Electrical issues but where to begin?

[MarkBrown125]

2021 ram 1500 rebel, hemi 5.7, 104k miles

1. Truck wont start unless positive battery terminal pulled for 20-30mins.
2. Shortly after it starts, I get the following:
-Service Electronic stability control
-Service trailer braking system
-Service 4wd (this one is intermediate)
-Service shifter (comes on then off)
-Service tire pressure sensing system (tire readings come and go while it's running)
-The little green "run" light above the push start button blinks erratically.

Besides all that the truck runs great! Noticed my backup camera doesn't function in reverse now tho.

Once I shut the truck off, it will not restart. Foot on brake, pushing the start button with the key fob. Nothing. The little "OFF" light above the push button blinking erratically. Unless I reset it with the battery terminal pull. Another thing to note is that I do have issues with water intrusion into the cabin via the upper brake light. Also, the battery was replaced about 2 months ago. Any input or suggestions are highly appreciated.

 

[RamDiver]

2021 ram 1500 rebel, hemi 5.7, 104k miles

1. Truck wont start unless positive battery terminal pulled for 20-30mins.
2. Shortly after it starts, I get the following:
-Service Electronic stability control
-Service trailer braking system
-Service 4wd (this one is intermediate)
-Service shifter (comes on then off)
-Service tire pressure sensing system (tire readings come and go while it's running)
-The little green "run" light above the push start button blinks erratically.

Besides all that the truck runs great! Noticed my backup camera doesn't function in reverse now tho.

Once I shut the truck off, it will not restart. Foot on brake, pushing the start button with the key fob. Nothing. The little "OFF" light above the push button blinking erratically. Unless I reset it with the battery terminal pull. Another thing to note is that I do have issues with water intrusion into the cabin via the upper brake light. Also, the battery was replaced about 2 months ago. Any input or suggestions are highly appreciated.

Get it running and scan for codes, or...

Check the carpet for moisture in the back seat floor area, under the sliding window/third brake light.
Check the back wall for wetness. You will likely have to pull the back seats out to check the back wall. Check YouTube for seat removal directions.

Expose the RF Hub on the back wall of the cab and inspect for water intrusion.
Sometimes a module will flood the CAN Bus with garbage data, creating a condition known as a DTC storm.

This condition will cause the features that you're describing.
I bet the cruise control and remote start don't function either.







And, to Ram Forum.

.

 

[TimboRam77]

Try another new battery. Batteries are voo doo nowadays along with vehicles needing perfect amps for all the Hal 9000 components. Every new battery I purchase is always under charged so fully charge new before install. Some new Batteries are defective in subtle ways but test good. Unfortunately we are living in a everything is crap world, the newer the more likely to be bad. Auto zone has always been my go to for Batteries but no longer. Their testing equipment just isn't right. Costco now has the best Batteries for the best price, imo and at my local store.

 

[70runner]

Previous 21 Rebel was afflicted with electrical gremlins such as you describe, plus a parasitic drain about 4-5 times spec. Dealer couldn't find cause of parasitic drain. Dumped OE battery for an H7 from wallymart, then put the truck on a trickle charger. End of electrical gremlins. My experience suggests these computerized trucks are susceptible to minor variations in battery voltage, which can be aggravated by parasitic drain. Current 25 has been on trickle charger since purchased, so far free of electrical gremlins.

 

[RamDiver]

2021 ram 1500 rebel, hemi 5.7, 104k miles

1. Truck wont start unless positive battery terminal pulled for 20-30mins.
2. Shortly after it starts, I get the following:
-Service Electronic stability control
-Service trailer braking system
-Service 4wd (this one is intermediate)
-Service shifter (comes on then off)
-Service tire pressure sensing system (tire readings come and go while it's running)
-The little green "run" light above the push start button blinks erratically.

Besides all that the truck runs great! Noticed my backup camera doesn't function in reverse now tho.

Once I shut the truck off, it will not restart. Foot on brake, pushing the start button with the key fob. Nothing. The little "OFF" light above the push button blinking erratically. Unless I reset it with the battery terminal pull. Another thing to note is that I do have issues with water intrusion into the cabin via the upper brake light. Also, the battery was replaced about 2 months ago. Any input or suggestions are highly appreciated.

Are there any updates or new information yet?

.

 

[Hagar1]

Previous 21 Rebel was afflicted with electrical gremlins such as you describe, plus a parasitic drain about 4-5 times spec. Dealer couldn't find cause of parasitic drain. Dumped OE battery for an H7 from wallymart, then put the truck on a trickle charger. End of electrical gremlins. My experience suggests these computerized trucks are susceptible to minor variations in battery voltage, which can be aggravated by parasitic drain. Current 25 has been on trickle charger since purchased, so far free of electrical gremlins.

Ahhh, Walmart batteries, my goto when I need a battery. Their batteries are made by a name brand big manufacturer. I've had excellent service from their batteries.

 

[Drfromnc]

My Walmart battery (11 month old) cost me about $500 from the dealership service department and they still didn’t find the issue. Took it in for DTC “firestorm” until they got feed up with it. Told me to come get because my high mileage (134xxx) was not worth time/money. Went to pickup the truck from them and battery was dead wouldn’t charge. Took battery back to Walmart for warranty replacement to find out from their service manager they’ve had a lot of battery problems with new supplier. BUT new battery fixed all my weird DTC issue.

 

[Grams]

2021 ram 1500 rebel, hemi 5.7, 104k miles

1. Truck wont start unless positive battery terminal pulled for 20-30mins.
2. Shortly after it starts, I get the following:
-Service Electronic stability control
-Service trailer braking system
-Service 4wd (this one is intermediate)
-Service shifter (comes on then off)
-Service tire pressure sensing system (tire readings come and go while it's running)
-The little green "run" light above the push start button blinks erratically.

Besides all that the truck runs great! Noticed my backup camera doesn't function in reverse now tho.

Once I shut the truck off, it will not restart. Foot on brake, pushing the start button with the key fob. Nothing. The little "OFF" light above the push button blinking erratically. Unless I reset it with the battery terminal pull. Another thing to note is that I do have issues with water intrusion into the cabin via the upper brake light. Also, the battery was replaced about 2 months ago. Any input or suggestions are highly appreciated.

Take it to the nearest Ram Dealer and hand them the key-fob and your credit-card.

They will locate the poor ground connections and remove your grandchildrens college-funds.

 

[markabby]

typical one post wonder.....rarely, if ever, do we see a reply saying if the problem was resolved or not.

 

[RamDiver]

Take it to the nearest Ram Dealer and hand them the key-fob and your credit-card.

They will locate the poor ground connections and remove your grandchildrens college-funds.

.

 

[jawzs2]

typical one post wonder.....rarely, if ever, do we see a reply saying if the problem was resolved or not.

I'm always perplexed as to how in the world a thread like this gets resurrected two months later - LOL

 

[markabby]

I'm always perplexed as to how in the world a thread like this gets resurrected two months later - LOL

lol....i never looked at the original date.

 

[turkeybird56]

Electrical Gremlins in the Forum??? lol...

 

[RamDiver]

Electrical Gremlins in the Forum??? lol...

More like electrical gremlins in some people's brains.

I slipped up yesterday and wrote an entire page before realizing it was an ancient thread, resurrected by a newbie.

.

 

[turkeybird56]

More like electrical gremlins in some people's brains.

I slipped up yesterday and wrote an entire page before realizing it was an ancient thread, resurrected by a newbie.

.

YEAH, my RGB feature control on my PC has quit working, just defaulted to one color, and no goofing with it helps, lol. And that is just in a PC.
I cannot even imagine chasing an electrical gremlin on a 2025 and newer RAM with the new electrical architecture.

 

[jawzs2]

More like electrical gremlins in some people's brains.

I slipped up yesterday and wrote an entire page before realizing it was an ancient thread, resurrected by a newbie.

.

Been there, done that, and still have the t-shirt - LOL

 

[RamDiver]

Been there, done that, and still have the t-shirt - LOL

I would likely be lying if I said this was the first time, but you likely know that story.

.