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Unread 04-01-2014, 01:27 PM   #1
Taki
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Join Date: Oct 2012
Posts: 3
Transmission shifts into fourth gear by itself.

I have a 2008 jeep commander 5.7 liter hemi. Transmission shifts into 4th by itself and stays in 4th until I pull over shut off car then restart it

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Unread 04-01-2014, 02:38 PM   #2
Taki
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Join Date: Oct 2012
Posts: 3
Quote:
Originally Posted by Taki
I have a 2008 jeep commander 5.7 liter hemi. Transmission shifts into 4th by itself and stays in 4th until I pull over shut off car then restart it
Anybody know what is wrong?
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Unread 04-01-2014, 09:17 PM   #3
mmerlinn
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Join Date: Sep 2010
Posts: 354
I am confused.

Automatics are supposed to automatically shift into 4th. However, they are also supposed to automatically shift out of 4th.

A standard transmission is not supposed to automatically shift into any gear, else you could easily wind up in two gears at once.
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Unread 04-02-2014, 01:32 AM   #4
jnicewan
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1995 ZJ 
 
Join Date: Dec 2010
Location: Norman, OK
Posts: 2,076
I would assume the trans is going into "limp mode", but pretty sure that would give you 3rd gear but not totally sure, since certain years and models changed a bit. Limp mode occurs when the TCM finds a fault with the trans, wiring or sensors and it basically shuts down. The gear ranges you could get would probably be limited to what you could get with manual shifting. There are numerous things that can cause this problem and guessing would be difficult but I would suspect a trans input/output speed sensor is the culprit.

Anyway, what you probably need to start with is getting your Jeep scanned for codes. You are going to need a bigger/better scanner that has the ability to communicate with the trans control module (TCM). IF you pull codes from the PCM you might only find a P0700 which is an information DTC to tell you there is a stored fault code within the TCM.
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