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Re: Code P1391, P0320, Interference on 5 volt reference
Posted to Technical Discussion Forum on 2/13/2020

If you are using a lab scope, the wires leads may have been close enough to an ignition wire to induce the voltage signal. Many times I see noise on the signal from ignition events on different circuits.

If you have a capacitance cascade box you can add capa... Login to read more.