2H for me. I've never selected 4A.
The CAN bus system has been around since the 80's and has come a long way in solving each module having to be individually wired into the system back to the main processing unit . Today's systems are generally very fault tolerate and it's like you say special equipment is needed, as well as someone that knows how to use it. The CAN bus many times has it's own "ground" which is not chassis ground as a point of reference for the systems variables on multiple CAN bus lines. The variables of each system is programmed in and maybe just maybe it could be simple variables being "to sensitive" in what is set. Before specialized equipment an oscilloscope was your friend in seeing vaults and many CAN system tools has it's roots in the oscilloscope. If the problem exist in the ground system, faults if even getting stored can and will mislead as that is the plane of reference, not the data carrier signal for a code and they are still traveling along. In some of my scenarios dealers and shops gave up and it was just flat time and back to old school basics of individual wire references and a very sensitive scope, meters and full vehicle wiring diagrams. One I will never forget is a 2018 F150 steering rack problem. Three replacement units later I got the truck through word of mouth and two days later found the problem and it was the ground for the cable to the CAN system wiring. Codes were not present for anything to do with steering unit, even though it appeared (Physically)as it was failing each time (no check light on ) codes were stored for temporary hill decent, traction control and get this, brake booster sensor. It's the old school way that sometimes saves your backside (been there many times over computer controls)but few are still around that understand it much less the new electronic world they've created and how all things old and new work together for vehicles. I even spent days looking for odd codes in a truck being randomly thrown and it had nothing to do with any of the electronic system. Old school vacuum monitoring lead me to a strange vacuum scenario and it was a one way vacuum valve intermittently leaking and throwing the whole electronic monitoring system off! Bad chassis (may of them today)grounds can create stray EMF signals and with today's smaller wiring if not shielded properly or in to close of proximity can disrupt the system of CAN bus.
I was parked and then put my truck into drive. Merged out into street, then got up to about 20mph and my truck shifted on its own into Baja mode and 4H. I looked down and then hit my R button to go into my preferred settings and it didn’t work then moved the dial back normal mode and it went into 2H. I stopped, turned off the truck, opened door twice, then started truck and was in normal mode and my R button worked. So far it’s happened twice and no error codes in Ford App. Dealer also didn’t find any error codes when scanning it. Told me it’s a computer programming glitch and won’t get fixed until Ford does an update.
You are the first non-Raptor owner to report in this thread, unless @kyarnelli in post #36 does not have a RR, (his sig doesn't say). As far as I can tell the common thread was Raptors till today.
Post 3 was a Lariat.
