What happens if you don't change the cam phaser?

[dsiggi]

Some trucks didn’t have a cold start rattle but could exhibit a knock noise at hot idle; the calibration corrects that issue. Which is the reason the reprogramming should have been done first.

Not really. The general public spends far too much time and effort speculating about things via the internet instead of just following the manufacturer’s direction.

The recall was straightforward. Receive letter, schedule appointment, have the update done, and you get the extended coverage.

Yea i feel ya. That makes sense on the hot idle. Some of us have had bad luck with Manufacturer programs in the past. Many that dont work, ie freezing door locks. I cant get calibration engineers to completely agree with all of this either, so everyone still seems to have their own opinion. Calibration 101 answer, software can only do so much to solve long term durability issues if the hardware isnt up to the duty cycle.