Auto stop/start a dangerous nightmare!

[GraniteJT]

I have a similar situation with the auto stop/start except mine is much worse. I have a 2020 max tow and it started about 8 months ago. I took it to two places and they can't find anything wrong with it. What I was told was when they scan the jeep to get the code it doesn't have a memory and can't tell them what is wrong or went wrong. Brilliant engineering! They reset the system and updated software but the crap happens on the same day. The two Batteries all checked out to be ok. SOOOO... this is my problem thats worse then a simple auto/stop start light that goes on. When I forget to push the button I'll be driving for a few minutes and say at a red light it turns off and I release the brake with my foot and it will not start. So I have to put the car in Park and press the start button and start the car myself. Ha! I also found out that when I'm in drive at a stop and the engine cuts off... I can move the shifter from drive through neutral past reverse and then in Park and it starts by itself! Ha, Ha, Its fun when people are beeping at you at a red light and this BS happens. Well it gets worse! Sometimes when I forget to press the auto/stop button when I first get in to deactivate it and then start to drive slowly away the transmission locks up and comes to a hard jerk and goes into a blinking park on my manual shifter and I'm pressing the gas and its just revving. Very dangerous! This has happened to me backing out of a parking spot in oncoming traffic. I was backing out doing about 2 mph and it locks up and jerks to a halt and goes into park. So I push the push the start button and turn it off and then turn it back on again. Please someone help... Dealers are useless just so you all know I have a 2.5 in lift with 35's and has never been modified or beatdown off-road. Is this a lemon?

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[IamPro2A]

Well, you could use a Tazer or start/stop eliminator to keep it shut off so you don't have to remember. But it sounds like you have other issues. The automatically going into park is something that happens if it thinks your door is open and you are not wearing your seatbelt. The fact it doesn't always happen probably rules out a bent pin in the door plug or something like that. Seems like multiple sensors (door open/closed, seatbelt on/off, gas pedal depressed y/n) are all acting erratically.

 

[DAVECS1]

Your throttlebody is loosing position os my bet, and when that happens the system requires park and key off reset.

I just had a conversation with SteveOrlando about this. There is a thread about throttle bodies making noise. I rhink ot is more than that. i have tuned a large number of these trucks now and they all have varying degrees of weird throttlebody behavior. I started logging a bunch of parameters on my truck for this, and it is surprising how often ot looses position, especially if you let it do a start stop. Just having the engine on all the time. If you do a WOT to coast and back on the throttle, it gets really confused. And then the transmission holds the gear it is in until it all settles out. Uggh the 3.6L is not making me happy?

 

[GraniteJT]

Yes, there are other issues with the electronics that I didn't mention but what you said kind of made me think that it can be linked. A few things are that the driver side door when open doesn't display the little icon of the door ajar and the light will not go on. (sometimes not all the time) This is probably not relate but passenger heated mirror doesn't heat up. To your point I thought it might be a bent pin. I also took it to the dealer awhile ago because of other issues such as when I hit the heated mirror button it would turn off something else I had on. I think the tazer is on my list of things to purchase. Thanks

 

[DAVECS1]

Sounds like an issue with your BCM. I think your dealer needs to do a comete reflash and then service tool diagnostic of your controllers. It is like the BCM is setup for another model or something

 

[GraniteJT]

Interesting, I will have to research this but from first glance of a google search it may be related or the cause. Thanks

 

[MattK]

Your description makes it sounds like it's not a stop/start issue but something in the auto transmission is not detecting what position it's in. Just a wild guess based on your description.

 

[dcmdon]

It blows my mind how fragile the electronics are on this vehicle. Something like a bent pin on a door electrical connector can disable the whole freaking vehicle.

The software logic is just insanely stupid. When I say fragile I'm not talking about physical fragility of a part or sensor. But rather the inability of the software to manage a failure.

To the OP, Others know much much more than I do, but I believe that if you own something like AlphaOBD and a OBD dongle, you can record logs while you are driving.

This could reveal errors that never actually throw a code.

 

[NachoRuby]

It seems like something else. Not auto start stop. That should not throw you into park. And then you say it doesn't always recognize when the door is open? Seems like a bent pin could cause both of these issues. I'd first try disconnecting the door harness and seeing if It resolves this issue (although your door won't lock and the window won't work). If it does, you know what the problem is. If it doesn't, I'd move on to the bigger things, like Dave said with the BCM, because he know his stuff.

 

[ShadowsPapa]

It seems like something else. Not auto start stop. That should not throw you into park. And then you say it doesn't always recognize when the door is open? Seems like a bent pin could cause both of these issues. I'd first try disconnecting the door harness and seeing if It resolves this issue (although your door won't lock and the window won't work). If it does, you know what the problem is. If it doesn't, I'd move on to the bigger things, like Dave said with the BCM, because he know his stuff.

Yup - it's not the ass/ess, there's a bigger or other problem with it.

I'd wonder - what's been done, is the thing all stock, have the doors ever been off, and other related questions....

 

[GraniteJT]

Yes all stock. This all started to happen the first time I took the doors off. It was all down hill from there.

 

[NachoRuby]

Yes all stock. This all started to happen the first time I took the doors off. It was all down hill from there.

Then it's almost definitely bent pins.

 

[GraniteJT]

It seems like something else. Not auto start stop. That should not throw you into park. And then you say it doesn't always recognize when the door is open? Seems like a bent pin could cause both of these issues. I'd first try disconnecting the door harness and seeing if It resolves this issue (although your door won't lock and the window won't work). If it does, you know what the problem is. If it doesn't, I'd move on to the bigger things, like Dave said with the BCM, because he know his stuff.

 

[GraniteJT]

Makes sense let me try that first.

 

[ShadowsPapa]

Yeah, it's thinking there's a door open, among other things.............

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