6l80 WOT Pressure Dip

[Cal Naughton Jr]

Having a weird issue where the PCS 4 Cmd Pressure momentarily dips mid 1-2 shift. Stock 2015 Silverado, only transmissions changes have been an increase in Oncoming Pressure Preset. Any ideas?

6l80wot2.hpl

[TransGo Robert]

Without the ISS and OSS logged it makes it hard to know for sure what is actually happening, but my guess is that your desired shift time is too long and the computer sees the shift happening too quickly and backs off the PCS to try and fix it.

[Cal Naughton Jr]

Spot on. Lowered the Torque Factor and it's back to flawless. Highly recommend SilverSurfer77 4 and 4a videos for a breakdown on the 6l80 shift timing. I will also be charting the PCS and ISS/OSS values moving forward. Thank you!

[TransGo Robert]

Spot on. Lowered the Torque Factor and it's back to flawless. Highly recommend SilverSurfer77 4 and 4a videos for a breakdown on the 6l80 shift timing. I will also be charting the PCS and ISS/OSS values moving forward. Thank you!

Glad to hear you got it fix and that it was an easy fix.