: Front Axle System Signal Invalid

DTC C0387

C0387 59: Unable to Complete Shift Circuit/Component

Protection Timeout

DTC C0396

C0396 01: Incremental Position Sensor Circuit Short to Battery

C0396 02: Incremental Position Sensor Circuit Short to

Ground

C0396 04: Incremental Position Sensor Open Circuit

C0396 05: Incremental Position Sensor Circuit Short to Battery

or Open

DTC C0550

C0550 37: Electronic Control Unit Malfunction

Watchdog/Safety Failure

C0550 39: Electronic Control Unit Malfunction Internal

Electronic Failure

DTC C0569

C0569 4B: System Configuration Error Calibration Data Not

Learned

DTC C0896

C0896 03: Device Voltage Range Voltage Below Threshold

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

DIAGNOSTIC STARTING POINT - TRANSFER CASE

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic
System Check will provide the following information:

The identification of the control module or modules that command the system.

The ability of the control module or modules to communicate through the serial data circuit.

The identification of any stored diagnostic trouble codes (DTCs) and the status of the codes.

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for
diagnosing the system and where the procedure is located.

SCAN TOOL OUTPUT CONTROLS

C0896 07: Device Voltage Range Voltage Above Threshold

DTC P2160 or P2161

P2160: Vehicle Speed Sensor (VSS) 2 Circuit Low Voltage

P2161: Vehicle Speed Sensor (VSS) 2 Circuit Intermittent

Scan Tool

Output Control

Additional Menu

Selections

Description

Refer to the scan tool manual for complete scan tool operating instructions.

IMPORTANT:

Transmission must be in transmission neutral for any of these output controls to operate.

2WD High
Indicator Light

-

This function allows the technician to command the
2WD high indicator light, within the transfer case
shift control switch, on or off.

4WD High
Indicator Light

-

This function allows the technician to command the
4WD high indicator light, within the transfer case
shift control switch, on or off.

4WD Low
Indicator Light

-

This function allows the technician to command the
4WD low indicator light, within the transfer case
shift control switch, on or off.

ATC Motor Learn -

This function allows the technician to command the
transfer case shift control module to relearn the
clutch status after the encoder motor, module, or
transfer case is replaced.

Neutral Indicator

-

This function allows the technician to command the
neutral indicator light, within the transfer case shift

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

SCAN TOOL DATA LIST

Light

control switch, on or off.

Scan Tool Parameter

Data List

Units Displayed

Typical Data

Value

Operating Conditions: Engine is at idle, upper radiator hose is hot, closed throttle,
gear is in Park or Neutral, and accessories are OFF.

2WD High Indicator Light

Transfer Case

Data

On/Off

ON

4WD High Indicator Light

Transfer Case

Data

On/Off

Off

4WD Low Indicator Light

Transfer Case

Data

On/Off

Off

Accessory Status

Transfer Case

Data

Not Active/Active

Active

ATC Motor Init. Test

Transfer Case

Data

Not

Initialized/Passed/Failed/In

Progress

Passed

Battery Voltage

Transfer Case

Data

Volts

Battery Voltage

Clutch Calibration Status

Transfer Case

Data

Not Learned/Initial

Learn/Normal Learn

Normal Learn

Front Axle Actuator

Transfer Case

Data

Volts

Battery Voltage

Front Axle Actuator Status

Transfer Case

Data

Engaged/Disengaged

Disengaged

Front Axle Switch

Transfer Case

Data

Locked/Unlocked

Unlocked

Incremental Impulse Sensor

Transfer Case

Data

PWM Voltage

Varies

Incremental Position Sensor
Direction

Transfer Case

Data

Clockwise/Counter

Clockwise

Varies

Incremental Position Sensor

Transfer Case

Data

Degrees

Varies

Incremental Position Sensor

Transfer Case

Data

Volts

Varies

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado