Error codes U0001 and U0401 on a 2020 Gladiator Overland

[Sandevino]

No kidding. Windows NT, OS2......... our engineers couldn't wait to get their hands on Pentium systems.
I worked with a guy who was taking a break from being professor of computer science at an Iowa college. He told me of his days when HP contacted him to come up with drivers for their latest printer line - oh, we need it next week. He said he stacked Mountain Dew and Snickers bars in his "closet" and stayed all weekend until it was done.
I talked at length one time with a head engineer from YMS - Young Microsystems, then a maker of a very good, reliable and compact 486 board. He talked about the pressures of designing the next system board and how their health coverage was good - and the part used most often was mental health portion when the engineers suffered breakdowns from the stress.

I was also dealing with converting a major international corporate away from thin net/Ethernet to 10BaseT with the head of IT insisting there was nothing wrong with coax Ethernet and no, 10 different coax LANs running to multiple boards in a single server was fine. Each network card supported from 2 to 4 networks. He killed that Netware server because it was so busy routing traffic it couldn't deal with login attempts.

Stressful work - keep up or get left in the dust. I really liked that head of IT - he was my boss and we were basically friends. It was a sad day when I realized I was the reason he was let go.

Oh the stories we can tell but no one wants to hear. Everyone today has no idea what we had to "develop" and come up with and they all take it for granted today. Object oriented is childs play....but I digress....lol

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[Papa Bear]

Take a look at your fuses and added electric components. I've seen additional electronics add excessive resistance (or capacitance) bringing circuits outside of spec.

I'm the a-hole that added resisters to circuits in conspicuous locations when teaching techs how to troubleshoot. I doubt the shop is testing circuitry but they are on the right path wanting to remove all extraneous non-factory electrical components.

Very sorry to poach on this forum guys but this information looks really promising at helping me diagnose the codes I have been getting. I am going to drop the glove box and begin checking connections and adding dielectric grease to each connection. However, in addition to this, someone advised I look at the AUX battery and that it could manifest many of the same problems. I hope that exploring these two options will sort it out but was hoping someone here may offer some advice that I haven't looked at.


I have a 2020 JTR 3.6. The mods I have are an AEV 2.0 spacer lift, BFG KO2 37x12.5 R17 (factory wheels), AEV steering damper and AEV Geometry Correction Brackets. Until a few days ago I was using the Tazer JL Mini to configure everything.
I sent Tazer back for a replacement because I was getting multiple codes while driving that I believed were related to the Tazer failing even though I had 10 months without issues and upgraded the software as new versions came out. I removed the Tazer this past Thursday, unmarried it, disconnected the negative battery for 15 minutes then reconnected negative terminal and followed all of the instructions ZAutomotive told me to.
Today while driving it sans Tazer, I got all of the same error codes plus a new shiny one called “Service Shifter.”
This has been a constant situation for the past two months but progressively gotten to be more frequent and apart from being a major cause for concern it’s also been hard to pinpoint and a major pain in my a$$!
While driving I would get the ABS, Traction Control, Blindspot unavailable, Brake light and loss of power steering. When I pulled over and put the Jeep in Park, I couldn’t get it out of Park. Without the Tazer I also don’t know how to clear the DTCs. I shut the engine off for a couple minutes and was able to shift into Drive but the “Christmas tree” of lights remained…eventually after slowly creeping along the back road home all the lights went off except for the traction control light and the check engine light. The “Service Shifter” warning was most troubling as was the loss of power steering.
I’m getting the following codes and could really use some help from anyone with knowledge on what this issue could be caused by.

[/QUOTE]

 

[Phantom]

Very sorry to poach on this forum guys but this information looks really promising at helping me diagnose the codes I have been getting. I am going to drop the glove box and begin checking connections and adding dielectric grease to each connection. However, in addition to this, someone advised I look at the AUX battery and that it could manifest many of the same problems. I hope that exploring these two options will sort it out but was hoping someone here may offer some advice that I haven't looked at.


I have a 2020 JTR 3.6. The mods I have are an AEV 2.0 spacer lift, BFG KO2 37x12.5 R17 (factory wheels), AEV steering damper and AEV Geometry Correction Brackets. Until a few days ago I was using the Tazer JL Mini to configure everything.
I sent Tazer back for a replacement because I was getting multiple codes while driving that I believed were related to the Tazer failing even though I had 10 months without issues and upgraded the software as new versions came out. I removed the Tazer this past Thursday, unmarried it, disconnected the negative battery for 15 minutes then reconnected negative terminal and followed all of the instructions ZAutomotive told me to.
Today while driving it sans Tazer, I got all of the same error codes plus a new shiny one called “Service Shifter.”
This has been a constant situation for the past two months but progressively gotten to be more frequent and apart from being a major cause for concern it’s also been hard to pinpoint and a major pain in my a$$!
While driving I would get the ABS, Traction Control, Blindspot unavailable, Brake light and loss of power steering. When I pulled over and put the Jeep in Park, I couldn’t get it out of Park. Without the Tazer I also don’t know how to clear the DTCs. I shut the engine off for a couple minutes and was able to shift into Drive but the “Christmas tree” of lights remained…eventually after slowly creeping along the back road home all the lights went off except for the traction control light and the check engine light. The “Service Shifter” warning was most troubling as was the loss of power steering.
I’m getting the following codes and could really use some help from anyone with knowledge on what this issue could be caused by.

[/QUOTE]
Any update to what this ended up being?

 

[ShadowsPapa]

However, in addition to this, someone advised I look at the AUX battery and that it could manifest many of the same problems.

Won't be that.
It causes earthquakes, floods and hurricanes, but the batteries are connected in parallel so it can't act by itself to cause problems.

The CANbus connectors are generally where you have a mish-mash of communications, module and other similar errors.

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