So a buddy of mine is having some issues with his 6.0/4l80e 2001 chevy 2500 not locking the converter at times it should lock (by all appearances)

Were wondering if it's cold temp disable but I can't find any table in HP Tuners that appears to control this.

He did find a PID # 14546 TCC OFF COLD "B" and it's not accessible via any table page we can see.

We have also verified the converter locks when commanded with special function.

And it's only an intermittent issue to make diagnostics even more difficult.

Has anyone else seen TCC clutch temp enable table? I could swear there was one! Maybe it's only on the P59 computers?

 

Does it have any misfire codes? If so, it won't lock it up.

 

Ive got 2 express 3500 co vans running the same setup as you. On a cold morning when it's below 40 each one will take about a mile or 2 roughly before the converters will lock. I set both of em so they don't lock up till 4th gear so it was way more noticeable when they were on full stock tunes.