Why is TCC not locking up on this?

[GrannySShifting]

I have set it to lockup above 34mph period, Shift Lock is Enabled so it should stay locked during shifts, and you see it drop TCC pressure on part throttle 3-4 shift at 3:00 minutes (after being locked) takes forever to command it lock back up again - like 7 seconds later. Then during WOT it was locked and let it go soon as floored it (3:30 into log)

Missing something somewhere

[Cringer]

I have set it to lockup above 34mph period, Shift Lock is Enabled so it should stay locked during shifts, and you see it drop TCC pressure on part throttle 3-4 shift at 3:00 minutes (after being locked) takes forever to command it lock back up again - like 7 seconds later. Then during WOT it was locked and let it go soon as floored it (3:30 into log)

Missing something somewhere

Try maxing out/disabling the misfire tables.

[GrannySShifting]

Not showing any misfires. I dont zero them out, I raise the tables so false misfires arent shown but if you pull a plug wire off or something to dead the cylinder itll still function and tell you.

Ill give it a try temporarily though to see

[Cringer]

IIRC you are logging current misfire, but you may want to try adding historical misfires as well.

[Alvin]

Not showing any misfires. I dont zero them out, I raise the tables so false misfires arent shown but if you pull a plug wire off or something to dead the cylinder itll still function and tell you.

Ill give it a try temporarily though to see

It doesn't have to be at the point of a misfire code to inhibit TCC.

[GrannySShifting]

It doesn't have to be at the point of a misfire code to inhibit TCC.

Yeah it just has to show some in the counter but I havent seen any on any cylinder?

[RDF1]

My 2500HD was doing something weird like this.
I ended up disabling all Misfires and maxed out the tables as well as disable P0300 for a test. And it worked. iT wouldnt show any on the counter or history but something in the misfire deal was making TCC unlock.

[Alvin]

Just disable misfire stuff.

People made it just fine diagnosing a misfire the old fashioned way.

[GrannySShifting]

Still unlocks at WOT even though all tables say stay locked. The Full Throttle TUTD table is missing though, is that why its not perhaps? HPTuners sloppy with putting all the damn tables in every OS

[GrannySShifting]

Just disable misfire stuff.

People made it just fine diagnosing a misfire the old fashioned way.

Did that, still wont stay locked at WOT. Using latest BETA all tables say should be locked above 30 something mph it doesnt. At a loss on this one, just flashed it back to stock using dealer stuff, and redid all the tables to wipe out anything that may have been done in the background that I cant see with HPT - still does it

[GrannySShifting]

Try maxing out/disabling the misfire tables.

Doesnt work

[04silverado6.0]

Not a solution but you can lower your regulator gain. 75/1.5=50 psi 75/1=75 psi. Have you tried disabling shift lock? Wouldnt be the first time hpt got something backwards.

[mikez71]

High speed lock enable/disable?
Stock has identical values (8191).
Yours locks below 8191, unlocks above 8190.
Glitch despite not hitting 8190 rpms?

Or your brake pedal switch is too sensitive, and activates at WOT.. ?

[RDF1]

Is this the 09 G8 correct vin?

[edcmat-l1]

Stock converter? Aftermarket?

Have you tried locking it with the scanner and seeing if it stays locked?

[abc]

Have you tried locking it with the scanner and seeing if it stays locked?

I don't think this is the same but I will mention it just in case is sparks something: I suspect HPT is only capable of locking the converter if specific variables are met. For example: I tried to lock the converter (on a PO1 PCM) that was calibrated to only lock up in 4th. I was in 3rd at a low throttle angle and pressed the TCC lock button in HPT and the convertor would not lock. I did not test this theory any further and dismissed it at the time as I knew the TCC was functioning correctly with the current calibration to lock up in 4th above 50 mph and below 40 percent throttle angle.

I know this is a GEN 4 forum but another piece to note: In my PO1's, the Shift Lock Enable does nothing whether it is enabled or not. I read on this site that some of the PCM's got the button in HPT but there is no function to it.

[edcmat-l1]

Typically in the GEN3 PCMs the TCC lock up works flawlessly.

In the T42s specifically, you cannot rely on the scanner bi-di controls to lock and keep it locked.

GEN4 stuff if you get them in manual and use the bi-di controls you can get the TCC to stay locked under most conditions.

If you could not manually (bi-di) lock a P01 I'd suspect a mechanical issue.

To clarify ^^^ a mechanical issue may just be an aftermarket converter that can't hold the power, or a factory converter, the same.

[GrannySShifting]

Or your brake pedal switch is too sensitive, and activates at WOT.. ?

We cant see brake switch status in these can we?

High Speed lock values are from a GM dealer reflash from stock. Just did that yesterday trying to see if file was corrupted or something

[GrannySShifting]

Typically in the GEN3 PCMs the TCC lock up works flawlessly.

In the T42s specifically, you cannot rely on the scanner bi-di controls to lock and keep it locked.

GEN4 stuff if you get them in manual and use the bi-di controls you can get the TCC to stay locked under most conditions.

If you could not manually (bi-di) lock a P01 I'd suspect a mechanical issue.

To clarify ^^^ a mechanical issue may just be an aftermarket converter that can't hold the power, or a factory converter, the same.

it locks up flawlessly using bi-directional controls.
its an aftermarket single disc, and will stay locked with little to no slip if using scanner to do so (reports 577psi on TCC lockup or whatever) I am running into some slipping when its part throttle, commanding it to lock and you tip in throttle and its 50-80psi TCC lockup and it cant hold it but thats another problem - SIDE NOTE why can the scanner command 576psi but we cant make computer do that?

I had a 1400rwhp CTSV a few years back that would show slippage even with a triple disc. On the dyno when I commanded lockup and it showed the 576psi or whatever the slip was very minimal but going down track it would only show the 100-110psi or so and slip 300-400rpm. We needed it to get it through the traps. Was looking into a way to hard wire a switch to get it to command max lock up pressure but never figured it out. Apparently stock LSA bottom ends dont like 8000rpm (and the 1430rwhp prob didnt help)

[GrannySShifting]

Not a solution but you can lower your regulator gain. 75/1.5=50 psi 75/1=75 psi. Have you tried disabling shift lock? Wouldnt be the first time hpt got something backwards.

Yes HPT is a bunch of dummies and Ive seen it backwards but its been set to Enable and Disable (and it stays locked through part throttle shifts both ways it seems)