Question about 2002 GMC Envoy
Have no 4hi or a4hi only 2 weel drive where is the 4weel module and where to buy or how to test
Had the same concern. Had to take mine to the dealership and have them replace the system. Be careful when you change between the drives. Vehicle MUST be in park, of course started, and you can change the drive. WAIT until the light completely stops blinking before placing into gear or trying to change to another setting. When you change the setting, a gear arm raises or lowers, and resets. Listen and you can hear it. Often when the vehicle has sat for a while, or if the battery has been disconnected, you will hear it resetting. If this does not work, you have to take it into the shop to have the gear sensor repalced.
Posted on Dec 01, 2008
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