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We traded our 1997 1500 Suburban for a 2003 GMC Sierra 2500HD, Duramax Crew Cab (Demo w/ 5000 mi) to cover our TT GVWR of 6900lbs. Our Suburban was at the max tow capacity and even over at the TT GVWR. Our first trip was a disaster as the Sierra towed worse then our Suburban. We maxed out at about 50-55 mph on a level straight away and could get no more power out it! On inclines, it was even worse.
We took it to the dealer where they replaced a sensor and reprogrammed a computer (TCCM?). On the next trip, nothing had changed and the performance was a bad as before. Talk about disappointment!
We feel the dealer will hopefully find and correct what ever deficiency there is with the Sierra.
Anyone know anything about this from past experience?
We took it to the dealer where they replaced a sensor and reprogrammed a computer (TCCM?). On the next trip, nothing had changed and the performance was a bad as before. Talk about disappointment!

We feel the dealer will hopefully find and correct what ever deficiency there is with the Sierra.
Anyone know anything about this from past experience?