[TyLeRsLJ]

I thought I had this issue fixed but that's a big negative.

Put 500 miles on it since the last time out in Moab. No issues at all. Jeep has been running great around town.

Loaded the Jeep up last week and went to Wheeler Lake here in Colorado. Ran fine all day but coming back down the trail I lost all gauges and the SKIM key light was on. I turned the Jeep off and checked the CEL. The code was for U0155 (Lost Communication with SKIM). Jeep started back up and drove fine for about 100-200 yards then died and wouldn't restart. We started towing it down the trail for about 15 minutes and then stopped. Jeep restarted and ran fine (CEL still on) until I got to the trailer. Jeep died on trailer and wouldn't restart.

SAME CODES AS LAST TIME. p0032, p0038, p0052, p0058. Weird how this only happens on the trails and AFTER the day is almost over. It's weird but all 3 times it happened between 4pm-6pm.

Once the Jeep sat on the trailer all night it fired right up and runs perfect. I said f*&k this and took it to the dealer to run a PCM diagnostics on it. I can't keep having these issues on the trail.

 

[TyLeRsLJ]

Early JK's have this problem and it usually turns out to be the driver in the pcm. Being that your's is a TJ and the codes went away I would guess that you have a wiring problem. The heater circuits usually get separate feeds from the pcm but If I remember correct they share a ground circuit with a lot of other stuff. I would start with your ground wires, wherever you can find them, fender, firewall, battery. As with older vehicles don't be afraid to run a couple extra grounds. From the frame to the body and engine.

Thank you for the info. I'm going to try and diagnosis the problem this weekend. I did have a loose negative battery clamp but I don't think that fixed it. It's running fine now so I'm curious to see what happens as the weather warms up and I put some miles on it. The problem only happened when the outside air temp was hot (80 degree +) and with a heat soaked engine.

 

[TyLeRsLJ]

TyLeRsLJ,
OP here. Good news is you may not have a PCM issue in IMHO.

My Jeep ran fine with the problem of all O2 sensors showing codes. My issue was the Jeep would not pass the smog test. I was forced to change out the PCM even though the Jeep ran fine. With your Jeep not running properly may indicate you have a real problem and not the PCM.

Hopefully you can get to an experienced mechanic that can hunt down your problem. Good luck and maybe it is as simple as some shorted wires.

The weird thing is that it's not doing it now or once the motor was cooled down. Early mornings in Moab I drove it around 30-45 min without a single issue. It's cleared now and runs and drives great. I had the TSB performed a few years back because the Jeep was never ready for emissions testing so I know that's not the issue.

Did you look up those codes?

P0032 - 02 Sensor 1/1 Heater Circuit High
P0038 - 02 Sensor 1/2 Heater Circuit High
P0052 - 02 Sensor 2/1 Heater Circuit High
P0058 - 02 Sensor 2/2 Heater Circuit High

 

[TyLeRsLJ]

Hate to revive this thread but I experienced the same thing just recently.

Was in Moab last week and Jeep started acting funny. My Jeep started throwing p0032, p0038, p0052, & p0058 codes and the Jeep would not restart. I could clear codes with OBDII Scanner Tool and Jeep would run for about 100 yards then die again.

Was able to get Jeep towed back to the trailhead and on my trailer. Once we brought Jeep back to the house and worked on it for a while, the Jeep ran fine. Grounds checked out fine, battery tested good, alt tested fine, all wires looked fine.

Is this a PCM issue? It's interment which leads me to believe it's not but I could be wrong.