Hey all, new to the forum, I’ve been experiencing weird electrical issues with my 03 Yukon SLT 4x4 awd model, so I purchased it a year ago had engine codes are knock sensors, and also a dash message for door/ajar, so first thing I thought was bcm, I obviously changed the knock sensors with harness aswell to clear code , code for both knock sensors persisted after, so I changed both out along with the harness 2 more times after that, both times new parts, my dash message was first only service brake booster then the service suspension came along after, I replaced my bcm 2 times both times bringer programmed, issues still occur , now I’m getting codes for my cats that were never throwing codes for, I replaced both cats and the codes came back, I’d also like to mention that I drive with my snap on scanner to see the data sometimes and intermittently my scanner loses connection… I’m losing my dam mind throwing parts after parts at it, im just so lost this is my 10th tahoe/Yukon I’ve owned these years and know them pretty frequently, this is the first bad encounter and I would love some advice I’m lost, also I have changed the pcm aswell and had that reprogramed at the dealership , I’m the pics below I had checked voltage to both sides of pcm, witch they are different, and also checked voltage to bcm, pleaseee helppp
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