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Thread: 08 Commander 4.7 (187,000 miles)need tranny help Reply to Thread
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  Topic Review (Newest First)
11-24-2019 10:32 PM
2005JGC Ah... the ol coffee spilled on the shifter

Glad you found it!
11-24-2019 05:49 PM
artisticchic24 Pretty sure it’s fixed. Took the shifter apart and cleaned the circuit boards. While he was in there he cleaned the main plug for the shifter assembly. It was super corroded. He drove it around for awhile, it did not go into first gear and the slap shifter goes in every gear. He’s going to come back over with some diamond tipped tweezers and clean it better before he puts it completely back together. Thank you everyone that gave pointers and advise... greatly appreciate it😊
11-15-2019 06:39 PM
artisticchic24 Going to check all this things out and let y’all know the results🤞🏻 thanks again Guys!!!
11-15-2019 08:35 AM
yzjwk
Quote:
Originally Posted by artisticchic24 View Post
I’m not sure what else to do but throw parts at...is there a part that I should start with? Is there anything else I can do to find the problem that we have not done?
As much as I hate to say it and similar to what 2005JGC said, without getting hands on, your pretty much at dealer level or at least "decent garage" diagnostics with this one.
If you can’t pull any codes after the fact and or complete a drive along with the bidirectional scanner to see where the shift signal is coming from I think the professional diagnostics would be worth the price of frustration (and guessed parts).

I personally think you will be looking at a PCM here but it's an expensive guess that requires programming anyways and it could just as easily be a partially severed wire or missed bad connector.

Did you look at the transmission control relay ( swap it with another one in there ) and connector on the transmission?

I think that’s where the transmission range sensor gets its power from. This is the part on the transmission that tells the TCM what gear it’s in and the connector is susceptible to trans fluid and gunk getting into it .
11-15-2019 08:10 AM
artisticchic24 The fluid is as it should be...no burnt smell and the correct color
11-15-2019 07:31 AM
artisticchic24 I’m not sure what else to do but throw parts at...is there a part that I should start with? Is there anything else I can do to find the problem that we have not done?
11-15-2019 06:45 AM
artisticchic24 The fluid is the color it’s suppose to be, I didn’t mean to freak you out by saying pink!
11-14-2019 11:01 PM
2005JGC It shouldn't be pink. It should be a dark red! If its actually pink, you have water in the fluid.

The shifter cleaning stuff is mostly for the NAG transmission. There is a lot more that goes on in the shifter for the NAG1 transmission. The 545RFE shifter is not a common failure. At the same time with a transmission that randomly wants to downshift to first as speed allows, it seems like its being commanded (like the shifter is telling it). At this point, this does not appear to be a common problem. The "pink" fluid scares me. IIRC there was a service procedure on some of these that had dealer techs install a shield that protected the dipstick tube seal because the HVAC drained right over it and it was getting into the transmission through the seal... something like that. Ill have to look for it. Cannot remember if it was a recall, RRT or just a Tech Bulletin (some of those I dont have access to look up anymore).

Amen about the kids. Took my oldest (7yr old) out wheeling on Saturday and grabbed some milkshakes with dinner on our way back into town. We ate in the resturant, because kids, but he had milkshake left that I let him take home. 2 days later I was loading my daughter up into the jeep and saw that he spilled his milkshake all over the back seat and down the back side... This kid is killing me.

EDIT: I did some searching, I am not seeing the information, but I did see a 2005 5.7l WK on another forum that identified the cause of the pink trans fluid was exactly what I remembered, water getting into the trans through the dipstick seal.
11-14-2019 10:46 PM
artisticchic24 I don’t recall spelling anything on it but I’m sure stuff has been spilled... kids! At this point, I don’t know what to do except throw parts at it. Would the shifter be a good place to start? I know I’ve read a lot about taking it apart and cleaning it... should I go that route or just suck it up and buy a new one... there are pricey.
As far as the fluid, it’s at the right level and it’s pink like it should be. I have not smelled it... I will tomorrow and post it.
Is there a way to tell if it’s electrical or the actual transmission?
11-14-2019 06:28 PM
2005JGC I would want to see what the commanded shift is. Have you ever spilled any coffee on the center console/shifter? Based on the description of what is happening, it sounds like it is NOT downshifting to 1st on the freeway (like one of my previous posts, it wont let you do dumb things that will kill it, but it does seem to shifting down to first when speed allows it. Makes me wonder if the autoshift function is asking it to downshift from an internal fault. If it is a commanded downshift by the shifter, there wouldn't be a DTC and if it was stuck on a downshift request it could potentially present the symptom you are describing. Although, I would imagine that if it was stuck on there would likely be a code saying it was stuck in one position. This is really hard to get too far without my hands on it really. There is some major information missing here that you have been unsuccessful retrieving at this point.

Like yzjwk said, I doubt its the battery. Modern Chryslers are battery and voltage picky but HIGHLY doubtful it would present in this one symptom.

What is the transmission fluid level? What does the fluid smell like? You will know if it is burnt, its a very obvious smell.
11-14-2019 08:39 AM
yzjwk I doubt it.. But dying batteries can do strange things in these, so I wouldn’t discount it completely. Lol
11-13-2019 09:14 PM
artisticchic24 Do you think the dead battery had anything to do with what’s going on?
11-13-2019 07:10 PM
yzjwk
Quote:
Originally Posted by artisticchic24 View Post
First off thank you guys for trying to help my sister with this issue, we really appreciate all your thoughts and input!
Also I am not a mechanic, I am a Bodyshop guy that does his on mechanical work, mostly suspension work so this is a little out of my wheel house!
So today I went back over, inspected the PCM terminals, all looked good and clean, replaced the battery, grounded the positive cable while it was disconnected,did the reset with the gas pedal. Drove it out of her neighborhood for less than 5 minutes before the display changed from D to 1. When this happened it automatically downshift into what I am pretty sure was 2nd gear. As I continued to slow down it downshifted into 1st. I continued driving and it would not shift out of 1st. Was doing 20mph at 3000rpm’s.
Made it back to the house, plugged the scanner in and selected read all DTC’s.
After the scan completed it only had some TPMS codes 0 engine and the transmission showed not scanned again. I found the area to reset the trans so I did that, I placed it in drive and it changed to 1st almost immediately. So then I reset the ECM but had the same results. I fumbled my way through several other tests but really wasn’t sure what any of the data was telling me. Nothing jumped out as odd though. All this being said, if any of you have more knowledge on what tests to run and what indicators to look for in the data I would greatly appreciate it! Thanks again for your time guys!
Sounds like the CAN bus is communicating if all the other modules are showing, so that’s good.
If you turn the jeep off and back to on without starting, or reset with the battery disconnect to where it is initially driveable , can you then read the TCM with the scanner?

Another thing to check although I don’t think it’s related is the 20 pin connector coming off the transmission and the transmission control relay in the power distribution center under the hood.

I think the TCM is loosing power during the drive but according to the service manual, it should retain the one battery lost code...
11-13-2019 06:20 PM
artisticchic24 First off thank you guys for trying to help my sister with this issue, we really appreciate all your thoughts and input!
Also I am not a mechanic, I am a Bodyshop guy that does his on mechanical work, mostly suspension work so this is a little out of my wheel house!
So today I went back over, inspected the PCM terminals, all looked good and clean, replaced the battery, grounded the positive cable while it was disconnected,did the reset with the gas pedal. Drove it out of her neighborhood for less than 5 minutes before the display changed from D to 1. When this happened it automatically downshift into what I am pretty sure was 2nd gear. As I continued to slow down it downshifted into 1st. I continued driving and it would not shift out of 1st. Was doing 20mph at 3000rpm’s.
Made it back to the house, plugged the scanner in and selected read all DTC’s.
After the scan completed it only had some TPMS codes 0 engine and the transmission showed not scanned again. I found the area to reset the trans so I did that, I placed it in drive and it changed to 1st almost immediately. So then I reset the ECM but had the same results. I fumbled my way through several other tests but really wasn’t sure what any of the data was telling me. Nothing jumped out as odd though. All this being said, if any of you have more knowledge on what tests to run and what indicators to look for in the data I would greatly appreciate it! Thanks again for your time guys!
11-13-2019 05:41 PM
artisticchic24 I wish I could post pictures he sent me of the scanner screen. Anyway there was a option to test the electronic shifter... it gave a error- unable to complete task...on the shifter. Could the shifter cause this all to happen? I know it has. a circuit board down there
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