Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
There is an actuator solenoid in the lower right diff. housing that usually causes this problem.Here is a picture of the solenoid .Make sure all codes have been cleared.
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
Inspect for proper differential fluid level. Verify the fault is present.
Does the system operate normally?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
Does the voltage measure within the specified value?
Go to Step 4
Go to Step 7
Does the test lamp illuminate?
Go to Step 5
Go to Step 8
Important: The differential clutch pump actuator check valve duty cycle will initiate at 49-90 percent duty cycle for 3 seconds, then drop to 16-28 percent duty cycle. Every 30 seconds, the duty cycle will cycle up to 49-90 percent for 0.5 seconds, then back to 16-28 percent.
Is the duty cycle functioning as described?
HI Range: 49-90%
LO Range: 16-28%
Go to Step 9
Go to Step 6
Test the axle actuator control circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 11
Go to Step 10
Locate and repair an open or short to ground in the ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Locate and repair an open in the ground circuit. Refer to Testing for Continuityand Wiring Repairs in Wiring Systems.
Replace the differential clutch pump actuator check valve. Refer to Differential Clutch Pump Check Valve Replacement.
Did you complete the replacement?
Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Does the fault set?
Go to All-Wheel Drive (AWD) System Functional Inspectionin Rear Drive Axle