Transmission Shifts Hard

[growe3]

Well things have been going great, but I now have a problem with my 2004 DTS.

While driving to work at around 65 MPH, I downshifted to 3rd when exiting the freeway; the shift was very hard.

During the short distance to my office, from the off ramp, the shifts through every gear were hard.

I checked the diagnostics and it had registered a P2763(Short to voltage in the TCC Solenoid). This sets

the transmission line pressure to maximum, hence the hard shifts.

My manual suggest checking the wiring harnesses for problems, all of the wires that I could get at seemed fine;

no visible damage, clean and dry, nothing chafing.

Later I drove home, and it shifted fine until a few minutes down the road, and then it started shifting hard again.

My guess at this point is the solenoid may have a short in it, if so wouldn't be to hard to replace. I hate

throwing parts at a problem so I thought I'd see if anyone had some ideas on this issue.

Question:

Has anyone else had this code, and if so what was the solution?

-George

[BodybyFisher]

A little off topic but I replaced my TCC, ISS and Pressure Solenoids. You will need to get into the side pan, I tilted my engine carriage after much work, Ill link you to my thread if you decide to do the job.

In our HOW TO section under transmission a member posted a nice how to for the ISS speed sensor, I think he points out the TCC in the narrative