I had a very similar issue on my 05 HEMI at 141XXX, and it was because the solenoid pack and valve body in the transmission went out on me. Driving along and all of the sudden it felt like the tranny fell out of the vehicle, you hear a loud THUD, then a DING from the dash, at which point the CEL comes on. Sound familiar? Both the filters and fluid were done by the Jeep dealership about 6 months prior so I'm guessing that didn't contribute. It cost about $800 at the dealer to put right which I know was on the high end. But I didn't actually pay retail so it was worth having it done there to me. 3yr/36,000 mile warranty on the work.

 

P0700 is just the code the TCM sends to the PCM to turn on the engine light .
You need a code reader capable of reading the TCM . Superchips and other tuners will do it if you have .

 

Took mine to the dealer to get the same code read. They claim there is no reading the code and that they have to poke and prod around on the tranny to find the problem. I don't care cause it's under warranty so I'm not paying for it. But they can be rather tough to deal with. I'll keep you posted as to what happens with mine. Do the same

 

Just so you know, the dealer is throwing you a line of BS . The only reason P0700 exists is to tell you that there are codes stored in the Transmission Control Module as per the FSM .

 

From everything I've read on here that's what I figured. Thanks for the info though. I'm somewhat of a newbie as far as this goes so any info from the gods of jeeps is helpful. Thanks

 

So the stealership is claiming that it needs a PCM flash a transmission fluid flush. Sound true or BS

 

I would first check and see what the flash is for. They should be able to refer you to a TSB or at least what the TSB is supposed to cure. Have you had the N23 recall done ? . I would stronly suggest you not get it or read about it here so you are informed .
http://www.jeepforum.com/forum/f67/n23-recall-issue-no-4-low-1561787/

The Transmission flush goes againsed Chryslers own TSB , you can read about it here http://www.wkjeeps.com/TSB/tsb_wk_2600109.pdf

I would find out what codes were stored in the TCM . If they can't or won't tell you , my only advise would be to have them reset ALL codes and tell them you will see if they come back . Then i would go somewhere else .. IF the problem comes back anyways . IMHO I would never go any further then noting and erasing any code(s) untill it can be replicated . Then you know for a fact that it is a hard fault .

 

your shift module might simply need a cleaning. Search on this site for a write up on how to do this. Dealer will tell you it's not a serviceable part, but many here have cleaned it with great success

 

These are the flash updates that were done to the PCM

Hope these pics worked. After the flash update was done it fixed the transmission acting as though it was slipping out of gear like the clutch was pressed( I know it doesn't have a clutch). It also fixed the problem of the it coming to a stop and either stalling completely dead or the rpm surging up and down and the stabilizing. When I mentioned the TSB about the transmission not needing flushing the mechanic quickly changed his story to " it only needed a quart or two" which was filled for free ( I like free). With the problem fixed FOR NOW I will continue monitor to see if the problem returns. Hope this helps anybody with the same problems as I have seen on here but have found no solution to ( I may not have searched long enough). Thanks for everyone's help. There was also mentioned that a 3900 rpm limit was erased. I never remembered it having one as I have driven it past that before and since the flash update. Has anyone else had this rev limit?
And I just noticed I never gave any info on my jeep
05 wk
Hemi
QDII

 

These are the flash updates that were done to the PCM

View attachment 1045785

View attachment 1045793

View attachment 1045801

Hope these pics worked. After the flash update was done it fixed the transmission acting as though it was slipping out of gear like the clutch was pressed( I know it doesn't have a clutch). It also fixed the problem of the it coming to a stop and either stalling completely dead or the rpm surging up and down and the stabilizing. When I mentioned the TSB about the transmission not needing flushing the mechanic quickly changed his story to " it only needed a quart or two" which was filled for free ( I like free). With the problem fixed FOR NOW I will continue monitor to see if the problem returns. Hope this helps anybody with the same problems as I have seen on here but have found no solution to ( I may not have searched long enough). Thanks for everyone's help. There was also mentioned that a 3900 rpm limit was erased. I never remembered it having one as I have driven it past that before and since the flash update. Has anyone else had this rev limit?
And I just noticed I never gave any info on my jeep
05 wk
Hemi
QDII

I remember there being a TSB about the rev limiter too. When the transmission goes into limp mode , it sometimes will set a 3900 rpm rev limiter condition on the engine . I think there was a TSB to remove that because the PCM will already throttle ot torque limit the enging on transmission going into limp mode .
Actually 05 limited w/5.7 is in your first post so no worries . That would have been the first question if it wasn't there . I still say that garage is a little shady , but as long as your problem is fixed for now and your happy, that's all that matters .
Good luck

 

Also I did already have the N23 recall done before I found out about the 4 lo problem. I will continue to monitor it and make sure it works. Thanks again

 

my dealer is saying the same thing as thunder's Says they cannot find the problem and that the hemi trans never has issues. Telling me that the electronic shift module is only on the 6 cylinder modes.

I'm giving them till noon today, if they don't have any results I'm pulling it out of there.

Talked to my buddy last night who has an 06 like mine, says his does the same thing everynow and then. CEL and stuck in 3rd.

He says is just goes away on its own.

 

Darot we can both be sure that the hemi tranny has issues. All 05 grand Cherokees have electronic shift modules. It doesn't matter what the motor is. Not sure what they're trying to get out of by lying about that though. That's beyond my jeep knowledge. Sorry I couldn't help more.

 

my dealer is saying the same thing as thunder's Says they cannot find the problem and that the hemi trans never has issues. Telling me that the electronic shift module is only on the 6 cylinder modes. I'm giving them till noon today, if they don't have any results I'm pulling it out of there. Talked to my buddy last night who has an 06 like mine, says his does the same thing everynow and then. CEL and stuck in 3rd. He says is just goes away on its own.

I only wish the 545RFE transmission never had issues. My pocket would not be $800 light. The issues isn't the shift module with the transmissions in the HEMI, but rather the solenoid pack and in my case the valve body. Here is my proof they have problems.

 

Damn. That hurts. After my flash update it has driven good so far. I need to drive it some more after work and see if it gives me any more trouble. I don't have my hopes up yet though. Thanks for the info and I hope mine doesn't come to that. Is it driving good now. Thanks

 

I think the 800 bucks is where I'm headed. Just got off the phone with the dealer and they are making excuses that the PCM/TCM download has 2 pages of errors and they are still sorting through them (the DTC report only showed the P0700). He rattled off a few dealing with low pressures so I'll be shocked if they don't come back with the solenoid replacement.

I will post their recommendations

 

Well so far the idle/stalling issue has been resolved but I wish I could say the same for the transmission problem. It is still slipping as though the clutch is being engaged. I want to go back to the dealer and hand out a few open hand high fives to the mechanics face. But who hasn't wanted to do that. It's obvious that no one trusts a stealership but I just hoped the PCM flash update would work. But I'm turning this into a rant and I apologize. Where should I go next? In/out speed sensors? More diagnostics? I hope to find the problem before replacing something like the valve body. That's way beyond my knowledge and the price tag scares me. Thanks for any help.

 

back on the original issue.... dealer is changing the fluid and filters and a pressure solenoid (not the trans solenoid). This solenoid is supposed to be external, I'll find out this afternoon what it is. They are telling me that the issue with diagnosing the problem is that the computer will register a fault but will not record any data detailing the fault. That said they are telling me my PCM is fine. They think the trans solenoid is not the issue. more to come...

 

dealer now replacing the PCM. I had it replaced about 3 months ago with a mopar rebuilt unit due to throttle body issues (a local shop did it), they think that is the source of my issues. Supposed to be ready Tuesday.

 

Any luck?