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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 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 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 - This function allows the technician to command the 4WD High - This function allows the technician to command the 4WD Low - This function allows the technician to command the ATC Motor Learn - This function allows the technician to command the Neutral Indicator - This function allows the technician to command the
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, 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 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
SCAN TOOL DATA DEFINITIONS 2WD High Indicator Light This parameter displays On when the transfer case shift control module commands the 2WD 4WD High Indicator Light This parameter displays On when the transfer case shift control module commands the 4WD 4WD Low Indicator Light Mode Switch Return Transfer Case Data Volts Varies Mode Switch Selected Transfer Case Data Auto 4WD/2 High/4High/4 Low/Neutral 2 High Mode Switch Supply Transfer Case Data Volts 5 Volts Neutral Indicator Light Transfer Case Data On/Off Off Run/Crank Transfer Case Data Active/Inactive Active Software Part Number Transfer Case Data GM Part Number Current Software Release Transfer Case Lock Transfer Case Data Engaged/Disengaged Disengaged Transfer Case Motor Transfer Case Data Amperage 0 Amps Transfer Case Position Transfer Case Data Current Transfer Case Mode or Range 2 High Trans. Fluid Temp Transfer Case Data Degrees C Varies TR Switch Status Transfer Case Data Current Transmission Gear Park Vehicle Speed Transfer Case Data km/h Varies
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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