I just visited my local and reliable transmission repair shop in Rosemount Mn. He was kind enough to perform a diagnostic test drive at no charge using his Snap-On analyzer. I had previously replaced only the TCC solenoid. No codes activated during the test. His analyzer did show some slippage due to the viscous torque converter of between 50 and 140 RPM, again , not enough to trigger my computer to issue a code. The 140 range was only achieved going up hill at 65 MPH during acceleration. Find a good transmission shop and ask them to perform a similar test drive.

 

I hope that fixes it, but the specs for converter slip is -20 rpm to 100 rpm slip. When the TCC is applied, the engine is coupled directly to the transmission through the TCC. The TCC slip speed should be near 0. If the PCM sees a slip of greater than the maximum allowed(100 rpm in this case) for more than 4 seconds under a given engine torque, it will set the code.
Fingers crossed!!

 

Ok, seven months and several thousand miles after replacing just the tcc solenoid after it had melted and mal-functioned, the transmission is working fine, no service lights or codes.

 

In another thread, a transmission mechanic said the TCC Solenoid fails due to internal issues. But, when my Cadillac dealer looked at it, they said ONLY the TCC was bad. Similar to others, they wanted $1800 to replace the $30 part. My Extended Service contract would not fix either internal seals or the solenoid, so I can do nothing but "live with it". So, this is proof that the TCC Solenoid WILL go bad on its own.

TS

 

what all do u mean overhaul or rebuildt ,I'm getting a trouble code, p0741 tcc stuck off??I know it needs a torque converter probably an Solenoid plus the seals where the shaft is ,is there any thing else that yall do,I know an filter an gaskets.i mean it shifts fine an all ,the only thing I can feel the torque converter tho ,but seems to be fine tho ,so is there anything else or what ??thanks for ur time in advance, when u get a chance thanks 😊

 

"Overhaul" or "rebuild"--along with "remanufacture"--all signify about the same thing. There's no legal distinction among those terms, although if you believe the propaganda, "remanufacturing" is somehow, mysteriously more involved and more complete and therefore "better" than the other two.

Point is, the entire transmission is taken apart, all parts inspected, and replaced if faulty. There are usually various upgrades done at the same time--high-failure parts replaced with stronger items, for example. The transmission should come out of the process "better than new"; but of course that's going to depend on the level of attention given to each one of the hundreds of pieces inside an automatic transmission. Which is why the last two (rear-wheel-drive, 4-speed overdrive) transmissions I had overhauled by my favorite local shop were about $3000 each; and they weren't as complex to begin with as your Cadillac transaxle. An overhaul/rebuild/remanufacture of a transmission is not for sissies; and it won't be inexpensive unless you're Bill Gates.

If that were mine, I'd take it to a reputable transmission specialty shop, and ask them for their opinion--and estimates of both time and money for repairs. MAYBE you don't need a complete overhaul. Perhaps a replacement solenoid, harness, fluid flush plus filter, would fix the problem. Who knows? Maybe it's as simple as a broken wire in the wire harness, or a bad connection.

No telling until it's been examined. In MY driveway, the first thing that would happen is to connect a scan tool, drive the car, and see if the computer is commanding torque converter lockup--and see if the engine RPM drops when it does so. If that happens, I'd clear the code and see if it comes back. If the code doesn't come back...problem solved.