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I am not so sure a wrong or damaged key can produce a P0216 code. The VP44 processor gives an output command to the timing piston actuator and reads/confirms the actual position from an optical disk that measures rotation of the advance mechanism within the pump. The processor has no means to tell whether the key is correct as it is external to the pump. In fact the correct key gives the correct TDC reference via a number which is determined by the re-builder on an expensive test bench machine. The re-builder puts the key number on a metal tag on the pump to make sure the correct key number can be verified at installation. The IP gear remains meshed to the cam gear in the R&R procedure and the key is only used to make up for small machining variances in the shaft key groove and small machining tolerance variation within the pump. The problem is when people get the key mixed up or the key gets squished but the processor software can not detect that and we get poor running performance. The code could be left over from the original pump and that is why we need to erase it to differentiate whether the key or new pump is the likely problem. If the code comes back as P0216, the new pump is faulty and would need to be replaced on warranty and the key would be easily checked at that time anyway.

I am with Ryan. If the lights only dim when first starting up (when cold) it is the grid heaters sucking out so much juice. I would remove the belt and hand turn the alternator and idler pulley and see if you can feel any roughness in them. Idler pulley is a cheap fix.

if the mechanic replaced the VP-44, but put the wrong key in, or didn't get the key in right you can throw a 0216 code.Although i have learned sometimes its best to just do it yourself.ship your truck to me and i'll put it together for you

I just replaced my idler pulley a few months ago because it started squeeking. Do the lights dim when you fist start it and its cold because of the grid heater cycle?

I would like to start by saying thanks to everyone who gave me suggestions. I ended pulling the injectors and found a shop that would pop test them for free, they weren't up to standard so I had them rebuilt and my problem was solved. Moparman I will be in contact to help the cause when I am able very soon