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  #1  
Old 07-11-2015, 03:20 AM
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05' JGC WK Stuck in 3rd Gear!

Hey guys,

I am resorting to here after my research because what I found points me into a somewhat expensive and laborious direction. I'd just rather be sure of what is wrong before I go and drop my trans pan and replace the solenoid pack.

To begin, I recently changed my trans fluid and both filters with Royal Purple ATF and Mopar filters not even 2K miles ago. I checked the fluid just now and all seems fine when hot. I didn't check it as cold yet, just did it when I got home.

I was driving home from work with no previous signs of concern or trouble. Accelerating to around 45MPH, I heard and saw my check engine light go on, but didn't think much of it. That was until I noticed that my Jeep would not shift up or down and the dash read '3' on the shifting selection area. It was just stuck in third, I was in limp mode and underneath me I heard a light squealing, but later found that it was just my wallet crying in anticipation.

I got home and ran the Superchips scanner and found codes P0700 which is basically a MIL Request and P2706 MS Solenoid Circuit. Research has shown that it's probably the solenoid pack above the valve body, above the expensive trans fluid.

Before I go under my Jeep and look for anything suspicous, is there anything else I should check? Oh, and it's the 545RFE alongside the Hemi.

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  #2  
Old 07-11-2015, 06:24 AM
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Re: 05' JGC WK Stuck in 3rd Gear!

The MS solenoid (Multi Select) is one of the most used solenoids of the solenoid pack. It is activated in 1st, 2nd, and 5th and sometimes in reverse (above 8mph). All the solenoids are tested by the TCM at power-up and every 10 seconds thereafter. If no continuity is measured for 3 consecutive times, the fault code is set and the transmission goes into limp mode.
I would check the wire bundle which goes to the transmission solenoid pack as far as possible for chaving and remove the connector from the solenoid pack and check for moisture/corrosion on the pins. You can check the MS solenoid wire for continuity towards the TCM (PCM) and short to ground. If all that is ok, most probably the solenoid is bad.
Attached a wiring schematic with the connector pin numbers in case you want to measure the wire.
Attached Files
File Type: pdf TRS-solenoid.pdf (130.9 KB, 3 views)
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Old 07-11-2015, 11:31 AM
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Re: 05' JGC WK Stuck in 3rd Gear!

Quote:
Originally Posted by Frango100 View Post
The MS solenoid (Multi Select) is one of the most used solenoids of the solenoid pack. It is activated in 1st, 2nd, and 5th and sometimes in reverse (above 8mph). All the solenoids are tested by the TCM at power-up and every 10 seconds thereafter. If no continuity is measured for 3 consecutive times, the fault code is set and the transmission goes into limp mode.
I would check the wire bundle which goes to the transmission solenoid pack as far as possible for chaving and remove the connector from the solenoid pack and check for moisture/corrosion on the pins. You can check the MS solenoid wire for continuity towards the TCM (PCM) and short to ground. If all that is ok, most probably the solenoid is bad.
Attached a wiring schematic with the connector pin numbers in case you want to measure the wire.
I will definitely do this, this is the best advice I have heard in all my searching. I greatly appreciate you taking your time to write this as it's my only chance to save $600 or so. Thanks again!
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Old 07-11-2015, 12:02 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

When it becomes necessary, then the TRS/solenoid block can be bought for around $260 with the seal plate. You find them on e-bay, but i bought mine overhere: Automotive Transmission Electronics Specialists
No rocket sience to change the pack, however you need to be carefull when re-installing the valve body. There is a pin in the transmission which should enter into the shift fork on the valve body. When you can install the valve body flush into the transmission, it should be ok, but dont tighten the bolts when you cant get it flush. The result can be a broken pin and the transmission must be lowered and opened to change the shift pin and lever.
If you clean the tranny pan well before opening and catch the new fluid in a tray, you can re-use it again. Best is however to filter it, to prevent any small dirt particle to enter the transmission. Transmission work is not that difficult, but cleanliness is a must.
If you need to get the valve body out, you could think about installing a shift kit as well. Transgo has one for the 5-45 RFE.
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Old 07-11-2015, 12:27 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Quote:
Originally Posted by Frango100 View Post
When it becomes necessary, then the TRS/solenoid block can be bought for around $260 with the seal plate. You find them on e-bay, but i bought mine overhere: Automotive Transmission Electronics Specialists
No rocket sience to change the pack, however you need to be carefull when re-installing the valve body. There is a pin in the transmission which should enter into the shift fork on the valve body. When you can install the valve body flush into the transmission, it should be ok, but dont tighten the bolts when you cant get it flush. The result can be a broken pin and the transmission must be lowered and opened to change the shift pin and lever.
If you clean the tranny pan well before opening and catch the new fluid in a tray, you can re-use it again. Best is however to filter it, to prevent any small dirt particle to enter the transmission. Transmission work is not that difficult, but cleanliness is a must.
If you need to get the valve body out, you could think about installing a shift kit as well. Transgo has one for the 5-45 RFE.
I wish you could have seen my face while reading that. I'm answering you on my phone, but I'm also on my computer, ordering the Transgo Shift Kit. No joke, haha! Great minds think alike, I'm just glad you have a mind with more transmission knowledge! I'll get back after I do a few inspections and after I drop the pan. I may get a better magnet in there too.
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Old 07-11-2015, 01:04 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

The transgo kit comes with some parts which can only be put in with the transmission on the bench and opened up. Some valves / springs for the pump and a a heavier duty c clip for one of the clutch packs, but many install only the valve body components and line pressure resistor. I installed all, since i had my transmission open for a rebuild, but you can skip the internal stuff without a problem. The kit will firm up the shifts, reduce clutch wear and reduce transmission fluid temperatures.
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Old 07-11-2015, 01:10 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Quote:
Originally Posted by Frango100 View Post
The transgo kit comes with some parts which can only be put in with the transmission on the bench and opened up. Some valves / springs for the pump and a a heavier duty c clip for one of the clutch packs, but many install only the valve body components and line pressure resistor. I installed all, since i had my transmission open for a rebuild, but you can skip the internal stuff without a problem. The kit will firm up the shifts, reduce clutch wear and reduce transmission fluid temperatures.
I read on their website that the resistor should not be installed in 05' and up vehicles along with vehicles that have a tune, or tuner, that boosts hydraulic pressure. What is it about an 05'+ that would cause them to say that?
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Old 07-11-2015, 07:05 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Not sure about that, maybe that the 05 and up already uses a higher line pressure. I will see what i can find on this. Ofcourse if you have a tuner and already increased the line pressure via the tuner, you dont want to increase the line pressure any further, or you will blow out seals.
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Old 07-12-2015, 03:59 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Quote:
Originally Posted by Frango100 View Post
Not sure about that, maybe that the 05 and up already uses a higher line pressure. I will see what i can find on this. Ofcourse if you have a tuner and already increased the line pressure via the tuner, you dont want to increase the line pressure any further, or you will blow out seals.
Yeah, that makes sense. I'd just rather it boost the line pressure manually rather than electrically. I do have a tuner, but would not adjust the line pressure with it if so! Thanks again for all of your help, you're truly awesome!
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Old 07-12-2015, 06:27 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

There is no way to control the line pressure manually, since the system uses a pressure regulating solenoid (one of the 6 solenoids in the pack) and it uses the line pressure sensor (on the right hand outside of the transmission casing) as a feedback, so its a closed loop system. The resistor is normally soldered in between two wires close to the line pressure sensor, and it is only fooling the TCM with a lower then actual line pressure feedback signal, so that the TCM will increase the line pressure.
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Old 07-12-2015, 10:30 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Just compared the line pressure used in the 99-04 WJ and the 05-10 WK (all with the 5-45RFE). For the 4.7L WK, the line pressures are the same as used in the WJ. The WK with the 5.7L uses a bit higher line pressure, due to the higher torque and the need for more holding power for the clutches (160 PSI compared to 120 PSI). So maybe that is the reason that the resistor should not be used on the WK 5.7L (however, i donīt see a reason why it could not be used on the 4.7L)
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Old 07-12-2015, 11:12 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Quote:
Originally Posted by Frango100 View Post
Just compared the line pressure used in the 99-04 WJ and the 05-10 WK (all with the 5-45RFE). For the 4.7L WK, the line pressures are the same as used in the WJ. The WK with the 5.7L uses a bit higher line pressure, due to the higher torque and the need for more holding power for the clutches (160 PSI compared to 120 PSI). So maybe that is the reason that the resistor should not be used on the WK 5.7L (however, i donīt see a reason why it could not be used on the 4.7L)
Hmm, well I'll just skip it completely! I am ordering the last of what I needed, I'll keep it posted. Thanks again, I would probably still be looking things up without you!
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