Copy of letter to Mr. Thomas D'addario, D'addario automotive group, explaining the serious problems which may have been caused by the mass air flow sensor hose not connected or dislodged during the engine/ECM module replacement. The consumer stated due to the problem, he experienced loss of power and a leaking exhaust and/or catalytic converter. Also, the consumer had to add one quart of oil every 1000 miles and the check engine light illuminated several times.

- Monroe, CT, USA

I purchased my 2010 GMC Terrain in May 2013. After a few weeks of having the truck. I heard a rattling noise. I took it back to where I purchased it and they said I was out of oil. From may - Oct. I have had to have 4 oil changes which my mileage was now 52,000. The service light never came on but could hear a rattling sound. They recently did a consumption test on the truck and they say everything looks fine. Now when I stop at a light or stop sign, my truck shakes as though it is going to turn off. It does this randomly. Of course they could not duplicate it when they test drove it. My light does not always illuminate and my speaker on the driver side will be static when I start up the truck. Needless to say, having the truck for only a few months and seeing this many issues is a huge concern, after reading all the complaints I am truly concerned this is not the truck that is going to last very long, even though I paid good money for it. Very disappointing. I have talked to many people who have had to have the engine replaced. Instead of going through all the repairs that seems like the ideal solution. Its odd when you read the other complaints, it seems even GMC doesn't know how to fix their own issues or don't know what is causing these problems. I read that GMC Terrains have had 131 bulletins wow.

- Campbell, CA, USA

Experienced a complete shut down while driving; 1st accelerating to about 20 mph, restarted vehicle, drove about 4 miles to my home doing approx. 35 miles mph, vehicle shut down again. Have appt with wilkens-Buick, glen burnie, md on 8/28/2013; hope I make it without someone crashing into me because of the shutdown. Just had 20000 routine maintenance work done. V6-2994 3.0L DOHC.

- Baltimore, MD, USA

Noticed a hissing noise. Thought was in cabin air filter, so we replaced (it was dirty). Hissing noise continued. Then hissing noise grew worse, no cold air from A/C. brought to the dealer & the compressor was replaced due to a hole in compressor. 22675 miles, 2 yrs 2 mos in service.

- Mahwah, NJ, USA

The contact owns a 2010 GMC Terrain slt. The contact was driving 25 mph when the timing belt detached. The vehicle was towed to a dealer. The dealer stated that the timing belt chain detached and destroyed the engine. The manufacturer was notified. The vehicle was repaired. The failure mileage was 74,000 and the current mileage was 76,500. The VIN was unknown.

- Danbury, CT, USA

I own a 2010 GMC Terrain 4 cyl. I have had several different service problems with my vehicle since June 2010. Although the service department at my dealership has been cooperative and understanding through all the service jobs performed on the vehicle, it has become disheartening and frustrating that my vehicle continues to give me problems with electrical, engine won't start up, static from radio, not able to play iphone through usb connection at times, random warning lights coming on and off on display console. I have been given several reasons of "could be" or "maybe" but never an actual concrete reason for all the numerous problems. The computer system apparently gives false readings on occasion to service department at the dealership about error codes and messages or no error messages will come up, even though there might be issues with the vehicle. My concern is with all the electronic issues, engine issue of not starting up, computer messages or lack of messages to the vehicle when there is an issue.. if I am driving the vehicle and don't know there is a problem because the computer system within the vehicle does not accurate report correct data about the status of the vehicle, then how do I know when to get the vehicle to get serviced before I am stranded with my children or worse yet, get into a car accident because of the vehicle's computer malfunction. My dealership in my hometown can only do so much with information provided by the manufacturer; so if they don't know what type of fixes to make, then my vehicle is not updated with necessary fixes when appropriate.

- San Antonio, TX, USA

The contact owns a 2010 GMC Terrain. While driving approximately 30 mph the contact heard a clapping noise coming from the engine. The vehicle was taken to the dealer where the air conditioner compressor was replaced. The contact continued to hear the noise. The vehicle was taken to the dealer a second time where there were other repairs made. The contact was not sure of what repairs were made. The noise continued after the vehicle was repaired. The contact stated that the noise was constant when the vehicle was driven. The manufacturer was contacted and stated that the technicians could not diagnose the failure and offered no further assistance. The vehicle was not repaired. The approximate failure mileage was 15,000. Updated 02/11/11 the check engine valve and catalytic converter assembly were replaced. Updated 04/21/11

- Miami, FL, USA