Quote Originally Posted by 06T200 View Post
Just FYI, you can find new OE GM ECM's at Rockauto for less than $350 shipped to you for the 2004MY. A local GM dealer charged me $109 (one hour book labor) to program and install it, so $700 is a stretch IMO. But used is definitely an option. Let us know how you fare with the swap.
I called two dealers both say reprogramming / flashing a used ECU ( same year , same trans, etc) is doubtful ( one said 80% failure rate ) , then I look on ebay and find a reputable seller charging $255. for a used ECU reprogrammed/flashed and guaranteed to work as long as I provide all info ( VID , trans, etc)

Interesting how one seller can reprogram/flash a used ECU and dealers say probably not . Someone is incompetent or not telling the truth .

Today I hopefully find out if all things point to a bad ECU . Then it's decision time .