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Message: <blockquote data-quote="clevor" data-source="post: 25109" data-attributes="member: 6998"><p>I have cleared these codes several times and they come back. doesn't matter if the engine is on or engine off with key on. I have tried two different scan tools for code clearing and again it doesn't make any difference. As far as the codes go, I went out this morning, to check the codes again to list them. With key on I had 4 codes, I cleared those codes and came back with 40 codes. Started it up, cleared those codes and it came back with 41 codes. Compared those codes with what I wrote down and some of those has disappeared and new ones have come up. You see why I have reached out to this site for help. Seems TCM has a mental illness. I can list those codes if you want but I don't think that will help. I have been involved with GM products since 1981 in a shop setting and was their go to guy for anything computer related. I have seen as many as 3 to 5 codes stored in an engine management computer but never this many in any ecu. I want to be certain that it is the tcm before I go and plop down 500 to 700 for one.</p></blockquote><p></p>