Three problems related to transmission failure have been reported for the 2005 Chevrolet Avalanche. The most recently reported issues are listed below.
On 12/22/12 @ 5pm- shortly after entering onto the freeway, I started losing power. I didn't get higher than 50 mph before the rpm started increasing & my speed started decreasing. I got off the freeway, at the first exit, approximately 2mins after the beginning of the loss of power. Found a mechanic that was just closing his shop & asked him to give a quick check too see if I could continue my drive home, 32mins away. The mechanic checked under the hood & under the bottom & guesstimated the problem to be the flywheel. The mechanic also recommended no driving til repaired. I got my Avalanche towed home that first night. I towed it to my local auto repair shop on 12/24/12, to get a full diagnostic. I was advised by my local mechanic that my 2005 Avalanche w/ 96319 mis, needs a new transmission. My local mechanic advised it may still be under warranty due to mileage, but I have since found out the warranty is 5yr/100000mi. Gm is aware of premature transmission failure on the Avalanche, but is not fixing it for the consumer. Something needs to be done to protect the consumer!.
2005 chevy Avalanche with less than 60k miles, has a transmission failure. No warnings of any type. Vehicle was maintained according to manufactures specifications (transmission fluid changed at 30k miles). Vehicle is in the shop currently being worked on. 2nd and 4th gear cause the vehicle to "come out of gear" causing a loss of power.
Normal driving. Gm TSB 05-07-30-017b talks about an issue they have on several thousand 2004-2006 vehicles that can allow for transmission fluid contamination, leading to failure of the transmission. My experience is that under towing, the vehicle can create a dangerous condition if the transmission fails due to unforeseen circumstances. This also can lead to repair costs over several thousand dollars, that the manufacturer, or warranty companies, will not cover. General motors knows by the issuance of the technical service bulletin that this condition exists, yet refuses to educate the owners of affected vehicles, and refuses to correct the issue and damages it creates. I have found several other cases where this failure has occurred with no remedy from the manufacturer.