08 Commander 4.7 (187,000 miles)need tranny help - Page 4 - JeepForum.com
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post #46 of 57 Old 11-13-2019, 09:14 PM Thread Starter
artisticchic24
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Do you think the dead battery had anything to do with what’s going on?

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post #47 of 57 Old 11-14-2019, 08:39 AM
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I doubt it.. But dying batteries can do strange things in these, so I wouldn’t discount it completely. Lol

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post #48 of 57 Old 11-14-2019, 06:28 PM
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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.

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post #49 of 57 Old 11-14-2019, 10:46 PM Thread Starter
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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?
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post #50 of 57 Old 11-14-2019, 11:01 PM
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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.

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post #51 of 57 Old 11-15-2019, 06:45 AM Thread Starter
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The fluid is the color it’s suppose to be, I didn’t mean to freak you out by saying pink!
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post #52 of 57 Old 11-15-2019, 07:31 AM Thread Starter
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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?
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post #53 of 57 Old 11-15-2019, 08:10 AM Thread Starter
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The fluid is as it should be...no burnt smell and the correct color
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post #54 of 57 Old 11-15-2019, 08:35 AM
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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 .

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post #55 of 57 Old 11-15-2019, 06:39 PM Thread Starter
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Going to check all this things out and let y’all know the results🤞🏻 thanks again Guys!!!
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post #56 of 57 Old 11-24-2019, 05:49 PM Thread Starter
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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😊
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post #57 of 57 Old 11-24-2019, 10:32 PM
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Ah... the ol coffee spilled on the shifter

Glad you found it!
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