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I believe it's related to the Start/Stop function.
Maybe just added cranking amperage. Just odd I haven't seen any mention of it. Thanks.
I believe the smaller one is a backup to allow the transmission to be put in neutral just in case the main 12v dies.
I’ll keep an eye on mine for the next few days and let you know what it’s doing.
It's to run the pump that cools the turbos after you shut the truck off
Its the aux battery that handles stop/start functions. Entirely common on most Stellanis models (Ram, Jeep, etc.) since about 2018. A few models don't have them, such as vehicles with eTorque (48v generator) found in some 3.6 and 5.7 setups.
I timed it on my truck, it took 1 minute for the idle to come down after starting it up from inside the truck. But, I did notice a short stumble while it was idling high. Happened only once but was probably a misfire. I won't be surprised if I get a CEL at some point. (My truck was built in August)
Yeah I timed this rental they gave me and it's about 45-50 seconds of high idling as well. It's doing the same stumble/misfire as my truck did, but it still hasn't given me a CEL. I should be getting my truck back soon hopefully. There is a TSB about a new software for the trucks that have the CEL.
Hopefully the update takes care of it. I'm not too concerned about it long term since I believe they will eventually get it figured out. But all the trucks that have gotten a check engine light so far, definitely feels like it's most likely related to the high idling at start up imo. I was hoping my truck, with an August build, that they would have had it ironed out already, but doesn't sound like it.
This would explain why start stop seems so seamless in my 25 1500 where as in my 2017 jeep it seemed like it took forever from shut down to start up again.
Keep us posted. I am pretty sure that this will happen to my truck also at some point. I'm not impressed with the high revving cold start and then a quick stumble at about the 20 seconds in mark. But other than the cold starts, the motor is super smooth and runs great.
Right about when mine happened. Do the dealerships have the software yet? I was waiting for a call, they said hopefully in a few weeks (that was 2 weeks ago)
I think it's on both. I notice a quick stumble in the motor at about the 20 second mark after a cold start. I need to time it to know exactly, but it seems to happen at roughly the same time every time. This is with remote start and also normal push button start from inside the truck. If you get or have a CEL while using the remote start, it will turn your tuck off.
