Hemi swap 6.1L Turnover, Pause Start Issue

I agree, on his modified install he probably didn't install some of those components. So here's an example of a high circuit code issue. Let's use the P0449. There are 2 wires(circuits) coming from the PCM to the Vent valve. 1 of those wires has either(5 or 12 volts) don't know without a schematic. And the other wire is the ground that actually does the switching on/off as it's applied by the PCM. That vent valve has voltage on it all the time when the engine is on, and the PCM expects to see that 5v or 12v voltage go low or drop when the vent valve is turned on once the ground is supplied, but the voltage never changes and stays high, because the vent valve probably is missing, thus "high voltage circuit code".