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Chevrolet Silverado / GMC Sierra. Manual - part 2867
This parameter displays On when the transfer case shift control module commands the 4WD
low indicator light On. The scan tool displays On or Off.
Accessory Status
This parameter displays Not Active, and Active.
ATC Motor Init. Test
This parameter displays Not Initialized, Passed, Failed, or in Progress when the key off
initialization sequence has occurred.
Battery Voltage
This parameter displays the voltage measured by the transfer case shift control module at the
transfer case shift control module battery feed. The scan tool displays a range of 0-25.5
volts.
Front Axle Actuator
This parameter displays the voltage input to the front axle actuator from 0 - 25 volts.
Front Axle Actuator Status
This parameter displays either disengaged or engaged, engaged when the system is in Auto
4WD, 4WD, or 4WD Low modes, and disengaged when the mode is in neutral, or 2WD
mode.
Front Axle Switch
This parameter displays either locked or unlocked depending on the feedback from the front
axle actuator switch, which will be battery voltage when the vehicle is in a 4WD or Auto
4WD mode.
Incremental Impulse Sensor
This parameter displays the direction the incremental sensor is moving as clockwise or
counter clockwise.
Incremental Position Sensor Direction
This parameter displays the pulse width modulated voltage signal being supplied to the
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
incremental sensor via the transfer case control module.
Incremental Position Sensor
This parameter displays the position of the incremental sensor in degrees.
Incremental Position Sensor
This parameter displays the position of the incremental sensor in incremental sensor return
voltage.
Mode Switch Return Voltage
This parameter displays the transfer case shift control switch return voltage from 0-7.5 volts.
Mode Switch Selected
This parameter displays the transfer case shift control switch mode currently selected by the
driver.
Mode Switch Selected
This parameter displays the voltage being supplied to the transfer case shift control switch
by the transfer case control module from 0-7.5 volts.
Neutral Indicator Light
This parameter displays On when the transfer case shift control module commands the
neutral indicator light On. The scan tool displays On or Off.
Run/Crank
This parameter displays the status of the run/crank signal to the transfer case control module
as active or inactive.
Transfer Case Motor
This parameter displays the current draw in amperage that the motor is currently drawing
from the transfer case control module.
Transfer Case Position
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
This parameter displays the current mode the transfer case is in as indicated by the transfer
case control module.
Trans. Fluid Temp.
This parameter displays the transmission fluid temperature in degrees Celsius.
TR Switch Status
This parameter displays the current gear the transmission is in.
Vehicle Speed
This parameter displays vehicle speed in kilometers per hour.
Software Part Number
This parameter displays the numbers or characters assigned to the current version of
software used in the transfer case shift control module. The scan tool displays an
alphanumeric value.
DIAGNOSTIC TROUBLE CODE (DTC) LIST
DTC B0775
Diagnostic Instructions
DTC
Modules
DTC B0775
Electronic Transfer Case
DTC B0780
Electronic Transfer Case
DTC B0785
Electronic Transfer Case
DTC B0790
Electronic Transfer Case
DTC B2725
Electronic Transfer Case
DTC C0306
Electronic Transfer Case
DTC C0379
Electronic Transfer Case
DTC C0387
Electronic Transfer Case
DTC C0396
Electronic Transfer Case
DTC C0550
Electronic Transfer Case
DTC C0569
Electronic Transfer Case
DTC C0896
Electronic Transfer Case
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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 B0775 01
4 High Indicator Circuit Short to Battery
DTC B0775 06
4 High Indicator Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit/System Description
The 4 high indicator circuit consists of an indicator lamp feed circuit and an 4 high indicator lamp
control circuit. When the 4 high mode has been selected, current is supplied to the 4 high
indicator lamp by the interior lights dimming circuit, traveling through the 4 high indicator lamp
LED, at which time the transfer case shift control module supplies the ground through the 4 high
indicator lamp control circuit.
Conditions for Running the DTC
The ignition is ON.
System voltage is 10-18 volts.
Conditions for Setting the DTC
The system monitors the voltage on the 4 high indicator control circuit.
If the system detects a voltage of 2 volts or less for 1.5 seconds when the 4 high indicator is
not commanded, the DTC is logged.
If the system detects a voltage of 4.5 volts or more when the 4 high indicator is commanded,
the DTC is logged.
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
4 High Indicator Circuit
DTC B0775
06
DTC B0775
06
DTC B0775
01
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2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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