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Action Taken When the DTC Sets The SERVICE 4WD indicator is not commanded on for this DTC. Conditions for Clearing the DTC The transfer case shift control module clears the DTC if the condition for setting the DTC is 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 Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Scan Tool Data List Scan Tool Data Definitions Diagnostic Aids A short to ground on the 4 high indicator control circuit will cause the 4 high indicator to remain Circuit/System Testing
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Check the interior dimming circuit pin 2 at the transfer case shift control switch for voltage for If less than battery voltage check the interior lights dimming circuit for an open or high If the 4 high indicator is on at all times check the 4 high indicator control circuit for a short With the ignition on shift the transmission to neutral and using transfer case output controls Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Transfer Case Shift Control Switch Replacement (Without SLT) or Transfer Case Control Module References for TCSCM replacement, setup, and programming Transfer Case High/Low Clutch Reset DTC B0780 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 B0780 01 4 High Indicator Circuit Short to Battery
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DTC B0780 06 4 High Indicator Circuit Short to Ground or Open Diagnostic Fault Information Circuit/System Description The 4 low indicator circuit consists of an interior lights dimming circuit and an 4 low indicator 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 low indicator control circuit. If the system detects a voltage of 2 volts or less for 1.5 seconds when the 4 low indicator is If the system detects a voltage of 4.5 volts or more when the 4 low indicator is commanded, Action Taken When the DTC Sets The SERVICE 4WD indicator is not commanded on for this DTC. Conditions for Clearing the DTC The transfer case shift control module clears the DTC if the condition for setting the DTC is A history DTC clears after 40 consecutive warm up cycles without a fault present. Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance 4 High Indicator Circuit DTC B0780 06 DTC B0780 06 DTC B0780 -
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Scan Tool Data List Scan Tool Data Definitions Diagnostic Aids A short to ground on the 4 low indicator control circuit will cause the 4 low indicator to remain Circuit/System Testing Check the interior dimming circuit pin 2 at the transfer case shift control switch for voltage for If less than battery voltage check the interior lights dimming circuit for an open or high If the 4 low indicator is on at all times check the 4 low indicator control circuit for a short
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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