Transmission Fluid Leaking problems of the 2007 Chevrolet Trailblazer

Both transmission cooler lines were heavily corroded and caused a leak. There is a TSB for certain model years and alot of complaints online. TSB #pit-4722 -- GMC: fluid leak from transmission oil cooler lines due to corrosion. All 2000-2006 light duty trucks equipped with the light duty automatic transmission. (NHTSA id #10026804, October 01 2008) .

I was driving my 2007 Trailblazer home after a 150 mile trip to columbus and noticed oil spots on my driveway. I moved and parked the vehicle in another location where a large puddle of "oil. " fell under the engine. I climbed underneath and saw transmission fluid dripping from the frame onto the ground. I called graham Chevrolet and was told not to drive as it would cause severe damage to the transmission resulting in a costly repair or replacement. I called aaa and had the vehicle towed on a flatbed truck to graham Chevrolet where they replaced the corroded and leaking transmission lines with a bill of over $500. 00 for the work done. They said gm knows of the problem and it is common to theses vehicles, but no recall or warranty repair was authorized. It was the customers problem to take care of. I have since found others with the same issue and also did an internet search showing many Trailblazers with this problem. My complaint is that the vehicle was designed and built with a defective transmission cooler line material subject to corrosion and failure over time. Gm and Chevrolet should be responsible for this repair and issue a callback to prevent any potential accidents or injuries due to this failure.

Fluid leak from transmission oil cooler lines due to corrosion.