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CP4 to CP-ISB21S3 (revised CP3) change for 2021 6.7L Diesel Trucks -- Merged Threads

BAT3500 said:
Does this change apply to the ecodiesel's too?
I am batting 0 for 1 on those critters but might try a one again if they replace that pos cp4.
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I am 2-0 with the ecodiesel. Not one issue with my '14 or '16. Both made it to 100,000 miles without the fuel pump failing.
 
Thankfully the right choice has been made. Hopefully the owners of 19 and 20s will see swap recalls.
now the big question is would it cost FCA more money to do a recall/swap or just let the trucks run fix the ones that die? This is FCA/rams chance to show customers that they don’t make decisions like Ford does.... 6.0 we will never forget........
 
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BLuRRnAWAY said:
run it until your warranty is about to expire, and then pickup a new 2021 or 2022! I wouldn't worry about it if your warranty is in tact!
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Xflight29 said:
all your worries are just ruining your experience of having your truck. Drive it and enjoy it, you will be fine.
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I would agree with you guys, the warranty is there and a decent safety net as long as you're close to home when it happens. However many of us use these trucks for long range towing. So if your halfway across the country towing your travel trailer, 5th wheel, or commercial load through the Rockies and this thing decides to take a dump, you're gonna have a lot more problems on your hands that the warranty won't help with.
 
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g00fy said:
I would agree with you guys, the warranty is there and a decent safety net as long as your close to home when it happens. However many of us use these trucks for long range towing. So if your halfway across the country towing your travel trailer, 5th wheel, or commercial load through the Rockies and this thing decides to take a dump, you're gonna have a lot more problems on your hands that the warranty won't help with.
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Very true. I would do the math and figure out is a conversion and loss of warranty worth it, or conversion once the warranty is up.... or just trading it in for a newer model.

Just sucks because these trucks can run a million miles and you have one faulty part that can be catastrophic... if it did happen out of warranty I’m sure insurance would pickup the bill, however you would end up paying that back in the long run. No matter which way you spin it, ram should just sack up and recall CP4 and put all of these owners thoughts at ease.

Like you said, traveling all over hauling or traveling with family the last thing you need to worry about is getting low on fuel and the CP4 sending shards through the motor.


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I doubt FCA will spend more unless forced. I've got coverage until 2027 or 100,000. And I've got Good Sam coverage if I need a tow for my camper.
 
I drive into remote places. The last thing i want is to take a truck in these places with a known problem as help is a long ways away. This issue has got my full attention.
 
Squatch said:
I was looking at that today, doesn’t require any programming either, nice!
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Correct.
Drop in. No tune and DIY with some tools of your own. I’ll do mine next weekend/week.


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It will be very interesting to see how this plays out for the 19 & 20s.

Some very rough math for example:

$800 cp3, fca probably gets it cheaper
$400 shop labor for swap
$1,200ish tsb vs. $15,000 shredded cp4 repair kit?

So 8% the cost. I wonder if the failure rate combined with reputation would make it worth while for them to entertain replacing them in the 19 and 20s. I mean, people are finally going to be getting there hvac boxes replaced for poor hvac. I would think this would be a comparable cost........
 
BAT3500 said:
Just keep in mind any warranty goes out the window if the tech pulls the bad fuel card. Been there done that with my 1500 ecodiesel.
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Please provide links to more than one known warranty denial on a CP4.2 - not including commercial fleet. Otherwise it's just BS internet gossip.

AFAIK, there's been only one well know denial. Had the owner retained all fuel receipts, that would likely not have occurred.
 
Burton12387 said:
It will be very interesting to see how this plays out for the 19 & 20s.

Some very rough math for example:

$800 cp3, fca probably gets it cheaper
$400 shop labor for swap
$1,200ish tsb vs. $15,000 shredded cp4 repair kit?

So 8% the cost. I wonder if the failure rate combined with reputation would make it worth while for them to entertain replacing them in the 19 and 20s. I mean, people are finally going to be getting there hvac boxes replaced for poor hvac. I would think this would be a comparable cost........
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Different front housing so your math is off right from the start.
 
Brutal_HO said:
Please provide links to more than one known warranty denial on a CP4.2 - not including commercial fleet. Otherwise it's just BS internet gossip.

AFAIK, there's been only one well know denial. Had the owner retained all fuel receipts, that would likely not have occurred.
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February 2019, my personal truck, 2016 1500 ecodiesel. Unknown during the event CP4 took a dump while starting on a road trip. Limped to local ram dealer. Tech found grenaded cp4 with resulting debris in the entire fuel system. Tech blamed water in the fuel, produced a crappy dirty sample of fuel, and all warranty coverage was denied. Did the sample actually come from my truck? Who knows, i wasn't able to witness when the sample was taken. Fuel tank was emptied and fuel disposed of before i informed of the situation and permitted to get a look.

Fuel receipts? Had them, didn't matter. Doesn't matter where you bought it, if FCA can claim any kind of fuel contamination all warranty coverage is lost, it is clearly written in the warranty coverage, even in maxcare plans. I strongly suspect this wasn't the true issue, or at the very least not resulting from the last fill up. I used the same exact pump less than 12 hours after i had originally filled up the 1500 to top off my 2500 so i could complete my original planned trip. I had no issues with the 2500 using the same fuel source to complete a 400 round trip.

Believe me or not, I don't care. 7k repair bill to fix the truck after which i promptly traded in.
 
BAT3500 said:
February 2019, my personal truck, 2016 1500 ecodiesel. Unknown during the event CP4 took a dump while starting on a road trip. Limped to local ram dealer. Tech found grenaded cp4 with resulting debris in the entire fuel system. Tech blamed water in the fuel, produced a crappy dirty sample of fuel, and all warranty coverage was denied. Did the sample actually come from my truck? Who knows, i wasn't able to witness when the sample was taken. Fuel tank was emptied and fuel disposed of before i informed of the situation and permitted to get a look.

Fuel receipts? Had them, didn't matter. Doesn't matter where you bought it, if FCA can claim any kind of fuel contamination all warranty coverage is lost, it is clearly written in the warranty coverage, even in maxcare plans. I strongly suspect this wasn't the true issue, or at the very least not resulting from the last fill up. I used the same exact pump less than 12 hours after i had originally filled up the 1500 to top off my 2500 so i could complete my original planned trip. I had no issues with the 2500 using the same fuel source to complete a 400 round trip.

Believe me or not, I don't care. 7k repair bill to fix the truck after which i promptly traded in.
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That just begs the question: what the hell is the FUEL FILTER for ? and you have to replace it every oil change?
 
johanh13 said:
That just begs the question: what the hell is the FUEL FILTER for ? and you have to replace it every oil change?
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I change both fuel filters every oil change. I have never had the Evic indicate that they neede to be changed sooner than the oil change indicator. I usually change my oil when it is at 25% remaining.
 
g00fy said:
The more i think about it, the more i feel like they're going to have to issue some sort of recall or TSB if they don't want to get sued.

Switching back to the CP3 is basically an admission by Cummins/FCA that the CP4 is defective, and if they don't do something to take care of those of us with the bastard CP4's they're gonna be opening themselves up to a hefty class action suit that will probably stipulate them having to install CP3's in our trucks on top of whatever monetary compensation they're gonna have to fork out and whatever legal fee's they'll have to cover.
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Everyone is forgetting the Dimple when talking about the switch being guilt admission. They revised the pump for just a few short months of production before changing the design out entirely!

That's how much of an emergency this was. A global automaker does not spend that kind of money and effort on a band-aid fix to cross the MY finish line. Enough with this 5%-7% failure crap. Those numbers are from additive MFGs.

The 19-20 Asym CP4 was a big enough problem that they crammed out an emergency fix with no official documentation on WHY right before scrapping the whole design, that's all you need to know about how bad this was for them.

FCA doesn't have a leg to stand on for denials anymore for anyone who actually puts up a fight. Now the big question of whether they bastard year the 19-mid20s or do the right thing and get them sorted out. It's up to us who spent big money on these trucks in 19-20 to not let this die down and just go away or they will have much less motivation. IF they do the right thing, it will go a very long way in the enthusiast community for reputation. It's a way for people to point to a fact on why their favorite brand is better compared to the status quo of Ford/GM in doing the "sucks for you" route.
 
That is the one major difference between the ecodiesel and the HD trucks, unless they recently changed ecodiesel truck system has only one fuel fuel filter, located near the tank like our rear one. Worse, in my case, unbelievable at it seems, that particular truck had no WIF sensor on or near the filter. I had no advance warning, and i was way under recommended maintenance interval in the owner manual.

I too have started to change fuel filters at every oil change on my 2020 truck, just went thru my first change recently, just not worth the risk otherwise in my opinion.
 
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