p0642 intermittent

Question

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

Answer 1

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.