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  #1  
Old 11-25-2014, 07:10 PM
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2015 Trailhawk issues

I have a new 2015 Trailhawk with stop-start and 4:08 gearing. It has 1500 miles on the clock. I love this vehicle, but I have noticed a few issues and wondered if anyone has seen the same issues.

1) radio changes from FM to AM within the first 30 seconds of starting the engine. This happens when still in park, no hands on the wheel, just me in the seat and looking at my cell phone. Never happens again with key on.

2) NO 9th gear EVER.. ( I have tried fast, slow, up hill, down hill, cruse on, cruse off, manual shifting and in "D")

3) NO 8th gear when the cruse is ON, it just hums along in 7th for mile after mile at about 2250rpm @ 70 MPH [MPG at 19 on flat ground]

4) With cruse OFF, I can get 8th gear on flat ground, 70 mph, but I must tip into the throttle, then let off to get it to shift. It will hold 8th till the slightest incline then back to 7th. [8th shows about 1850 RPM and 24 MPG]

5) At highway speed, with 4x4 set to AUTO .. I get a LOUD nosy rumble with noticeable vibration in the rear of the vehicle when a) move the shifter left from "D" to manual. [OR] b) hit the traction control button. I suspect the rear axle kicks on, but why?

Note: 1st through 7th gear shift fine, but as other have mentioned, I have noticed a "speed up" feeling when it down shifts.


I have not talked to the dealer yet, but I will visit in the next week or two.

Any input will be appreciated. Thanks for looking...

Newbee

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  #2  
Old 11-25-2014, 10:29 PM
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Re: 2015 Trailhawk issues

I also have a 2015 Trailhawk. I have not noticed issue #1, but issues 2,3&4 are exactly the same on mine. I do not have issue #5. Mine has 3500 miles at this point.
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Old 11-26-2014, 09:00 AM
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Re: 2015 Trailhawk issues

Yea issue one is a mystery to me, sound like a head unit issue.

The rest of it I haven't seen and I'm approaching 1000 miles. I also haven't touched the "manual" process. From what I've read, it does more harm than good.
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Old 11-26-2014, 09:08 AM
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Originally Posted by Tibault View Post
Yea issue one is a mystery to me, sound like a head unit issue.

The rest of it I haven't seen and I'm approaching 1000 miles. I also haven't touched the "manual" process. From what I've read, it does more harm than good.
Tibault, under what situations have you seen your Trailhawk use 9th gear. Thanks.
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Old 11-26-2014, 09:10 AM
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Re: 2015 Trailhawk issues

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Originally Posted by dldoom View Post
Tibault, under what situations have you seen your Trailhawk use 9th gear. Thanks.
As far as I know it hasn't, but I don't put it in "manual" mode to see what gear the vehicle is sitting in.
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Old 11-26-2014, 12:42 PM
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Re: 2015 Trailhawk issues

I have a 2014 TH with 9,000 miles on the clock and have had zero issues to date.
Your number (1) issue sure appears to be a problem with the radio head as another poster has said.
I have only seen 9th a few times and that is always on a very flat stretch doing over 80 MPH.
I would give your transmission some more time to "learn" your style of driving, I truly think you will see improvemnt.
As for the rumble/vibration i would suspect a problem with one of the tires being either out of round, out of ballance or a broken belt in one of them. There should be no noise at all. You do have to realize the Firestones do have and aggresive tread pattern so you will get some road noise compared to say a Michelin Tour that would come OEM on the Limited.
This is my 7th Jeep and I think they have done a superb job creating the new Cherokee. best of luck.
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Old 11-26-2014, 08:36 PM
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Re: 2015 Trailhawk issues

@one_rusty_jeep - I have not had any of the issues 1 - 5. Today I noticed about 1600 RMPs at 59 mph and checked - it was in 8th gear. I can get mine to hit 9th at 80+ mph either going downhill or flat with a tail wind. I'm at 2600 miles.
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Old 11-26-2014, 10:23 PM
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Re: 2015 Trailhawk issues

Hi, thanks for the reply ! I thought it was related to the tires, but the noise and vibration clearly turn ON when I move the shifter to the left position (displaying the current gear) and the noise and vibration stops about 3 seconds after I return to D.
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Old 11-26-2014, 10:31 PM
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Re: 2015 Trailhawk issues

Thanks for all the feedback everyone !
Update with more driving: 8th gear does hold when I drive about 60mph, but still drops out at 70 mph or over .. I typically drive 72 -73 max. Driving 80 to use 9th gear .. hmmm seems like a speeding ticket.

I will also update this post with any information I get from the local dealer.
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Old 11-27-2014, 12:21 AM
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Re: 2015 Trailhawk issues

Quote:
Originally Posted by one_rusty_jeep View Post
Thanks for all the feedback everyone !
Update with more driving: 8th gear does hold when I drive about 60mph, but still drops out at 70 mph or over .. I typically drive 72 -73 max. Driving 80 to use 9th gear .. hmmm seems like a speeding ticket.

I will also update this post with any information I get from the local dealer.
Don't understand why a transmission would hold 8 at 60 but drop out at 70+ unless catching a head wind or going uphill.

A number of states have 80 mph speed limits in sections. Also, the KL was built as a global car so 9th gear might be useful on autobahns.
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Old 11-27-2014, 09:50 AM
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Re: 2015 Trailhawk issues

Yea, good point about global usage... 9th gear may not work in Michigan. But for sure 8th should hold at 70mph. Time will tell.
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Old 11-27-2014, 12:46 PM
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Re: 2015 Trailhawk issues

From TFlcar by Chad Kirchner:

"I reached out to Chrysler to see about 9th gear and what conditions the Cherokee would use it. Eric Mayne, Media Relations Manager for Engineering and Powertrain told me that the vehicle is constantly analyzing the current conditions and will use 9th gear if necessary, though itís not that often. One thing he did point out is that using nine gears allows the engineers to have a 9.81 gear ratio speed overall, which helps them eek out fuel economy and still be an effective off-roader. So even though you may never see 9th gear (and believe me, I tried), itís still being used by the engineers for overall performance."


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