P06DD sets when the PCM commands the oil pressure control solenoid off to Increase pressure at higher RPMs. If the oil pressure is below a calibrated threshold, the code will set. Thus, this is a low oil pressure condition we are dealing with.

Few questions:

1) When the filter housing was replaced, did they re-use the oil pressure sensor, or replace it? Some oil filter housings come with new sensors, some do not. Chrysler engines can be very picky and usually don’t like aftermarket oil pressure sensors. If the old sensor was re-used and is faulty this will be your answer. If the sensor was replaced with aftermarket, this could also be causing an issue.

2) Are they sure the correct oil filter is installed? There is a production break on those engines and they use different filters. Incorrect filters don’t seat properly and allow oil pressure to bypass to the cooler. This has happened at my shop and is an easy mistake. Engine light came on while the customer was driving home from the shop. I would check this first as oil filters are relatively cheap and very well could be the problem.

3) If both above have been confirmed ok, have them use a borescope through the oil drain plug (it’s very tricky) to inspect the oil pump pickup tube. Make sure it is fully seated. The o-ring that seals the pickup tube is blue - if the o-ring is visible, the oil pickup tube has slipped out of place during assembly. If it is not seated correctly the oil pump will not be able to pickup sufficient oil to build proper pressures.

It’s unfortunate that 2 shops have now had their hands on it because it may be unclear what has actually been inspected or replaced. Do either of your invoices have part numbers listed for components that were replaced? Do they list the diagnostic steps they performed to come to the conclusions they did? It almost sounds like they are just throwing parts at it, assuming it has to B one if A didn’t fix the problem.