I don’t know if your PCM is bad, I’m just saying that from what I Googled, if you’re seeing a “no buss” message, that it supposedly means your dash, or in other words your instrument panel cluster has lost communication with your truck’s computer. That could be either in bad wiring somewhere, or a bad connection somewhere either from your pcm or from your cluster, or you could have a bad computer. Also I read that the connection harnesses at the computer itself were supposedly prone to corrosion inside the connectors.
I would start at the computer and check connections. Make sure you unhook both battery cables first, and cycle your ignition on and off, and turn your headlight switch on and off after you unhook the battery to make sure you depleted all residual power before you go messin with those computer connectors because if you didn’t have a bad pcm before, you might then. And once you let the magic smoke out, it’s toast.
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