"Service Shifter" MIL - '15 Diesel - JeepForum.com
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post #1 of 12 Old 05-31-2016, 07:31 AM Thread Starter
blz5k
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"Service Shifter" MIL - '15 Diesel

Hello all -

I searched the forum but didn't find much about this topic. I've seen it mentioned on other forums related to the Cherokee, but none about the GC.

I bought a pre-owned '15 EcoDiesel with around 23k on it in January. I love the thing, but now it's coming down with some weird symptoms and I'm starting to get a little annoyed with it. Hoping someone can help here, since my dealer doesn't seem interested in touching it.

A couple weeks ago, the info system freaked out and gave me a MIL with "Service Shifter." Everything still ran properly, but the MIL stayed on. I made an appointment with the dealer to take a look at it, but by then the MIL had shut off. Picked it up from the dealer who said they couldn't find anything, leave the shop and the MIL comes back on and my entertainment system (including bluetooth) cuts out a couple miles down the road. Drove it back and they pulled the attached list of "U" codes from it, said it was fine to drive and to bring it back when they were a little less busy. Okay, fine.

Driving it this weekend, the message comes back, and this time it won't shift out of 3rd gear, while I'm on a downhill, desperately needing it to shift. I pulled off the road, put it in park and back to drive, and all was better, except for the lingering MIL. I called the dealer this morning, and again, they're too busy to chase down communication errors.

All I know thus far is that it strangely happens only when I turn left. I hope someone's had this issue and can advise me on my next steps. I'm going to try and get it in to another dealer that's not "too busy to trace out comm errors."

Thanks all.

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post #2 of 12 Old 05-31-2016, 08:44 AM
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Quote:
Originally Posted by blz5k View Post
Hello all -

I searched the forum but didn't find much about this topic. I've seen it mentioned on other forums related to the Cherokee, but none about the GC.

I bought a pre-owned '15 EcoDiesel with around 23k on it in January. I love the thing, but now it's coming down with some weird symptoms and I'm starting to get a little annoyed with it. Hoping someone can help here, since my dealer doesn't seem interested in touching it.

A couple weeks ago, the info system freaked out and gave me a MIL with "Service Shifter." Everything still ran properly, but the MIL stayed on. I made an appointment with the dealer to take a look at it, but by then the MIL had shut off. Picked it up from the dealer who said they couldn't find anything, leave the shop and the MIL comes back on and my entertainment system (including bluetooth) cuts out a couple miles down the road. Drove it back and they pulled the attached list of "U" codes from it, said it was fine to drive and to bring it back when they were a little less busy. Okay, fine.

Driving it this weekend, the message comes back, and this time it won't shift out of 3rd gear, while I'm on a downhill, desperately needing it to shift. I pulled off the road, put it in park and back to drive, and all was better, except for the lingering MIL. I called the dealer this morning, and again, they're too busy to chase down communication errors.

All I know thus far is that it strangely happens only when I turn left. I hope someone's had this issue and can advise me on my next steps. I'm going to try and get it in to another dealer that's not "too busy to trace out comm errors."

Thanks all.
Hey blz5k,

I'm sorry you're having an issue getting your vehicle serviced. Please let me know if I can help make an appointment for you.

Kori
Jeep Social Care Specialist
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post #3 of 12 Old 05-31-2016, 11:19 AM
AtomicJoe
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The shifter is pretty easy to disassemble, as the top "cover" bit with the letters on it just snaps on. There is a stationary connector that the top part plugs in to on the actual shifter stalk. If this part is loose or has a bad connection I can imagine that it will throw a service shifter light. If it were me I'd start there.

If you want to remove it and check it's pretty easy. Make sure the jeep is off and don't turn it back on without having the stalk assembled as it will disable the shifter and throw a MIL. with the car off simply grab up under the chrome trim strip at the top with your fingernails or a non marring pry tool and pull straight up. It will unplug and snap off. Check the connector and the plug up underneath the top piece. It kind of resembles an old video game cartridge connector. Clean if necessary and then replace it.
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post #4 of 12 Old 05-31-2016, 11:23 AM
ColdCase
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Someone years ago had something similar and it turned out to be one of the transmission speed sensors being bad and throwing garbage onto the CAN Bus (different transmission than yours). It took the dealer a couple days to figure it out. Sometimes a bad ground will cause a multitude of strange symptoms, perhaps one that loosens up on a left turn? These can be a bear to isolate, good luck.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #5 of 12 Old 06-15-2016, 07:30 AM Thread Starter
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So quick update to this for anyone who's looking for further information.

On Friday, after the MIL went off for a few days, it went haywire again. This time it gave me the Service Shifter message, followed by the MIL coming on, followed by everything shutting down, then restarting and saying "Service Transmission Shut Off Engine to Engage Park."

So I pulled over, shut it off, put it in park, and called the dealer right away. Dropped it off Saturday morning, and the most recent update from them is that they had to contact FCA's engineers to try and diagnose the problem. I gave them a printout of this whole thread with your suggestions, hopefully they can find something. I'll follow up with an update when I finally hear back about it.
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post #6 of 12 Old 06-20-2016, 02:29 PM Thread Starter
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Yet another update, partly so I can keep track, and partly so I can try and help others who may come across this issue.

So I got my Jeep back on Wednesday, the dealership said that they were completely unable to find anything, as the MIL went off as soon as they connected it to the system. Drove it Thursday, instantly it was back to it's old ways. I even recorded videos of it happening, every single time I made a left turn - regardless of speed (at speed or from a stop).

As I drove it over the weekend, though, it seemed to get worse - almost like plugging it into the diagnostic machine angered it or something. It got downright dangerous. Making a left turn, it shifted itself into neutral - and wouldn't let me shift into Drive without pulling over, shutting the engine down, and starting it back up.

Then this morning - on my way to the dealership to drop it back off - I took a left-curving exit ramp off the highway - and the damn thing tried to shift into reverse - at highway speeds! This time it didn't just let me drift off onto the shoulder, it damn well made me stop in my tracks on the exit ramp.

Mapped out a course to the dealership making only right turns from then on, and left it with them with the stern warning that I don't want it back unless its repaired.

So... does anyone have any experience with warranty replacements?
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post #7 of 12 Old 06-20-2016, 03:10 PM
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Did they not test drive it and follow up on your left turn cause? I would try going to another dealer, if they still can't figure it out.
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post #8 of 12 Old 06-20-2016, 05:15 PM Thread Starter
blz5k
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They say they did. There was 10 more miles on the jeep than when I dropped it off. Usually takes a few miles for it to happen.

Honestly, I'm taking it to the same dealer this time because I'm anticipating FCA replacing the thing. I wouldn't really feel comfortable taking this thing on a long trip even if they say the issue is fixed.
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post #9 of 12 Old 06-21-2016, 11:47 AM
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Good luck, I hope they can replicate the issue but can't fix it, and they give you a brand new trouble free replacement! I'm pullin' for ya! =)
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post #10 of 12 Old 06-24-2016, 10:35 AM Thread Starter
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I've never heard a service advisor as happy as mine was yesterday afternoon. They found the issue and fixed it, then even drove it 70 or so miles to make sure it was fixed.

The problem came down to a wiring harness in the undercarriage, near the cat converter. The harness is normally held by a pin into the frame, but the pin had come loose, dropping the harness to contact the heat shield. That in turn chafed the insulation off the wiring, and when I'd go left, the wires would contact the heat shield and send a short through the system.

Very happy to have my Jeep back. And special thanks to the techs at Tate Jeep in Glen Burnie, MD for working so hard to diagnose and repair this crazy issue.
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post #11 of 12 Old 06-24-2016, 12:31 PM
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Most tech dread intermitted electrical issues, and I'm sure they were thrilled that this was so obvious.

Thanks for the update.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #12 of 12 Old 06-24-2016, 02:18 PM
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Quote:
Originally Posted by blz5k View Post
I've never heard a service advisor as happy as mine was yesterday afternoon. They found the issue and fixed it, then even drove it 70 or so miles to make sure it was fixed.

The problem came down to a wiring harness in the undercarriage, near the cat converter. The harness is normally held by a pin into the frame, but the pin had come loose, dropping the harness to contact the heat shield. That in turn chafed the insulation off the wiring, and when I'd go left, the wires would contact the heat shield and send a short through the system.

Very happy to have my Jeep back. And special thanks to the techs at Tate Jeep in Glen Burnie, MD for working so hard to diagnose and repair this crazy issue.
You'd think that with such a critical bundle of wires passing so close to something like the cat, there would be some kind of fall back attachment of some type like a small cradle welded to the frame, another pin post, or hey maybe some zip ties.
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