I suspect I may be having the same problem
@CharlieP . I just purchased my 2019 Laramie 4x4 as a CPOV (at 48000 miles) and still within the first 3 month 3000 mile Maxcare warranty. I started having trouble getting into 4Lo, 4Hi, and 4Auto. Lights would just flash and never get into the modes. Took it into the dealer today, they just told me they did a whole bunch of test and will need to replace the front axle actuator and maybe more. My service advisor is pretty awesome, he actually sent me the detail notes from the technician:
inspected vehicle for service 4wd warning and not being able to shift into 4HI or 4LO. verified customer concern, found vehicle will not shift into 4WD, performed wi-tech vehicle scan and found 2 DTC present pertaining to customer concern, U1440(implausible transfer case ratio high received) U0403-00(implausible data received from T-Case) found service bulleting 08-083-20 pertaining to customer concern and DTC's set. inspected DTCM software level and found software is out of date. performed software update to DTCM. DTCM old#68277414AN new#68277414AP. after software update, performed second road test while shifting into 4WD, found vehicle 4WD light is blinking and will not shift and message comes up with service 4WD. performed wi-tech vehicle scan a second time, found 1 new DTC present, C147B-92(front axle disconnect sensor performance or incorrect operation), perform diagnosis for new DTC. performed resistance test on circuit G303 for open resistance, measured 0.8ohms, performed continuity test between circuit G303 and ground, found no continuity present. tested for continuity between circuit G303 and other circuits at ECU connector, found no continuity present, removed front axle disconnect actuator and inpsected front axle shaft and collar on axle no damage to axles are present, and collar moves freely and engages and disengages front axle manually. recommend replacing front axle disconnect actuator and re-check
Hopefully, this will all get covered under the Maxcare, otherwise, i am going to be pretty pissed off since i just bought this a month ago. Any advise on what I should say to maximize my chance of getting this covered under MaxCare or what i should ask them to check to make sure they replace all that needs to be replaced like perhaps the transfer case?