The accumulator filling pressure remains constant error is related to your compressor. Over time the seal on the piston gets worn out.

Search eBay for "wabco rebuild kit" on eBay its a 50 dollar preventative fix.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards