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Unread 10-26-2013, 08:12 AM   #1
batsona
Registered User
2007 WK 
 
Join Date: Nov 2012
Location: Ellicott City, MD
Posts: 7
Trans stuck in Limp-Mode

I'll post my experiences here, so others can know / benefit if this happens to them. I've got a Jeep Grand Cherokee 2007 with the V6 3.7L engine. It's a 4WD with the 'Mercedes' transmission.

Once this week, I started out in the morning, when it had been ~35F overnite. Transmission in limp-mode. there was a status on the dash, "TRANSMISSION OVER TEMP" where the temperature is usually displayed. Check Engine light on, as well as the "ESP BAS" light. Would not advance from 1st gear. Pulled over and stopped/restarted engine. Everything OK after that. --until the next morning.

Same thing, cold morning, and transmission in Limp-Mode. This time I couldn't get it out of Limp-Mode, no amount of stop/restart would help. I had to stay home from work, so I decided to try to avoid a repair... I took terminals off the battery for 30min, then re-connected - no dice. I then decided to rip apart the center console and take the shift-module out & clean it with isopropol alcohol. Re-assembled, and no change. Still limp-mode.

After working for 4h on it, I called the tow truck & towed to the nearby Jeep dealership. I've got a service contract on this jeep, so I'm not too-too-woried about cost. Awaiting call-back. I'll post status here, just so everyone can benefit.

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Unread 10-26-2013, 03:06 PM   #2
tom19511
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2006 WK 
 
Join Date: Mar 2009
Location: Sheffield Lake, OH
Posts: 321
See this:


http://www.jeepforum.com/forum/f67/t...-mode-1067011/
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Tom19511
tchristopher1@wowway.com
2006 Grand Cherokee Laredo 3.7
2007 Liberty Sport 3.7
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Unread 10-26-2013, 05:06 PM   #3
batsona
Registered User
2007 WK 
 
Join Date: Nov 2012
Location: Ellicott City, MD
Posts: 7
I looked thru that thread -- thanks! The last thing I did before calling the tow truck, was to rip apart the center console, and I found & cleaned those contacts & the ckt board - which did no good unfortunatly. That thread had alot of people who had the same problem but no one had posted any resolutions..
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Unread 10-29-2013, 02:48 PM   #4
batsona
Registered User
2007 WK 
 
Join Date: Nov 2012
Location: Ellicott City, MD
Posts: 7
OP here: OK, just got back from the dealer. New Transmission Control Module (TCM) for $269. p/n is RL150240-AB. Runs perfectly now. Interestingly, it seems a bit tighter in 2nd gear... Going around slow curves in my neighborhood (no stop sign), when I put my foot on the gas to pick up speed, it throws me aginst the back of the seat, where I have to ease up on the accelerator a bit. Now I just need to have that transmission service done, along with both differentials & transfer case, and I should fly down the road.... I'm only getting ~17Mpg on this 3.7L.
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