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  #1  
Old 12-10-2015, 04:29 PM
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Transmission Slipping

I have a 2013 (MY14) Grand Cherokee diesel with the 8 speed transmission.
The car is reversed into my garage and has to run forward (obviously) up the drive to get out.
Occasionally, it struggles to get up the drive with lots of revs and not much action. (Occasionally being maybe 1 in every 20 - 25 starts).
The car has been back to the dealer for this issue on several occasions, but of course I can't get it to perform because of its' intermittent nature, and only when cold.
They have checked fault codes, transmission fluid level and software updates and can't find anything wrong.
I have found that if I get halfway up the drive when it's playing up, and stop and shift into reverse and back to drive a couple of times, then all is good.
Last time I went to the dealer, they suggested that I should warm the engine for a minute or two to allow the pressure in the tranny to build up. This doesn't sound right to me - surely modern cars can be driven straight off.
Anyone experienced anything like this, or have any thoughts?

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  #2  
Old 12-10-2015, 05:17 PM
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Re: Transmission Slipping

Actually, it does make sense to me but I'm not an engineer, just a driver with almost 50 years on the road.
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Old 12-10-2015, 05:25 PM
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Re: Transmission Slipping

A 2013 with an 8-speed transmission?

Anyway, this kind of behavior is often due to a failed converter drainback valve, though I don't know if whatever transmission you have in your GC has one..
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Old 12-10-2015, 05:28 PM
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Quote:
Originally Posted by Blackadder785 View Post
I have a 2013 Grand Cherokee diesel with the 8 speed transmission.
The car is reversed into my garage and has to run forward (obviously) up the drive to get out.
Occasionally, it struggles to get up the drive with lots of revs and not much action. (Occasionally being maybe 1 in every 20 - 25 starts).
The car has been back to the dealer for this issue on several occasions, but of course I can't get it to perform because of its' intermittent nature, and only when cold.
They have checked fault codes, transmission fluid level and software updates and can't find anything wrong.
I have found that if I get halfway up the drive when it's playing up, and stop and shift into reverse and back to drive a couple of times, then all is good.
Last time I went to the dealer, they suggested that I should warm the engine for a minute or two to allow the pressure in the tranny to build up. This doesn't sound right to me - surely modern cars can be driven straight off.
Anyone experienced anything like this, or have any thoughts?
Are you 100% its a 13 and not a early build 14? The 8speed didn't come with the 13's but the 14's and newer.

Sounds to me like it sometimes does not build up proper fluid pressure. So it may be just that its cold or that there is a problem with the fluid pump in the trans
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Old 12-10-2015, 05:54 PM
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Re: Transmission Slipping

Sorry about the confusion. The car is MY14 built in 2013. (I purchased it new in July '13)
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Old 12-10-2015, 05:57 PM
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Re: Transmission Slipping

you get 2013 my14 with 8 speed.

mine actually rolled back a fair bit when trying to accelerate from a stop trying to go uphill ( like as if it's in neutral ). As i live in the hills I do this every morning and it has only happened twice. it's also intermittent that the dealer can never fault it.

mine is 2013 my14 with 8 speed box too.
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Old 12-10-2015, 06:02 PM
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Re: Transmission Slipping

I get this when leaving home in the mornings too, dead start at the top of a hill. I give it some accelerator, but it is like the torque converter isn't engaging, a bit more revs and it eventually binds and starts moving forward. I don't get it so much once it is warmed up, or if I put it in sport mode.
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Old 12-11-2015, 06:43 AM
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Re: Transmission Slipping

These are all 2014s. Saying they are 2013s is just going to confuse everyone, because 2013s exist... a 2013 and a 2014 are quite different vehicles.
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Old 12-11-2015, 06:44 AM
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Quote:
Originally Posted by tukangbaso View Post
you get 2013 my14 with 8 speed.

mine actually rolled back a fair bit when trying to accelerate from a stop trying to go uphill ( like as if it's in neutral ). As i live in the hills I do this every morning and it has only happened twice. it's also intermittent that the dealer can never fault it.

mine is 2013 my14 with 8 speed box too.
Or just say its an early build 14 cuz your confusing people lol
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Old 12-13-2015, 08:29 AM
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Re: Transmission Slipping

I notice something Siloam with my '14. It's not as pronounced because I'm pulling out of the garage and going down my driveway. However that first minute after startup is like there is a disconnect between the drivetrain. A few seconds later, all is fine. I've just always figured it is the electronics holding things back until he proper temp or pressure is achieved.


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Old 12-23-2015, 02:46 PM
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Re: Transmission Slipping

Have the dealer drop the pan and check the valve body for a bent reverse valve retaining plate. This is what happened to mine. The screws were never tightened correctly and the retaining plate moved and let the reverse valve move out about 1/2 inch. They reattached the retaining plate using blue Loctite and the correct screw torque and the problem is gone.
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Old 12-23-2015, 03:32 PM
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Re: Transmission Slipping

Thank you Peckmv. What symptoms were you experiencing?
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