I had the squeaking on the c pillar that sounds like someone is making a balloon animal. Took it to the SC and they tried lining with felt tape the first time but it didn’t work. 2nd time finally fixed by moving the strike plate. No charge. This was maybe 4 months after car was purchased.
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First, the door can't be raised with the striker. The FWD striker is in the body below the door sill. It only adjusts left/right and in/out.
The latch on the door can be adjusted left/right and up/down. To move the door up with latch/striker adjustment, you must adjust the latch, not the striker.
This adjustment they said they did is far from complete. Assuming the vertical alignment with the front door and a pillar was good on the left and the vertical alignment with the rear quarter panel and liftgate on the right (assuming drivers side), then when they lifted the door slightly, they messed up this alignment. Now if the FWD was already too low compared to the a-pillar/front door and lift/quarter panel, then maybe they improved it. If it was already good before, then it isn't now.
At the very least, if they moved the door up, then they also needed to adjust the roof mounted bump stops otherwise the weight of the door is not resting on the roof frame and is instead weight on the latch only.
Please see Technical Service Document TN-16-11-002.
Can you post a picture of the door the said they adjusted that includes a little bit of the surrounding panels (i.e. a-pillar next to FWD, front door at the rear of it, and some of the rear quarter panel (including liftgate edge at the roof)?