truck will not run except with radio unplugged does this with old and new radio
What is your question?
checked everything with a scan tool would not connect with ecm replaced ecm same problem. radio also wold not play. Unpluged radio truck starts runs fine. replaced radio same problem.
What makes this problem better or worse?
if radio is pluged in
How long has your 2006 GMC Sierra 1500 had this problem?
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Is this a factory equipped radio? How would you even guess to look at the radio with a no start issue? What is the rest of the story that we might be missing?