Automatic Transmission Torque Converter Problems of GMC Envoy

I have a 2003 GMC Envoy, 80,700 miles original owner. While merging onto highway transmission locked in 2nd gear. Engine rpm's increased to 5,000 speed dropped to 20 mph creating a dangerous situation with oncoming traffic. This happened without warning or any indication of a problem. I had vehicle towed to GMC dealer, asked if there were any known problems with GMC Envoy transmissions and was told there were none. The diagnosis, my transmission exploded internally with a failure of the sun shell gear and torque converter. Transmission could not be rebuilt and the cost of installing a re manufactured transmission was $3700! gm has been having these transmission failures since 2002 with no acknowledgment of liability!.

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- the contact owns a 2006 GMC Envoy denali. There was a vibration in the vehicle when the gas pedal was applied while traveling between 30 and 40 mph. The vehicle would also vibrate at any speed. It felt and sounded as if it needed to shift gears, as in a manual vehicle, but was in the wrong gear. It was involved in a crash in November 2006. Two dealers stated that there was a technical service bulletin that referenced the failure, but there was nothing they could do to correct it. When engaging the brake the vehicle would move forward and a noise could be heard. The noise frequently occurred after a quick stop. This failure had occurred during the same period of time. The dealer diagnosed the failure, and stated they have repaired the noise, but it continued to occur. The current mileage was 14,000, and the failure mileage was 13,118.

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The contact owns a 2005 GMC Envoy. The contact stated that the engine made a loud knocking noise when driving. While driving uphill, the vehicle dramatically decelerates as if the engine was stalling. The engine and oil lights illuminated on the instrument control panel. She took the vehicle to the dealer for an oil change, but the oil light remained illuminated. She took the vehicle to a local dealer four times and they reprogrammed the p. C. Another dealer stated that the engine drags when traveling uphill, which was probably due to the clutch fans. The contact also stated that the air conditioning system does not work. After all four repairs were performed, her vehicle continues to experience the same failures. She contacted the manufacturer and they stated that they would not provide any financial assistance because the extended warranty expired. The speed was unknown. The failure mileage was 3,809 and current mileage was 82,000.

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