It's in the wiring or the tcm. Your wiring harness may be rubbing somewhere. If not then it's prob the tcm. I could be wrong but I dont think there is anything else it can be since they put a new ECM in there. It's not going to be easy to find if it's a wiring problem but there no reason to worry over it just let them fix it. Go in there and tell them what I've told you and say you need loaner car and you want it fixed for sure this time. Tell them to check the wiring harness over very good.
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