I purchased an 07 TL back in 2016 at around 90K miles. I am at around 135K miles now and just recently moved from IL to MI a couple months ago and had to change my radiator because it busted and most recently changed up my timing belt.

I feel like I'm having an issue with the transmission again because recently now, when I start it and I'm on the road, the RPMs upshift too quick and my speed is not catching up (feels like my transmission is revving too hard). I would barely hit 20 MPH and my RPMs would hit 3000-4000 already. I've read other forums saying it might be a solenoid issue? I've checked for fluid leaks and ATF fluid looks good. I've also restarted the car's battery system because I thought it might be a computer system issue. Nothing seems to work. It's happened once before but only persisted for a few minutes before it resolved on itself after restarting the engine.

Is this normal? How am I able to fix this? What's the diagnosis or how can I go about troubleshooting this? Much help would be really appreciated. Thanks in advanced.

 

its definitely not normal....

 

Of course. haha. Any advice??

 

I am not to knowledgeable with these things but I would start at the basics:

I know you mentioned you restarted the battery, try resetting the ECU via the pedal method. I doubt this will help in anyway, but at least your throttle response will be neutral.
When your noticing the upshifts too quickly, what is the temperature of the engine? If you are driving cold, it could be the engine compensating depending on how much throttle you giving it.
Are your rpms hanging and then shifting into the next gear? What happens when you going 20MPH and rpms are at 3-4k?
It could be a number of things, but my guess right now, with limited info would be possibly pressure switches need to be swapped out or your tranny is dying.

 

How did you come to the "fluid looks good" conclusion? When was the last time it was changed?

Replace your pressure switches.

 

Yea i would do transmission reset via pedal, then fluid flush, then replace pressure switches which seem to help many of the TL owners with tranny issues.
Let us know how it goes!

 

may be a video of your driving can help us see how exactly what its doing during normal driving.

 

I will definitely try and do a restart via pedal method. Did not even know about that, and I just found a youtube video about how to do it.
The temperature of the engine remains fine, neither too hot or cold. Just closer to cold because I just turned it on.
My RPMs are not automatically shifting into the next gear while I have it in automatic mode. I have to drive it in sports mode in order for my speed to keep up with my RPMs.
While I am driving around 20 mph and around 4000 RPMs, the engine is revving loudly under the hood. The car is still traveling trying to gain acceleration.

I just checked my solenoid sensors and all seem to be functioning okay via voltmeter. Is there anything else you suggest? Thanks in advance.

 

Let me make sure I understand correctly....if your driving the car in Drive, not triptronic or manual shift, the car will not shift into a higher gear? Meaning your car remains in first gear unless you switch over to manual mode?

If that's the case, your issue maybe much more serious sorry to say