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Thanks Hino123 for your time I never seen your reply... Misunderstanding. The ground’s were not a live circuit. The harnesses were disconnected with the engine off and key both off/on. The various sensor grounds are very erratic and way out of acceptable range. No doubt some electrical...

Update with question: In review, months ago we had repetitive limp-mode issues. Various inactive codes, unable to scan while light was on. Greasy recommended checking all grounds before getting into replacing parts/turbo. I had found that all sensor grounds showed major resistance with lights...

Been waiting to give a solid update, so here's the current report: Ground issues and beyond (I should've known!). Thanks to MR! greasytshirt for promptly correcting our steps to diagnose/resolve this. That is not saying that I still follow or understand proper diagnoses steps so bare with me...

2005 UD 2300 JO8E, 335K miles I owned for 100K miles without a local shop to scan or hardly want to touch it (hindsight) 1st current issue is Limp mode w/no symptoms: Average 5 times a week for last 8 weeks or so...the engine light comes on with de-rate/limp mode occurring. Most common times...