95 GTP 4 gear TCC isnt locking in

**Adabow12** · 08-04-2011

Hello over the past year my car has gone in and out the TCC locking in, if im using the term correct. At first I thought it was over drive but after some research i found that it isnt over drive but 4th gear has a TCC that locks in which drops the rpm's. So lately it hasnt been locking in, I have replaced the trans fluid and new filter. The car drives fine I would just like to have the lower rpm's on the highway. When the TCC use to lock in I could cruis at about 2 grand at 65mph but now without the TCC I am at like 2500 to 2750 on the highway. Any ideas on what it could be?

**94GrandPrixSE** · 05-04-2012

TCC solenoid in the trans my car has the same problem but mine only happens half of the time normally if the trans is hot from a long period of driving and i put in in park and back to drive it will only go to 3rd gear. when it happens to me on the highway i put my car in neutral and turn it off and back on and usualy it wont come back on unless i put it in park again. the solenoid is relatively easy to replace.

**Undercrazed** · 09-03-2012

I have the same problem. I only noticed it about 2 weeks ago. About 2 months ago I replaced all the solenoids in the trans. Now I have this tcc not locking issue. I did read in another forum about a 94 regal with the same issue and it was simply a 'second' brake switch. Do our pontiacs have this? Also, another guy mentioned it was dry and cracked vacuum lines on the modulator. Any ideas? I'm burning a lot of gas like this.

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