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11-18-2021, 06:33 AM #11
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Robin & John
2020 Ram 3500 LB SRW 4WD Crew Laramie 6.7HO Aisin, 55gal Titan 4014 payload
2022 Solitude 310GK-R - Dual pane, factory solar & Onan, 8K axles with discs, 18K GVWR, W/D, Heat Pump, Goosebox, Battleborn
2023 stays
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11-18-2021, 06:45 AM #122021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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11-18-2021, 09:23 AM #13
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I think RAM is only doing the recall due to NHTSA starting an investigation several months ago. RAM has been stringing everyone along for two years, telling everyone a "service solution is coming", one update on the pump (CP4.2 in the '20), and all of a sudden when NHTSA gets involved, a recall happens.
One of the things that I have been reading, is that RAM is over driving the CP4 by 50% to get the fuel pressure they need, which is a major contributor of the high failure rate. Ford is not over driving the pump, and has less failures, or not enough for NHTSA to do anything.
Looking at the Mopar website, my VIN is already listed as part of the recall.2023 Chevy 3500HD CC SB 4x4 Dmax
2021 GD 320G with 8K axles
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11-18-2021, 05:06 PM #14
The CP4.2 is not an update. The .2 stands for 2 cylinders. They make a CP4.1 which is a 1 cylinder pump for the smaller motors, and it has the same problems. Most everyome just calls them all CP4s.
As for the overdrive you speak of... This is the first I have read of it.
There is no need to overdrive that pump as it puts out more pressure than the CP 3 it replaced, and is plenty capable without overdriving it.... So I am skeptical on that.
On another note; Reading thru the ram PR, it states an expected failure rate of 4%.... That is right at the same as Ford and GM, when I saw the NHSTA documents on this years ago.Last edited by huntindog; 11-18-2021 at 05:11 PM.
2021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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11-18-2021, 05:07 PM #15
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Robin & John
2020 Ram 3500 LB SRW 4WD Crew Laramie 6.7HO Aisin, 55gal Titan 4014 payload
2022 Solitude 310GK-R - Dual pane, factory solar & Onan, 8K axles with discs, 18K GVWR, W/D, Heat Pump, Goosebox, Battleborn
2023 stays
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11-18-2021, 05:32 PM #16
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2019-2020 RAM Cummins had two versions of the CP4 - Asymetrical cam (early) and Symetrical cam (later). Documented in TSB 18-060-20. Quick way to tell is the size of the drilled dimples on pump - small dimples (various numbers of them) Asymetrical - large dimple Symetrical.
Robin & John
2020 Ram 3500 LB SRW 4WD Crew Laramie 6.7HO Aisin, 55gal Titan 4014 payload
2022 Solitude 310GK-R - Dual pane, factory solar & Onan, 8K axles with discs, 18K GVWR, W/D, Heat Pump, Goosebox, Battleborn
2023 stays
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11-18-2021, 06:43 PM #17
I had heard that before. Not sure why that would be an improvement.
But I have seen the CP4.2 mentioned as an updated version on several websites, so that is a internet myth that refuses to die. There may be different versions of the CP4.2 with all of the big 3, but they are all CP4.2s
What version do you have? early or late. This could be a clue as to just how extensive this recall will be.2021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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11-18-2021, 07:02 PM #18
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All 4.2s you are correct. But the cam lobe difference requires different PCM flashes so there has to have been some internal changes. I have the early version with the small dimples. TSB attached.
Attachment 37784Robin & John
2020 Ram 3500 LB SRW 4WD Crew Laramie 6.7HO Aisin, 55gal Titan 4014 payload
2022 Solitude 310GK-R - Dual pane, factory solar & Onan, 8K axles with discs, 18K GVWR, W/D, Heat Pump, Goosebox, Battleborn
2023 stays
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11-19-2021, 02:34 AM #19
I can understand why the PCM flash would need to be changed due to a cam lobe change.... It is similar to putting a bigger/different cam in a gasoline motor. The fuel calibration needs to be changed then.... What makes no sense is to how that would affect reliability of the pump, in a signifignant manner.2021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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11-19-2021, 06:33 AM #20
Cam profiles. Ramp speed, surface loading can all change dramatically with different cam profiles.
From a historical standpoint the early diesels (like late 1800s) had overly complicated injection systems that used huge, very high pressure air compressors.
That was the most common failure point then.
Then slightly lower pressure but more precisely controlled mechanical injection became the norm for about 80 years.
Now we are back to a very efficient injection system that has issues due to the extreme pressures.
The circle is complete.
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99 Ford F-250, 7.3, 6-speed.
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