This pretty much means that your computer has failed. The engine will go into limp mode at this point, as you have noticed. You need to have the computer tested, but really the only way to do this is at a dealership. Most mechanics won't have the right tools. A dealership might be able to reset your computer and get you going again. You should be prepared, tough, to hear that your computer is shot and can not be fixed. In that case, you're looking at $600-$800 for the part it's self.
However, you can try to monkey around yourself. Disconnect the wiring harness from the PCM and make sure both connectors are clean. Reconnect the wiring harness. Go around the engine and make sure all ground connections are clean and tight. A bad ground in the wrong spot and really mess with the computer too. I wish I could be more specific, but it's really a matter of just hunting around the engine and making sure everything is tight and clean.
Testimonial: "Thanks for the advice. Will try your suggestions."
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