Trying to diagnose a 4l80e not upshifting. I am trying to log gm.gearcom (commanded gear) but whenever I select that PID (had to validate to make it active) and then try to connect I get a 'generating error' report ($31 I believe). I tried to connect multiple times after restarting, new cable, etc... finally connects ONLY when I disable that PID.

Desperately need this PID to figure out why I'm not shifting out of first ( I can command gear changes through DVT. VSS is dead on, TPS reads correct, shift table is normal, MAP reads normal)