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2013 silverado 5.3 gas and cng p069e and P2635

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  • 2013 silverado 5.3 gas and cng p069e and P2635

    hello all, I have this new truck and am trying to figure out some stuff. The truck has some check engine codes. when running on gas no codes, when running on cng I'm getting p069e and P2635. I wondering if this is likely the cng fpcm or a wire that came off the factory fpcm. or something else entirely? Any and all advise welcomed.

  • #2
    I guess after further searching I'm looking for the secondary engine controller?

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