Dodge Ram Promaster 2500 broke down and stranded :(

Backstory: We purchased the van in April of 2021 and drove it a lot for two months with 0 issues

We made a cross country trip from AZ to GA to see family. When we got to TX there was a heavy downpour and tough storms. We started seeing issues here and all sorts of error codes popped up. 20-25 codes came up on scanner and our dashboard was lit up. Van went into limp mode on several occasions (very dangerous!) and intermittently would not start. We limped back to GA eventually and dried the van out and it worked for a week. Checked it at a Dodge dealership and they could not find any issues. We proceeded with our journey with small issues here in there with electrical which we originally thought was water related (and still could be)

We made it into South Dakota with 0 issues and started our adventure. We had one issue where it didn’t start and went into limp mode, again, after it had rained. We brought it to another dealership and they could not figure it out. We brought it to an independent mechanic who jiggled around some wires and eventually had it good enough to run where we felt safe then cleared our codes. We drove for a couple weeks no problem.

Got into Wyoming and did not have any issues. Spent a couple weeks in a few towns but had a severe issue outside of Sheridan WY and had to make an emergency pull over and we tried to troubleshoot it ourselves. I reconnected wires, reset battery, dried out different components and it worked! We kept on our drive to visit areas in WY then made our way to our destinations in Montana next. No issues for a week or so in Montana. Drove through Billings-Bozeman-Butte-Missoula no problems. In Missoula we had a delay, again after it had rained, and after i did the same old trusty steps of jiggling some wires and letting it rest we drove right on ahead.

We were heading to Kalispell when disaster struck us in a small town of Polson MT. Worst trouble yet and most errors. Stalled out at a red light and barely limped out of traffic into an autozone. Stranded for two days after working on it tiredly ourselves, we called a tow to get it to a local mechanic. Mechanic took a week and didn’t find any thing wrong with connectors, battery or wiring. Van was fine for about 4 days then disaster all over again. Had so few places to stay we were stranded again. We had to call another tow and reluctantly got it towed back to Missoula at their Dodge dealership there. This has been a month now since being stranded and had a very difficult time finding places to stay without going broke. We are flying out of here tomorrow to stay with some family to just reset everything.

Dealership has had it over a week now and they aren’t 100% sure of the issue. They replaced the ECM because they thought that was the issue, check every wiring harness and connector point and found no issues. We are running out of ideas and are very worried we will have to list it as a total loss. :frowning:

Sorry for the long story but we are in a desperate situation since our whole life is in the van and we are with our dog. No many resources left or choices. If anyone has any advice it would be extremely helpful!

Really sorry to hear about your troubles. I assume that the van is no longer under warranty. Seems to me that bad design, or something else that was changed in the van, is allowing the electronics to get wet. Once the electronics are wet, corrosion may have set in (either in the connectors or internally), totally screwing it up.

I think the solution may be to check all the electrical components and connectors to see if there’s a corrosion and/or wetness problem, and get to the bottom of why things are getting wet in the first place. No modern vehicle should have trouble in wet weather. That’s my analysis from afar.


The Transits & Promasters both have problems with leaks getting into the electronics. I don’t remember which was which, but with one it was the seal around the hood, and with the other, the water that came into the fresh air vent behind the hood, drained onto the electronics.

Good Luck!


"I start saving money with the vehicle purchase,
and pay practically nothing to convert it." ~ Road Warrior

That’s a large bummer, we haven’t had this issue. Most engine compartments are going to get wet, regardless of make or manufacturer and are designed to handle some water. It’s not like they’re sealed off from the bottom either. Curious as to what year your Promaster is?

We personally haven’t had this issue driving in heavy rain, nor known anyone with it. Looking at the promaster forum it looks like some people believe this also caused this or other issues and are resealing the area around the cowl and the hood with some extra material.

Maybe it would be worth a shot as they seem to think it’s a $25 fix.

We originally thought it was connectors and the pins since we had most of our trouble in rain. However I couldn’t find anything, other mechanics didn’t see any corrosion, tears or any other problem.

The dealership went through the whole electric schematics and check every connection and no issues, no bent pins, no corrosion… nothing. It’s messed up now more so in the dry weather so we are just totally unsure if it was rain after all.

We tried sealing the window cowl but it messed up anyway. We will reseal once we can.

  1. We saw on the Dodge Promaster forums where some people had some water issues but we think we may be beyond that since we were in MT and WY for a while and still having trouble (does not rain much in those areas)

We have sealed the window cowling but still had issues so makes me think it is something more than water now.

@THRU - I would do a few things if you have not 100% for sure. Check you vin for recalls. It looks like there was a recall for 2014 promasters for electrical and water issues ( Either way you’ll want all this done to you vehicle if it has not been. It should not Cost anything.

You should get your ignition coils, plugs, wires, any other standard part of and all your filters changed. If you haven’t done that it is probably worth it as it could be done yourself and won’t cost a ton of $$$. It does sound a bit like a coil could be bad or going bad.

Figure out where all the grounds are on the vehicle and clean and tighten them yourself. You should be a able to find a numbered list with some googling if it isn’t in the manual. But a loose or corroded ground could cause also cause the symptoms you are seeing.

Sorry to hear of your trouble. Reading your post all I could think was that you were indeed patient and committed to soldiering on.
Is this a brand new vehicle?
If yes, you may be entitled to utilize an applicable lemon law in your state of purchase.
It is a process involving proving your troubles and expenses with a new vehicle.
While your issue is likely fixable, some vehicles are lemons hence lemon laws.
I hope you fix it and rack up many miles and adventures but at least researching cutting your losses may be prudent.
Good luck,

Some states have lemon laws for used vehicles too, but returning it may not be realistic if you’ve already put a lot of time and money into a conversion.