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So this is a bit of a weird one in my opinion. The car has power, dash lights up, radio comes on, key fob still locks and unlocks car, push start button and nothing. 2010 GC grand touring 3.8 M/T. Error code is saying pcm relay circuit open. Ive replaced the main relay, connected straight to the starter and it was trying to turn over, but mechanic says that even the fuel pump isn't responding.

I'm gonna try the second key Monday, gonna try the 15 second brake bypass as well. Anyone think it's the immobilizer or PCM. And if I have to get a new pcm, I just have to get it reprogrammed correct? Mechanic says he's ruled out the clutch position sensor and no other codes are being thrown. Pls help.
 
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