2025 Ram sst ho

[agio]

New to the forum, hope this goes well. Intermittently, while stopped at a light, the truck revs erratically, the puts itself in Park, and applies the emergency brake. Brought it to the dealership 3 times, last trip the said they couldn't find the problem. I get no check engine or other error. Anyone help out, thanks.

 

[Mpgrimm2]

Be careful, there have been a few trucks with reported sudden acceleration.

 

[RamDiver]

New to the forum, hope this goes well. Intermittently, while stopped at a light, the truck revs erratically, the puts itself in Park, and applies the emergency brake. Brought it to the dealership 3 times, last trip the said they couldn't find the problem. I get no check engine or other error. Anyone help out, thanks.

Welcome to Ram Forum.


The search utility in the upper-right will find numerous threads discussing various failures in 2025 & 2026 model trucks. Both of these years share the I6 dual turbo and the newer Atlantis High electrical architecture.

The following article has identified ground faults and a 12-volt power system that is unable to regulate the voltage sufficiently with the turbo system. This lack of regulation creates problems for the computer modules, resulting in a myriad of problems.

The issues vary from minor inconveniences to sudden explosive runaway accelerations, as mentioned above by Mpgrimm2.


Key Takeaways

• Identify structural voltage drops rather than accept simple software-glitch explanations from factory service centers.
• Inspect and clean factory grounding blocks down to bare metal to eliminate high-resistance points.
• Monitor dashboard behaviour during high-load scenarios, such as trailer towing or high-altitude mountain ascents.
• Upgrade to a premium battery to provide a stronger electrical buffer against high-amperage powertrain components.

Why The Ram 1500 Hurricane Engine Electrical Demands Are Causing Total Instrument Cluster Blackouts

Electrical demands from the Ram 1500 Hurricane engine cause total instrument cluster blackouts. High-output wastegates drop circuit voltage below 10.5V on heavy climbs, forcing the Marelli panel into protective shutdown. Clean your factory grounds now!

www.torquenews.com

I would consider the recommendations covered in the article, especially refurbishing all of the common ground blocks, as well as adding 'The Big 3' electrical mod, and an H8 AGM battery.

.

 

[agio]

Thank you. I did notice that the voltage fluctuate between 12.4 and 14.4 on occasion. Not sure if it's related to my problem. Forgot to mention that the start/stop always gives me the message "not ready, cooling or heating ".

 

[seems fishy]

Welcome! Hope you get some help for that as it must be frustrating.I read an article earlier online today(a reviewer was testing a RAM SSTH0) where the trailer brakes would cut out while towing, to prevent the block from overheating,in the Hurricane with twin turbos.They were experiencing temps. over,220 while towing a trailer.The turbos create alot of heat that is hard to dispell..Are you towing something when this happens? I have read when towing and the engine temperature gets very hot the truck may start to shut down prevent the block itself from damage. A bit different scenerio than yours perhaps,but if your engine is very hot this can happen,and trigger odd behavior.

 

[RamDiver]

Thank you. I did notice that the voltage fluctuate between 12.4 and 14.4 on occasion. Not sure if it's related to my problem. Forgot to mention that the start/stop always gives me the message "not ready, cooling or heating ".

You're most welcome.

The 12.4VDC is the resting battery state of charge. The 14.4VDC is the alternator voltage.
With the start/stop feature, you also have a second battery.




From what I've read, the smaller battery behind the main battery is for the start/stop function.
If the EVIC displays that the start/stop isn't available, that's likely because the battery is not sufficiently charged or defective. I wouldn't be in a hurry to fix the feature, but I detest the start/stop concept.


Chasing electronic gremlins and intermittent failures can be very challenging.
Unless you are incredibly lucky enough to suffer a steady-state failure that remains, allowing you to troubleshoot the issue, we're left with covering all the basics as the only solution.

The 3 options I offered above should not impact any warranty coverage, and I would never consider paying dealership rates to have them completed. You can get the guidance here to complete them yourself if you're mechanically inclined, or locate a trusted mechanic in a small shop to have the work completed.

.

 

[crash68]

the start/stop always gives me the message "not ready, cooling or heating ".

The Start/Stop system will keep the engine running when the vehicle is stopped if the HVAC is calling for cooling or heating. That message may stay on if you like to keep the AC at a really cold or hot setting.

 

[RamDiver]

The Start/Stop system will keep the engine running when the vehicle is stopped if the HVAC is calling for cooling or heating. That message may stay on if you like to keep the AC at a really cold or hot setting.

Thanks Crash.

I should have asked the OP if this condition persists or is intermittent.

As Crash mentioned, the start/stop function is defeated when the HVAC is working hard to reach or maintain the setpoint.

.

 

[agio]

I'm aware of the aux battery, and i don't really care if it works. I just thought there might be a connection between the 2 issues I'm having.
I have another appointment with a different dealership in August, if i get the same runaround, does anyone suggest replacing the main battery with a higher cca? BTW, the truck is still under warranty. Thanks all.

 

[RamDiver]

I'm aware of the aux battery, and i don't really care if it works. I just thought there might be a connection between the 2 issues I'm having.
I have another appointment with a different dealership in August, if i get the same runaround, does anyone suggest replacing the main battery with a higher cca? BTW, the truck is still under warranty. Thanks all.

I would refurbish all of the ground blocks and add the big 3 mod first, if it were me.

Data communications and computer modules don't play well with marginal power or ground connections.

Unfortunately, most dealerships will scan for codes and tell you to come back when the problem happens.

No codes to them means nothing to write on the warranty claim. No warranty claim equals no money for them.

.

 

[agio]

Thanks, that's what the other dealership said after trying a software upgrade, then replacing the shift module, then said they couldn't recreate the problem. What a shame, this is my 3rd Ram. Maybe it's time to switch teams....