Stop TCC from disengaging at 0% TPS at highway speeds

American Delco GM ECUs and PCMs, ALDL, OBD 1.5.
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rjdrew1986
Posts: 33
Joined: Thu Apr 13, 2023 6:52 am

Stop TCC from disengaging at 0% TPS at highway speeds

Post by rjdrew1986 »

Does anyone know if there is anything that can be changed in a P04 calibration that would stop the TCC from switching off when the throttle is closed? More specifically, I have the tables setup to there the TCC switches on & off at the MPH & TPS that I desire and that works fine. But my driving habits are such that as I'm running along at say 55mph (with the TCC ON), there are occasions when I briefly let off the throttle (for a subtle amount of deceleration) & each time the TCC switches off. It does re-engage when I re-open the throttle but I would prefer to have it that the TCC does not switch off each time I close the throttle (unless the MPH were to decrease enough). I was thinking that perhaps I might be overlooking something obvious that would accomplish this.
gmtech825
Posts: 209
Joined: Fri Feb 24, 2017 11:27 am

Re: Stop TCC from disengaging at 0% TPS at highway speeds

Post by gmtech825 »

there should be a flag in the calibration to enable tcc coast mode. I haven't done anything with the p04 so I can't point you in the direction on where to find it. I did find it for my p59, and I also found the tcc coast mode while braking so that tcc stays on when braking as well. It drives so much better with those two changes.
immortality
Posts: 3538
Joined: Thu Apr 09, 2009 12:31 pm
cars: VH, VN, VS, VX

Re: Stop TCC from disengaging at 0% TPS at highway speeds

Post by immortality »

I did the same on a earlier V6 model, different PCM.
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