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p0642 code appears intermittently won't rev over 2000 rpm, replaced TPS. x2, have truck undercoated yearly bad ground ????

Vehicle: 2005 Silverado 2500 HD Duramax

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P0642 5 volts refference 1 circuit voltage low

Bad ground would give you circuit high,which would be a disconnection, you have more of a bad sensor that is affecting your TPS, depending on the engine this could be your EOP (engine oil pressure) your fuel rail pressure sensor, and other sensor along circuit 1 that causing it to go low.

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