I've just read through every thread with a tranny problem here and didn't see this here.

On my way back from Raleigh, NC over Memorial Day, my girlfriend was driving through the first stage of the mountains. The SES light came on as the engines surged a little bit.

We stopped at the next rest area to see what happened and to give the engine a short rest. A half hour later, we pulled out of the parking space (R) just fine, but shifting to drive (O) made the engine struggle at pushing the car until it got up to speed. The Rest Area has a slanted road area, so I didn't think anything of it. The light was off.

Over the next six hours on the way home, the transmision was running 3-3.5k at speeds of anywhere from 60-85mph. (It was NASCAR Traffic, after all.) Going 85mph at one point I was passed by a motorcycle going at least 95 who would slow down in the area between lanes, since there were cars on both side, to yell at the vehicles on the left about moving to the right lane... He almost got run down by a construction truck...

Anyway, when we stopped at for lunch 3 hours into this 6 hour drive, my temperature guage showed about 200°. We tried to park in as much shade as possible. Transmission fluid level was fine when we took her over to the cas station. Color was red, too. I had a fluid exchange last spring and then a seal and filter replacement only a couple months ago, so I didn't expect a problem. I also replaced the Cat just 6 weeks ago, so engine cooling hasn't been a problem since.

Ever since, when the car gets to operating temperature, I can mostly expect that once I get up to a speed around 40mph, the transmission won't shift down. I can shift it to 2nd (D2) and move fine, shifting when I hit the right speed/tach. When I let it cool down, it starts fine.

I am going to take it to the store that can read my codes in a few minutes, but I thought I'd check in here to see what might be. I suspect that I have something gunking up my transmission cooling lines, causing the fluid to get too hot and lowering the vicsocity so that the automatic transmission doesn't know when to shift due to expansion or something. Or something I could never guess is happening. I suppose the PCM (which I replaced the same weekend as the Ignition module) could be overheating, too.

One note that I don't believe to matter... I had to replace my Ignition Module in Mossy, WV on the way down when my ignition stopped going uphill on Rt 77. I pushed it about a half mile to within 100 yards of the service station before I couldn't push anymore. That'* my second replacement. I don't know if that has any relevance, but it was only a couple days earlier, so who knows.

If you have any suspicions, post them. I'll have the code(*) in a couple hours.

It figures that all these problems would come just shy of 195,000 miles. I really want to get those 5k out of it.

All right, here'* the list. Gotta love that the Advance Auto down the road has the right adapters to get these for me for free. I'm sure they make enough from the parts I buy to make it worthwhile many times over.

P0341 Camshaft Position Sensor I've gotten this for a couple years with three differant sensors

P0565 CC Servo Position Sensor Signal Circuit Problem That finally explains why my Cruise is intermittant.

Now stuff that seems to apply...

P0650 Quad Driver Module QDM 2 Fault
P0740 Torque Converter Clutch (TCC) Failure
P0755 F31 Transmission Solenoid Failure

As it was explained, the QDM is the computer. So, it'* possible that my computer is causing the problem by itself.

Would it make sense to replace the Computer and the Solenoid and see what happens? The computer'* a cinch and only $100. The solenoid looks like an easy replacement if I can find it and was either $45 or $75. Either way, still cheaper than taking it to a transmission shop, where I'm sure they'll want to replace the TCC right away.

The clutch must work since I can **** into 2nd while stopped at a light, right?

Called a transmission shop my mechanic likes. The guy there said to swap the computer before considering anything else. He thinks he'll have to do some continuity testing if that doesn't do it. Well, it didn't. So, I've ruled out one possibility.

I'm going to try to replace the Transmission Solenoid too. The problem is that no one has them around here. At least they're only $30.

I dropped her off at the Transmission shop tonight. I should know tomorrow what the damage is.

I'm guessing that it'* the transmission solenoid. They said they'll replace both solenoids (Transmission and TCC) since they'll already be in it if that seems to be the problem.

Wish me luck. I just want another 5 to 10k out of it...

Something tells me that the fluids getting really thin and that your trans is REALLY overheating. Maybe check the cooler lines for a blockage?

I'm going to test my fluid after I get her back to see if I need to do something a little more permenant like a trans cooler or something.

I did find out that it was the solenoid. The shop is replacing both the TCC and the one that triggered the code for about $400. Does this seem about right? I'm having them do it, regardless, but it would help me decide if I like this shop or not.

Well, they replaced the solenoid for 1 & 4th gears and also the TCC solenoid. I got 1st and 4th back! That'* good. But now I'm getting that darn surging problem. I don't know if I can afford for them to look at it again. The mechanic did say that there was still a Quad 4 driver code being thrown. The computer'* been replaced within the week. It'* unlikely that that'* the problem. No lights, so I'm really not all that worried.

Sounds like a 5 volt supply problem...

Dude, this thread is 16 years old. Why are you replying to threads this old?

If a thread/post is more than 6 months old, we would prefer that you not reply to that thread, but instead make an new thread with a link pointing to the old one.
Most of the time, the OP'* haven't been on in years and more than likely they won't respond.
See forum rules: https://www.gmforum.com/introduction...-first-304557/
Thread Closed.