There are numerous things that can cause this problems, one is the TCCM, the other is the encoder motor, and or course any wiring/connectors, etc., between these components and the switches and BCM.
There is a bulletin to reprogram the TCCM, but it appears this reprogram is only for a condition where certain codes are noted, but some dealers may just reprogram blindly, rather than troubleshooting the actual problem.
Yes these parts are definitely covered under warranty.
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Black Sheep Hummer Squadron
(ME TOO)
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