jeep2020-odb2-jscan-deep-diags-2026-07-10

long story short: i want to look for evidence the alternator was not the source of the recent issues. see this chat for deets.

need 2 items to go deeper than a simple “check codes” with my cheeepy odb2 bt adapter ¹(which i cannot fucking find!! it was in the car, no longer in port when recently did this work;). is blue);

1. an sgw bypass cable
   
   ; inserts in the 12-pin connector allows you dongle to talk to the can bus at a deeper level. ²but why can’t yu just plug your odb2 dongle direct to the 12-pin cable? does the system need to have the odb2 plug attached?
2. software that understands the jeep/chrysler/? specific codes; jscan is free if no liscence purchased; ³requires license for the full ability to set stuff, but i will try it without liscsance for what i wan. i think
3. an odb2 dongle that is known to be compatible this one
   
   (specifically sez jeep KL version?/model? is supported;) with the fuckery jeep does to the signals or code or both?
   

• 1
  (which i cannot fucking find!! it was in the car, no longer in port when recently did this work;). is blue);
• 2
  but why can’t yu just plug your odb2 dongle direct to the 12-pin cable? does the system need to have the odb2 plug attached?
• 3
  requires license for the full ability to set stuff, but i will try it without liscsance for what i wan. i think