I'd be looking a skewed TPS inputs to start with.
<felbi@verizon.net> wrote in message
news:2fcf5fa8-b113-4f4d-8bde-acada567b8ed@c58g2000hsc.googlegroups.com...
> Well, here is what is going on. I bought a 2006 Grand Prix GT in
> May. Since I have had it, it will from time to time disengage the TCC
> and immediately re-engage. This only occurs while cruising. It does
> not matter whether I just left for work or have driven a couple
> hundred miles. With that, of course, the tranny temp does not
> matter. This will occur at a wide range of cruising speeds as well.
> I can tell you that it seems to occur less when the ambient temp is
> lower. Not sure if the IAT effects the tranny control at all (other
> than effects to the TP). I am curious if anyone else has this issue.
> I almost wonder if it is bumping against the lower TP thershold for
> TCC dis-engage. If so, I would think I could easily google this
> issue. I almost forgot, there are no stored codes. I have cleaned
> the harness connectors. Brake switch is not the issue. Tranny fluid
> has been changed. Fluid level is correct. TFT is within TCC range.
> This occurs on level driving surfaces. It really is annoying, and no,
> it is not a miss. While cruising, the RPMs jump up a couple hundred,
> and immediately go back (as with TCC engagement) with no changes in
> speed. This happens very smoothly, but I can see it happen, so it
> bugs me. Any help would be appreciated.
>




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