Automatic Transmission Problems of GMC Sierra 2500

The contact owns a 2021 GMC sierra. The contact stated that while driving at approximately 70 mph, the vehicle lost power. A " vehicle will not go above 50 mph " message appeared. The vehicle was taken to a dealer where it was sitting been for over four months after being diagnosed that the solenoid valve and transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 50,000.

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The contact owns a 2017 GMC Sierra 2500. The contact stated that while driving at an undisclosed speed, the check engine light illuminated. The contact stated that the transmission was slipping. The vehicle was taken to the dealer. The vehicle was diagnosed with a failed transmission. The transmission need replaced. The vehicle is currently being repaired by an independent mechanic. The manufacturer was not made aware of the failure. The failure mileage was approximately 46,000. VIN unavailable.

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2018 GMC Sierra 2500. Consumer writes in regard to transmission cooler lines recall.

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I have owned my 2001 GMC Sierra 2500hd truck since it was new. The vehicle currently has approximately 92000 miles on it. With the brake line problem I recently had I figured I should report the other issues that I don?t think I should be having with a vehicle that is less than 10 years old. The oil cooler lines and the transmission cooler lines have all rusted through and have had to be replaced. Along with the lines, the connectors for the lines have all had to be replaced due to catastrophic failure (they rusted so bad that were falling apart). If the vehicle was 20 years old I might expect this problem, but not on one less than 10 years old and the mileage that it has.

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2006 GMC diesel with allison transmission. . . Lines to transmission cooler leaking. It is a fire hazard. . . From what I read on the internet it has been a problem with all the transmission lines installed on this truck.

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Fly wheel and speedometer.

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Flywheel on four locally owned gm trucks were reported being cracked or broken. Old parts are avail. Since then speedometer doesn't work properly and I am told there's no problem.

: the contact stated the vehicle stalled on three occasions. All incidents occurred during acceleration while traveling 25 to 35 mph. There were no warnings prior to the incidents and the vehicle had no problems restarting. The dealer could not duplicate or resolve the problem. Updated 11/16/2006 - there were subsequent problem restarting the vehicle, and as many as 3 to 5 stalling episodes per week. Not all incidents occurred while traveling. Some incidents occurred while at idle, and at a stop. Complete loss of power steering and brakes occurred when the vehicle stalled. The dealer diagnosed the problem as a faulty crankshaft sensor and replaced it. Recently the check engine light has illuminated. The dealer diagnosed the problem as a faulty transmission selector position sensor and replaced it. The abs activated while driving on dry pavement. The dealer found it necessary to replace both front abs wheel speed sensors.

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: the contact stated the vehicle stalled while in gear on four occasions. The vehicle had not been to a service dealer to resolve the issue. The contact expressed concern that this was a defect. The crankshaft position sensor was replaced. Updated 12/15/06.

While driving automatic transmission will down shift abruptly and vehicle may lunge forward when sitting at light. Driver must keep foot pressed hard against brake pedal to keep from moving when sitting still. Please describe details.