GMC Envoy Four Wheel Drive Light

It Won’t Back Up Very Good In Reverse And It’s In 2hi Most Of The Time. We Rarely Have In 4hi Or Low. It Goes Forward Ok But My Wife...

As Car Get Warmer About 15 Miles Auto Light On, Four Wheel Selector, Then Goes 4wheel Hi And 4 Wheel Light Blinks, And On Turns At Slow...