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There was a JKU YouTuber that post information about a technical bulletin that stated if P0579 and P0591 are both present, it is most likely a grounding issue with the SC switch since the ground is shared. See attached screen shot. if my problem is intermittent again and if it is a grounding...

I went ahead and changed out the cruise control switch. It was 89.14 total mopar part from dealership. The cruise control comes on now but is still intermittent. At first it did not work, until I cleared the codes. The two codes P0579 and P0591 show up as stored codes now, not as active as prior...

Im having same issue with same codes, less evap issue. What was your fix?