I have an 08 Hummer H2 and had the maggie put on about a year ago. Now my transmission control module is messed up and dealership says that they need the ecm to go back to stock for them to figure out if the maggie was problem that caused the electrical problem in the first place. They dont want to cover under warranty. Any suggestions. Thank you

 

I would talk to one of the tuners who are sponsors on the site, Wheatley, Nelson or Blackbear should be able to answer your question and probably return your truck to stock if needed. Links to their sites are on the right ===>