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Circuit/System Description The transfer case control module commands shifts through motor A and motor B control circuits Conditions for Running the DTC The ignition is ON. System voltage is 10.5-18 volts. Conditions for Setting the DTC A shift request was received but could not be completed within 15 seconds causing this An incomplete shift is one that cannot reach the desired mode or range and cannot return to If the shift lever detent shaft were to bind, or there was a mechanical failure, or motor A A faulty transfer case shift control module can cause incorrect incremental sensor or motor Intermittent motor A/B or incremental sensor circuit wiring failures can also cause this DTC Action Taken When the DTC Sets All shifting is disabled until condition is corrected. The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition DTC C0569 4B is set. Conditions for Clearing the DTC The transfer case shift control module clears the DTC if the condition for setting the DTC is Circuit Ground Resistance Voltage Timeout Unable to Complete Shift - - - DTC C0387 59
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Diagnostic Aids Motor control A shorting to motor control B could cause this DTC. Circuit/System Testing 1. If either DTC C0306 or DTC C0396 is set, diagnose these DTCs first. 2. Using a DMM, with the Ignition off, check to see if motor A control and motor B control are shorted together after disconnecting the transfer case control module and the transfer If motor A control is shorted to motor B control repair the circuits as necessary. If the 3. Inspect the actuator connector for damage or corrosion. If corrosion is found then repair the damage and attempt an ATC motor learn
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4. Replace the transfer case shift control module with known good unit and attempt an ATC motor learn. If the ATC motor learn is successful then system is OK, if not then proceed to next 5. Remove the transfer actuator and check to see if the shift detent shaft is binding. If the shift lever detent shaft is binding refer to Transfer Case Disassemble. If the Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Transfer Case Two/Four Wheel Drive Actuator Replacement Transfer Case Disassemble DTC C0396 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 C0396 01 Incremental Position Sensor Circuit Short to Battery DTC C0396 02 Incremental Position Sensor Circuit Short to Ground DTC C0396 04 Incremental Position Sensor Open Circuit DTC C0396 05 Incremental Position Sensor Circuit Short to Battery or Open
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Diagnostic Fault Information Circuit/System Description The transfer case shift control module has an input from incremental sensor which shows the Conditions for Running the DTC The ignition is ON. System voltage is 10.5-18 volts. Conditions for Setting the DTC The transfer case control module sees a incremental 8-volt reference signal that is not The module does not receive a incremental impulse signal voltage between 0.5-4.6 volts. The incremental low reference circuit has an open or high resistance. Action Taken When the DTC Sets All shifting is disabled until the condition no longer exists. The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition Conditions for Clearing the DTC The transfer case shift control module clears the DTC if the condition for setting the DTC is Circuit Short to Ground Open/High Resistance Short to Voltage Signal Invalid Incremental Position Sensor DTC C0396 02 DTC C0396 04 DTC C0396 05 DTC C0396 -
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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