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Did you get Your ECM problem fixed?
There's a company in Canada that repairs electronics XeModex
There's a US group and Canadian group.
They have been great to deal with. There's a large group of us Duramax owners that have had bad TCMs that have been sending our modules to them.
Lifetime warranty I dont know if thats for all repair. Mine couldn't be repaired, but I was reimbursed.