Having problems with your 2005 GMC Sierra 2500HD 4WD ?
Wont shift from 2WD to 4WD. 4WD indicator switch blinks (light) but 2WD switch light never goes out.
Check switch , fuse and relay if good check cable hoses and wiring at transfer are not damaged or disconnected -check actuator for proper movement actuator has a tendency to stick lube actuator rod if necessary
Repair Help & Product Troubleshooting for 2005 GMC Sierra 2500HD 4WD
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