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Old 05-07-2016, 11:55 AM
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HELP!! Transmission/shifting issues...

Hello all. New to this forum. Just purchased a 2007 Grand Cherokee Limited, 5.7 Hemi, 4x4 w/ Quadra Drive II. It had 71,500 miles on it when I purchased it. Literally in mint condition with every option. I've had it about 2 months and only have 2,000 miles on it. Installed OME HD springs and Bilstein struts for a lift and some good tires/wheels. Truck has driven perfectly and only taken off road twice. Just wanted to give the background...

I just drove 3 hours from the Phoenix area up to Pinetop, AZ last night and as I got in to town going down the street at 45 mph or so the transmission "clunked" a couple of times. It stalled pulling out of a parking lot as well. Check engine light came on, Electronic Stability Program light, and Electronic Throttle Control light is continuously flashing. The owner's manual says the flashing throttle control warning light indicates immediate service required. Could that be tied to a throttle body issue? I pulled in to O'Reilly's and they checked the codes. I am getting the following:
U0184 - Lost communication with radio
C121C - Torque Request Signal Denied
P0129 - Barometric Pressure Too Low
P0884 - TCM Power Input Signal Intermittent

Granted, I am at 7,000 ft elevation, but I still can't imagine getting a Baro pressure too low... My Ford Explorer never had those issues. The transmission/shifting is behaving more erratic now. Just driving down the side streets near the cabin it behaves very weird. I drove the 5 miles to the store and it seemed fine when I was doing 50 mph, but it had got a little worse after that. I had done a little research and it seems that simply cleaning the electronic shift module could help? I know it was pretty dusty last time we went off road. I figured I could at least do that at the cabin up here and see if it works enough to get me back to Phoenix. When I disconnected the battery this morning and reconnect I also heard a rapid clicking noise up near the passenger side firewall. That noise has been there before, but it appeared tied to the A/C. When I when turn recirculation/max ac on it would go away. I figured it was the blender door.

So, not sure what is really going on here. Any help would be appreciated. I guess I should have bought the extended warranty from the credit union with my loan for $30 a month! But, I am still allowed to add that.

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Old 05-07-2016, 12:08 PM
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Re: HELP!! Transmission/shifting issues...

Wanted to add a couple other observations after doing some research online. It seems I have having some similar problems others have had, but not all the same indications and codes. Another reported the same issue that driving down the road at constant speed (40 mph-is) the transmission would thump, a quick speed and rpm drop, the panel would ding at you once, then back to smooth running. It appears this could be tied to a dirty electronic shift module, or it may need a new one? But I am still confused about the baro pressure too low and electronic throttle control. I'm not really in a place where I can do much work on it. Pulling the ESM and cleaning it won't be hard to do, but that's about all I could do up here at the cabin.
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Old 05-07-2016, 01:53 PM
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Re: HELP!! Transmission/shifting issues...

The P0129 code can be due to a bad MAP sensor or wiring. The MAP input is the most important input for the fuel injection calculations. With a too low measured MAP signal, the engine will get less fuel then needed and can eventually stall.
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Old 05-07-2016, 02:56 PM
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Re: HELP!! Transmission/shifting issues...

Thanks for that tip Frank. I went back out and looked under the hood again. I had to take the truck back to the alignment shop and they had to redo the front right strut. To do that they pulled the airbox... Well, they never clamped the box back shut. So, I am wondering if that could be a culprit in some way. The computer is getting weird readings at different times at this high altitude (7,000'). I had gone back out and started the engine and it ran rough. I pulled the negative terminal and pulled out all four PCM connections and reconnected and it started and idled great. I could have jarred the airbox closed when I was messing with it. Now to go drive it with the airbox sealed and the computer reset from removing the negative terminal. I am also wondering if they did something to the wiring harness going in to the PCM. I may just run down to O'Reilly's and buy a new MAP sensor anyways. This is frustrating... It was going to be a great relaxing weekend at the cabin with the 8 month old chocolate lab getting to hike in the forest for the first time. Now I am stuck trouble shooting my truck...
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Old 05-07-2016, 04:27 PM
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Re: HELP!! Transmission/shifting issues...

Well, another quick update. It's still doing it even after messing withe PCM connections. After stopping by O'Reilly's again I am leaning toward this scenario... With the air box left open, the intake sucked in some dust. I have had zero issues with this truck until after that. Could have fouled the MAP sensor possibly. Coming up to this high altitude mixed with a dirty sensor might be connected? I just pray to God that my engine is not trashed. Going to replace the MAP sensor right now and see if that clears the problem. I am still wondering about the TCM power input signal intermittent. Since that error code is connected to a scenario of the vehicle moving could the shop have damaged the front right ABS sensor as well?
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