See here: https://www.jeepcherokeeclub.com/threads/fueling-problem.244663/

As for the other issues, it may be telling you it's time to cut your losses.

 

Yes a for sale sign will fix it.....

 

Hey @bakejurns ,


1. Gas pumping issue I'm thinking the ESIM is not venting properly so back pressure is building up . Could be a line also but if you can get a used canister from a wrecked Cherokee, I'd try that alkso because it's a fairly easy replacement (It's located behind the passenger rear wheel well trim and all functions, including ESIM are integrated into it). See also the attached .pdf.

2. Electric Parking Brake (EPB) issue. There's a TSB wherein water can come into the cargo area and short out the electric parking brake control module which is located there. In the rear cargo area open the lift gate and on the left side floor is a "cup". Pull up on it to pull it out and feel the felt underneath. Is it wet? Also check in/around your spare tire. Wetness? There's a known TSB (technical service bulleting ) about this issue. Not sure, they may be doing free fix on this if diagnosed as the module getting wet? (FORUM MEMBERS, anyone know if this is a free recall work?)

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3. Good chance it's the PTU but per your EPB issue above (#2), the module that controls the 4WD, called a Drive Train Control Module or DTCM is ALSO located in the trunk area near the spare tire. I would highly suggest checking for water/moisture back there since you've got two modules in the same are exhibiting problems. It could just be that the module is intermittent due to a moisture issue.​

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Question, which AD unit do you have, AD1 or 2? Have you tried disabling the PTU to see if the issue temporarily goes away? (Fuse F10) Below BTW are all the fuses involved in the 4WD operation if you want to pull some separately (e.g. RDM to diagnose if the issue is coming from the rear unit). If you find moisture, pull them all (esp. F47 the DTCM). Note, the SCV 4WD light will come on and stay on when you pull the fuses. Don't worry, this is normal and just alerting you the 4WD system is not operational. It will go back to the way it was when the fuses are put back in.​

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"Driver Input" mode: meaning the driver turns the SelecTerrain knob and chooses what they want. ​

Fuse F76 (RDM)​

Fuse F47 (DTCM)​

Fuse F10 (PTU)​

Fuse F69 (SelecTerrain knob)​

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Automated Transition Event (ATE) mode (safety mode): meaning the computer decides based on the road or environmental conditions to engage AWD. These include environmental and dynamic events such as lower temperatures, rain detection and changes in slope. When this fuse (F14) is pulled, the Traction Control System (TCS) shows disengaged (inoperable)​

Fuse F14 (DTCM/PTU/RDM & Brake System Module (BSM))​

4. Flashing odometer means one of your Cherokee's computer modules isn't responding properly and the system needs a "proxy align". This can be done using an app called AlfaOBD and an OBD2 adapter such as a vLinker MC+. If you search this Forum there's a lot of detail on this and the process. BUT, my hope would be the electric parking brake (EPB) module and/or drive train control module (DTCM) are shorting and causing the car not to see the module(s) as operational thus your proxy align/flashing odometer is just telling you one of the modules is not working and will clear itself once the defective module is replace. This is much easier (and less expensive) than a PTU replacement.​

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Hope some of this helps.
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@bakejurns As for the gas issue listed above by @Gary Kline the part is also from Autozone and having replaced mine is fairly easy. I didn't need to jack or take my wheel off but you may need to at least jack. Part is $35 Duralast Evaporative Emissions System Leak Detection Pump ESM1002

3. Good chance it's the PTU but per your EPB issue above (#2), the module that controls the 4WD, called a Drive Train Control Module or DTCM is ALSO located in the trunk area near the spare tire. I would highly suggest checking for water/moisture back there since you've got two modules in the same are exhibiting problems. It could just be that the module is intermittent due to a moisture issue.

On top of this, see if you can have any codes pulled. While at AutoZone, they can do this for free if you don't have a code reader at home.

4. Flashing odometer means one of your Cherokee's computer modules isn't responding properly and the system needs a "proxy align". This can be done using an app called AlfaOBD and an OBD2 adapter such as a vLinker MC+. If you search this Forum there's a lot of detail on this and the process. BUT, my hope would be the electric parking brake (EPB) module and/or drive train control module (DTCM) are shorting and causing the car not to see the module(s) as operational thus your proxy align/flashing odometer is just telling you one of the modules is not working and will clear itself once the defective module is replace. This is much easier (and less expensive) than a PTU replacement.

The later here sounds like the culprit to at least your parking brake module. If the EPB module is not a free fix from Jeep, you can pick it up for ~$75 on eBay and follow instructions from the TSB:

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https://static.nhtsa.gov/odi/tsbs/2016/MC-10191415-9999.pdf

called a Drive Train Control Module or DTCM is ALSO located in the trunk area near the spare tire

This is easy to access and assess if it's wet. You can also open the module up pretty easily and take a peek for any signs of moisture. If you do believe this has been exposed, I have a DTCM that might work for your ADII Jeep. It didn't work for mine as I have a Trailhawk (ADII Lock), but it came off a very similar vehicle as yours and likely has the same software. You could have it for the cost of shipping, but you would need AlphaOBD for Android or Jscan for iPhone if you want to replace it yourself.

Here's a little about me diagnosing my SVC 4WD issue with the removal of my DTCM: https://www.jeepcherokeeclub.com/posts/3059626/

 

One more thing... Depending on which AD unit you have, the EPB issue could be it auto-engaging to hold the car in Park if your PTU is an AD2 unit and your car has determined it's lost connection with your transmission (Search this forum for the "worn splines" issue/TSB). The reason I mention this is you noted the cold affects it. The Cherokee determines when to auto-engage 4WD on certain weather conditions when it thinks traction may be less than optimal. The cold (registered by the temp sensor) is one of the things it auto-engages. If the AD unit is slipping (and has the 'worn splines' issue), that could potentially explain the parking brake as well as "axle sounds" (the PTU has engaged and the input shaft is slipping etc.)

Just mentioning it to be through since it's a known issue. Key is whether you have an AD2 unit.

 

Where do I start…

Hi,

Quick question : concerning the park brake, what did you mean by ''I got it to release by something I read in a forum but now it’s just inoperable'' ?
Thx.

 

I hate to say it, time to sell it?

 

If you don't go off road why would you buy a Jeep???

 

In my case, the only 'off road' the KL ever sees is an occasional gravel driveway. When I bought mine it was about the only mid-sized SUV in my price range still available with a V6. I'm hoping the easy life it leads will save me from the usual PTU/RDM issues, but who knows. Only time will tell.

 

so no problems with the engine at all?

 

Stop filling the vehicle while it's running. How did this once whenever our very first got my TH. 2 mi down the road same outcome. Pull the handle and whenever it stops the vehicle is full. Don't top off. Topping off for any vehicle is bad. I've never had the issue again.