Replaced engine harness, now will not start - 2012 Chrysler Town and Country

P0205 Dodge Injector Circuit Malfunction Cylinder 5 PCM !

Sounds like a vacuum line got knock off somewhere causing a vacuum leak and the high idle.

Who replaced every sensor under the hood ???????

fuel lines hook up backwards problem solved...

Seems like the knock censor

You must have damaged the harness while installing the engine.Trace the harness and see uptill where you get power to.
Check all fuse/ground wire

When was the last time plugs, plug wires cap/s rotor/s and coilc were replaced? I would try that first. Also you have the starting year when mercedes was told by the US to use biodegradable insulation that was "cooked" by engine compartment heat. Try buymbparts.com for engine wiring harness and lower engine wiring harness to replace them.

very common for the harness that plugs onto the glow plugs to have too much resistance it will still work but will set codes

i Is the engine wire harness original? or has it already been replaced?
if its original, this may sound crazy unless you already know that MB has a big problem with the wires under the hood.
But your car may need a new engine wire harness.
They start to crumble leaving the wires bare in places to short together and cause all kinds of crazy things.
Your car is at the perfct age to start experiancing this problem.
Unfortunetly the best way to cure this is to replace the harness.
A harness costs about $900 new, plus labor.
To check the harness, I unwrap the wires in several places on top of the engine by the injectors, and for the ignition coils and a few other places, I then bend the wires around a little, and look for cracking or crumbling. If you see ANY cracks in the insulation, that is not good .
To replace the harness is acually easier than it looks. it takes one to two hours, even less if you done one before.
There is a high percentage of the MB that I have seen, have this harness problem..

Good luck, and I hope this info helps

Check power to the instrument cluster, do you have power to the gages?