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Old 04-29-2015, 11:59 AM
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2015 - Hesitation from stop - transmission issue?

My 2015 Limited has major hesitation from a stop. For example, if I'm making a left turn against traffic and hit the gas, the Jeep will creep forward while the engine races for about a second until it slams into a lower gear and shoots across the intersection. This happens in all shift modes, though it's worse in Eco. It does seem to get a little better as the car warms up, but never quite goes away. Once it gets moving, it shifts fine into all other gears.

I had hoped it would get better with break-in, but I'm at nearly 5K miles with no change. I also considered that it might just be a quirk of driving a diesel. However, given the fact that the rpms go up but the car doesn't move, I'm thinking it's a transmission issue.

I'll be taking it to the dealer, but curious if anyone else has experienced this.

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Old 04-29-2015, 12:36 PM
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Re: 2015 - Hesitation from stop - transmission issue?

Mine does that also. Here's what I think is going on. The first is turbo lag. When you first step on the gas, the pressure in the interstage between the turbo and the engine drops. As the engine starts to windup, the turbine speeds up and the pressure recovers, so the engine gains more power. The other thing is that the power curve on a diesel is much steeper than on a gasser. The torque reaches its massive 420 ft-lbs at only 2k. A gasser takes to about 3k to reach its lower torque. So I've noticed it's you step on the gas, wait a moment, then you're shot out of a cannon!
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Old 04-29-2015, 01:43 PM
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Re: 2015 - Hesitation from stop - transmission issue?

Yeah, I've had this a few times when trying to cut across an intersection or something to that effect from a dead stop - it's totally turbo lag. It's not shifting, it's trying to build up pressure for the engine. You can try and offset this by doing a manual launch (one foot on the gas pedal, the other on the brake, slightly depress the gas while holding the brake down until your RPMs hit 1k or so) this will spool the turbo and help a little bit. It also helps to have the engine in sport mode - it will keep the RPMs higher which means less turbo lag.
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Old 04-29-2015, 02:02 PM
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Re: 2015 - Hesitation from stop - transmission issue?

A couple things I have learned.

First, if you have Hill Start Assist, turn it off, it will hold the brakes and make this issue seem worse. Its not supposed to have an effect below a certain incline but it made a difference for me.

Other issue, if you are not at a complete stop the transmission does not like to drop into 1st. So a very slow roll has you in second gear, when you punch it, it still has to shift down. I don't find it to be an issue but it does take some getting used to.

All this along with the diesel turbo lag can cause interesting acceleration.
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Old 04-29-2015, 02:22 PM
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Re: 2015 - Hesitation from stop - transmission issue?

I'm with rab4225. Turned the hill assist off on me 2014 and it made a big difference.
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Old 04-29-2015, 08:51 PM
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Re: 2015 - Hesitation from stop - transmission issue?

Quote:
Originally Posted by rab4225 View Post
A couple things I have learned.



First, if you have Hill Start Assist, turn it off, it will hold the brakes and make this issue seem worse. Its not supposed to have an effect below a certain incline but it made a difference for me.



Other issue, if you are not at a complete stop the transmission does not like to drop into 1st. So a very slow roll has you in second gear, when you punch it, it still has to shift down. I don't find it to be an issue but it does take some getting used to.



All this along with the diesel turbo lag can cause interesting acceleration.

+1 spot on.


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Old 04-29-2015, 09:42 PM
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Re: 2015 - Hesitation from stop - transmission issue?

Does it make any diff to use sport mode and paddle shift?
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Old 04-30-2015, 03:58 AM
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Re: 2015 - Hesitation from stop - transmission issue?

Quote:
Originally Posted by rab4225 View Post
A couple things I have learned.

First, if you have Hill Start Assist, turn it off, it will hold the brakes and make this issue seem worse. Its not supposed to have an effect below a certain incline but it made a difference for me.

Other issue, if you are not at a complete stop the transmission does not like to drop into 1st. So a very slow roll has you in second gear, when you punch it, it still has to shift down. I don't find it to be an issue but it does take some getting used to.

All this along with the diesel turbo lag can cause interesting acceleration.
Rab4225: How do you turn Hill Start Assist off?
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Old 04-30-2015, 05:38 AM
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Re: 2015 - Hesitation from stop - transmission issue?

I also get this, turning from the top of my hill out into traffic, so the car is a bit cold. I don't think its turbo lag because the revs are up no problem, the trans just doesn't engage. I think its the torque converter taking a bit longer to grab when its cold.
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Old 05-01-2015, 07:54 AM
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Re: 2015 - Hesitation from stop - transmission issue?

Quote:
Originally Posted by mbaessler View Post
Rab4225: How do you turn Hill Start Assist off?
RTFM:
Uconnect Settings -> Safety & Driving Assistance -> Hill Start Assist
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