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Just my guess, but the trucks built with the first version CP4 were all the 2019, and a few of the 2020's... like mine. When they changed to the second version CP4 with less cam ramp it took a software change for that pump. Hence there are two different software packages installed on recalled trucks.
I posted what has been stated, I have no idea why the two years have different software. Hell, that may not be the reason at all, but it makes the most sense.
That's fair you don't know, was just responding to your comment. As someone that works on software, I will tell you that it does not make any sense to me.
The only thing i can see is calibrated may have to tweek the tune due to the CP3 calibrations but that should just be a matter of you loading the tune then sending a log file after a day or so of driving
Thanks, that makes sense. The only Calibrated tech who said yes, said about the same as you. The other three said no need to do anything
The changes i suspect we will see are only to the fuel pressures i am sure we may see a decrease in rail pressure and perhaps some slight timing changes to compensate for the decreased rail pressure. My tuner is also ready to do the updates as needed when my truck gets back to me i deleted my truck but and will be flashing back to stock so they can do the recall then i get to pull the exhaust off as i had kept the intact tuning now it will be full delete tuning.
I'm holding off buying a tuner with parts until I get this recall dealt with.
I dont think you would lose if the flash is done right even with lower rail pressure.
Sounds like you have a very competent dealer. Please keep us posted.
Same here . Check engine light came on. Def temperature sensors failed. The def tank needs to be replaced as part is nonserviceable. My understanding that filters are before cp4 pump.
The tank should not need to be replaced just the pump as its got the temp sensor in it
Very interesting see i had a touch of glitter in DEC when i changed my filters so perhaps mine may need the complete package but until i saw your post i was under the common theory here that the pump fails all at once not gradually dieing
Wow! I too, have been told, read about and heard that the failure was instant, no gradual, etc. Now you and g00fy report otherwise. Hoping the pre-changeout inspections can detect that glitter and report accordingly.
