3.0 Journey

[hebbjr2413]

Good morning,

I'm new to the site and looking for a bit of advice. After lurking for about a year, I finally bought my Wrangler JL 2022 last July with 32,000 miles on it. Currently, it has 33,000 miles. During the first week, I drove it approximately 200 miles, and while traveling down the highway at around 80-81 miles an hour, the check engine light came on, followed by the traction control warning, ABS warning, and then "Exhaust system needs to be Serviced." I took it back to the dealer I bought it from, who was very accommodating and loaned me a car while it was in the shop. The outcome was that everything checked out and they performed a manual regen.

I initially thought this might be a one-time issue, perhaps because it had sat for a while or the previous owner let it idle too much. However, it has now happened five times, with the Jeep visiting multiple dealers in an attempt to diagnose the issue. I've gone into limp mode on the highway multiple times. On one occasion, while in regen, I stopped on an off-ramp, and the start/stop system decided to kill the engine at the light, sending me into limp mode.

To monitor the situation, I bought a Banks gauge to keep an eye on temps and soot levels. Unfortunately, last month, while on a trail in Colorado with a 30% load, it went into limp mode again. I took it to the last dealership, where we had a bit of an argument about whether it had a tune or not (it does not). Their conclusion was to replace the DPF and a sensor.

I picked up the Jeep last weekend and took it for a drive to the lake, thinking everything was working fine. However, on Monday, I drove it to the airport with 43% soot level. When I returned on Friday and left the parking lot, I noticed the gauge had jumped from 43% to 83% in just 6 miles. A regen started, and I didn't shut the Jeep off. After grabbing a drink and hitting the highway, the regen completed, and the soot level dropped to 9%. However, after another 6 miles, it climbed to 30%, and after another 12 miles, it was at 60%. By the time I finished my 45-mile trip, it was at 70%, and I was in limp mode with the "service exhaust system" warning. So, in less than 200 miles, the Jeep was not running properly again.

I took photos of the codes and videos of how quickly the soot was building up. The last dealer stated that the injectors and turbo tested fine. Could this issue be related to a clogged EGR? It seems like really low miles for something like that to be the problem.

Any ideas on what I might be up against would be greatly appreciated.

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[hebbjr2413]

 

[DwnSth]

Change the oil with correct speed oil. I know others will disagree with me but I experienced almost all of this due to dealer using Rotella rather than the Euro Synthetic.

 

[grimmjeeper]

Change the oil with correct speed oil. I know others will disagree with me but I experienced almost all of this due to dealer using Rotella rather than the Euro Synthetic.

The type of oil would have nothing to do with the problems he's seeing.

 

[Downtrail]

One thing to check is whether you have a leak on one of the turbo charge cooler hoses. It’s a common problem on the forums. Some folks think their cold side hose (going back to the engine intake) was damaged when the high pressure fuel pump recall was done, which seems possible given how tight things are in that area. My cold side hose had a leak in a hard to see spot, that I think might have been a hose failure after about 75k miles. I couldn’t actually find the leak until I took the hose off. I think a leak like that causes the engine to run rich, filling up the DPF quickly, and I noticed mine stumbling a bit after I started it while it was still cold. I would drive 50 miles and need an active regen. Another symptom was passive regen appeared ineffective, with SL going up even at freeway speed while passive regen was occurring. After I replaced the hose, passive regen would slowly reduce SL at highway speed like it should. And active regens went back to being rare, every 500-1000 miles, depending on the type of driving.

 

[DwnSth]

The type of oil would have nothing to do with the problems he's seeing.

I can only speak from my actual experience. Rotella causd codes and constant regens until I changed with correct oil. Nothing else was changed or adjusted. All went back to normal after a bit over 100 miles with new oil.

 

[BDinTX]

With the variety of unrelated systems causing problems I’d suspect electrical. There is a bundle of wires going down the firewall on the passenger side that is supposed to be under a heat shield. Some of the earlier ones had it on top of the heat shield and lying against the exhaust.

I’d also make sure the battery / batteries are in good shape.

it’s also possible you have more than one thing going on. The oil and turbo hoses seem like reasonable things to check.

Sorry to hear your new to you diesel is being problematic.

 

[azjl#3]

I can only speak from my actual experience. Rotella causd codes and constant regens until I changed with correct oil. Nothing else was changed or adjusted. All went back to normal after a bit over 100 miles with new oil.

correlation is not causation.

 

[hebbjr2413]

One thing to check is whether you have a leak on one of the turbo charge cooler hoses. It’s a common problem on the forums. Some folks think their cold side hose (going back to the engine intake) was damaged when the high pressure fuel pump recall was done, which seems possible given how tight things are in that area. My cold side hose had a leak in a hard to see spot, that I think might have been a hose failure after about 75k miles. I couldn’t actually find the leak until I took the hose off. I think a leak like that causes the engine to run rich, filling up the DPF quickly, and I noticed mine stumbling a bit after I started it while it was still cold. I would drive 50 miles and need an active regen. Another symptom was passive regen appeared ineffective, with SL going up even at freeway speed while passive regen was occurring. After I replaced the hose, passive regen would slowly reduce SL at highway speed like it should. And active regens went back to being rare, every 500-1000 miles, depending on the type of driving.

That is a good idea, that I did not think about. Going to drop it off in the morning and have them check this.

 

[hebbjr2413]

With the variety of unrelated systems causing problems I’d suspect electrical. There is a bundle of wires going down the firewall on the passenger side that is supposed to be under a heat shield. Some of the earlier ones had it on top of the heat shield and lying against the exhaust.

I’d also make sure the battery / batteries are in good shape.

it’s also possible you have more than one thing going on. The oil and turbo hoses seem like reasonable things to check.

Sorry to hear your new to you diesel is being problematic.

I thought the same thing, due to the amount of codes that its throwing, some are related and others are not. Especially with not codes point to the Exhaust or the dosing system. The dash has never displayed anything about needing to regen or the system being full. there is never communication about the Def system. how ever I have read the manual and noticed it should show messages.

 

[DwnSth]

correlation is not causation.

Rotella has high ash content:
Here's why:

• Ash Content:
  Engine oil contains additives like phosphorus, zinc, and sulfur, which contribute to ash formation when burned. These ash particles accumulate in the DPF, and if the oil has high ash content, it can lead to premature clogging and reduced regeneration efficiency.
  

 

[BDinTX]

Rotella has high ash content:
Here's why:

• Ash Content:
  Engine oil contains additives like phosphorus, zinc, and sulfur, which contribute to ash formation when burned. These ash particles accumulate in the DPF, and if the oil has high ash content, it can lead to premature clogging and reduced regeneration efficiency.

Frequent regens sure, but are you saying the wrong oil caused codes for ABS and traction control?

 

[DwnSth]

Frequent regens sure, but are you saying the wrong oil caused codes for ABS and traction control?

No, I'm sure they are separate issues, although I was getting random codes that didnt seem related. One thing on the codes, always check that the main fuses are seated fully. This is not a new Jeep so don't think that's the issue but even slightly unseated fuses on JL's can do some very odd things.

 

[rickinAZ]

If you spend much time on this forum, you'll see just how much trouble the aux battery can cause. It only takes about five minutes to bypass it, and honestly, there's little reason to keep it installed. As Brad hinted, the strange behaviors triggered by that battery often defy logic. Early in my ownership, my aux battery went haywire—you'd think my Jeep was haunted: wipers turning on, lights flashing, random error codes popping up...

It’s a great engine overall, but owning one can definitely become a bit of a “hobby.”

Please keep us posted—that’s how we all learn from each other.

P.S. Your erratic soot levels sound sensor-related. You mentioned replacing one—can you clarify which one?

 

[hebbjr2413]

I believe the erratic codes are from the derate, each time this has happened I loose throttle control (only can input half throttle) and all lights come on the dash. I could be wrong, this is just my thoughts.

the sensor replaced was is the Exhaust Pressure Differential sensor. Part number 68302134AA

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