Our 2008 Denali is experiencing what I believe to be torque converter trouble. Most of the time I notice it when cruising in the 35-40mph range at low rpm (1300 or so rpm) – when you encounter a slight incline it will shudder so bad that it feels like you are driving over rumble strips. As...
Recently bought a used 2003 Tahoe - 4x4 worked intermittantly. Bought on the cheap. Seller had quote from dealer to fix 4x4 for around 1100(reflash tccm and replace encoder). Service 4wd message was always on the dash. Dealer said code was C03-27 i believe. Truck was always stuck in 2wd...
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