Accidental downshift a possibility with 2012 Auto? - JeepForum.com
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post #1 of 29 Old 06-27-2012, 10:37 AM Thread Starter
Hillsitter
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Accidental downshift a possibility with 2012 Auto?

Perhaps a naive question folks but given the new transmission and shifter in the 2012 (I have a 2 door Rubicon) - it looks easy to accidentally downshift to 1 from 5 (Drive) at 70mph on the highway.

Are there protections built into the system to keep this from happening?


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post #2 of 29 Old 06-27-2012, 10:44 AM
paul olllllllo
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You cant go to 1 at 70mph, however you can go to 4. IMHO there should be some sort of button to push to activate this feature. I do not accidentally shift too often with my Wrangler by I do it all the time with my Challenger.

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post #3 of 29 Old 06-27-2012, 01:24 PM
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I believe the computer will not allow it. I haven't tried it on this vehicle, but on others, I would receive a "shift denied" or similar message.

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post #4 of 29 Old 06-27-2012, 01:59 PM Thread Starter
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Seems like a scary thing to try - but I like the comfort that 'the computer won't allow it' :-)

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post #5 of 29 Old 06-27-2012, 03:00 PM
1AAdam
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mythbusters has done something on this with an older car. they went from drive to reverse and the car just shut down and stayed in neutral. i would think the same kind of thing might happen in your situation.

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post #6 of 29 Old 06-27-2012, 03:10 PM
1AAdam
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doesn't the shifter have some kind of button u have to push to move it into the 'wrong' gear? or is it that staggered, step type shifter?

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post #7 of 29 Old 06-27-2012, 03:14 PM
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Quote:
Originally Posted by 1AAdam
doesn't the shifter have some kind of button u have to push to move it into the 'wrong' gear? or is it that staggered, step type shifter?
The gear lever can be pushed over to the left w/o a button to engage it first
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post #8 of 29 Old 06-27-2012, 04:00 PM
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you can push the lever all you want the TCM will NOT shift if its not safe to do so ( jeep speed to high or two low of rpm to down shift)

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post #9 of 29 Old 06-27-2012, 04:37 PM
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No really comparing apples to apples, but while riding with my cousin once he shift from drive to 2nd gear. This was at 70mph! Needless to say it blew a hole through the side of his transmission the size of a grapefruit. It was enough to teach me to be VERY careful about shifting unless you know your vehicle.


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post #10 of 29 Old 06-27-2012, 04:44 PM
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well to tap shift to 1st from 5th would mean 4taps? I know i can go to D by holding it right. Off road in low in a Rubi if you are say rolling in 2nd and happen to tap first better have your seat belt on ...... going up gears i know there is no nany at all, you can hold redline in every gear until the fuel cuts off as a rev limit. My last pontiac would shift up once it hit red line no matter what gear you are in, it was a 5 speed as well. the new auto is a huge improvment over the past, not even in same club. the 580 seems to be a beast.....so far. My 580 says from germany it was a early 012 bought in 011 about oct.

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post #11 of 29 Old 06-27-2012, 04:49 PM
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I'm assuming the 2012 automatic has some kind of taptronic or shiftronic computer controlled shifting system? I don't know I have a standard.

The computer won't let you downshift to a gear if you are going fast enough to over rev the engine in that gear. It has been like that since the systems were first implemented years ago. I tried on a rental car once. If it is the staggered type you can move the shifter to that gear (say first for example) but the transmission won't actually go to it.

The computer will chuckle to itself quietly all the while logging that its driver is some sort of dingus who tries to go 70 MPH in first. As you repeat this over and over the computer develops disdain for you and begins to subtly change the driving characteristics of the Jeep. It plots, and waits for its moment to be free from the guy trying to blow up the motor. Then, one day when you're on the offramp hurrying to get to Wendys because you're starving, it kicks on the ESP and catapults you off the circular offramp into a tree. You have been warned.
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post #12 of 29 Old 06-27-2012, 06:27 PM Thread Starter
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Thanks for all the posts folks.

For the record I'm not intending to shift into 1st while going 70. I'm considering a scenario where my wife reaches around to get something from the back seat and accidentally leans into the shifter. You don't have to move it much - just a tap from center to left to engage the downshift feature.

It sounds like the transmission is smarter than that and wouldn't allow for the downshift if you are at speed.

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post #13 of 29 Old 06-27-2012, 06:58 PM
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Quote:
Originally Posted by kade
you can push the lever all you want the TCM will NOT shift if its not safe to do so ( jeep speed to high or two low of rpm to down shift)
Oh I agree. I'm just saying u don't need to push a button first.
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post #14 of 29 Old 06-27-2012, 07:03 PM
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Quote:
Originally Posted by LIJeepJC View Post
Oh I agree. I'm just saying u don't need to push a button first.
im sorry i guess my post came of as i was addressing it to you,

i was just posting to the op


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post #15 of 29 Old 06-27-2012, 09:24 PM
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On my 09, I can move the shift lever from D into 2 but the gear won't change until the speed slows down so when the 2nd gear engages, the engine doesn't over-rev. There is a lockout mechanical shift that prevents the shift lever moving from D or N into Reverse when the Jeep is traveling at a certain speed. Pushbutton shift works the same way for down shift. The computer won't lower the gear until the engine rev is below the safe limit.


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