Just had the HPFP replaced under the Y78 recall two weeks ago. Overall, I’m seeing equal or slightly better performance (May be in my head), but shifting has definitely improved. With the Aisin, my 2-3 shift has always been rough, especially under load. It felt like the truck was trying to defuel just before the transition, but the timing was way off or out of sync with the hand off from 2nd to 3rd. No dealer has ever been able to address it, but the CP3 may have done it for me.
On the more mysterious side, fast forward to today when I brought the truck back in for a “Service 4WD” light (frayed wiring harness from chafing) , and trying to get it done under warranty. The dealer (same one that did the Y78 recall) is saying that when they pull codes, they’re getting one that indicates the truck has a non-factory tune. The tech said the code is something like P1400. This truck is absolutely bone stock except for some aftermarket shocks. Has anyone else run into this “aftermarket tuning“ code after getting the Y78 recall done? I know the PCM software for the 2019s had to be tweaked to accommodate the CP3 if the VB06 recall had already been done. Could it be that the brand new flash software is somehow seen as a tune because it it so new? Maybe that’s a stretch, but I can’t think of anything else. The truck’s never been tuned and no dealership has ever raised this code with me before, even this dealership. The CP3 and the related PCM flash are all that’s changed before this code shows up this morning.
They say its done, I will post my thoughts on the Recall later, I have to drive 40 minutes to get back home, from the dealer.
