I just had my trans rebuilt, 97 Auto, and put it back in. Everything was fine... torqued to speck. Now I am getting a trouble code of "trans component slipping." Cleared the PCM but it came back on a day later, so it's definately something. Anyone know if this is external or internal, or had this code pop before? Thanks.

 

Help?!

 

It's easier to look up if you give the code number.

The pcm is detecting a difference in transmission output shaft speed as opposed to engine speed when the TCC is engaged. The pcm will default to doing several things when this code is present, including:
-inhibit TCC engagement
-set maximum line pressure (not really good to drive a lot with it like this because it can cause more problems)
-inhibit 4th gear in hot mode
-freeze 1-2 shifts from being updated

It can be as simple as the pcm getting an improper signal from the VSS or the transmission range switch is not indicating properly. You could also have a bad pressure switch, TCC solenoid, TCC PWM solenoid or mechanical failure of a shift solenoid.

If you don't know what all this stuff is, seek a good transmission shop.

BTW, if the problem goes away, the SES will go off after 3 consecutive ignition cycles without a failure detected.

 

there is a problem witht he valve boy wearing from the valve body, you will ahve to replace it with a new one. maybe try the transgo kit which may fix it otherwise you have to get a new valve body. the TCC PWM wears in its bore and leaks causeing a slip in it .

 

I get this code as well once in a while on long trips. This is what ive learned about it through my research. If you take it to the dealer or a transmission shop with the code, you will get robbed. If you change the valve body out, the code may or may not go away. Ive also heard a transgo shift kit makes it go away and have bought one but have not installed it yet. I have contacted pcmforless to see if they can stop the code from comming on and at this time they said they cannot but may be able to in the near future.

 

That code has popped up on my car before. What I noticed was after I had been driving a while, my transimssion would start shifting extremely hard as if I had a shift kit. Then if I pulled over on the side of the road and turned the car off for a few minutes, everything would go back to normal. I talked to a GM guy and he told me I needed a new transmission or a rebuild, but I did a little research on the Internet and found that there were quite a few other people who had the same problem with their 4l60e and that all they needed was a simple tranny flush. The reasoning behind that was sometimes the valve body in the tranny sticks and when it opens a gush of fluid comes out resulting in the firm shifts. In some cases the "sticky" valve was fixed by a simple tranny flush. Luckily a flush fixed mine, $100 is much better than $1400.

I don't know if this is your problem or not, but I figured I'd tell you my experience with the P1870 code.

 

The hard shifts come from the fact that the pcm sets the line pressure to maximum when the code is present (as I outlined above). Ask any good tranny person and they will tell you that constant high pressure is not good for the life expectancy of your tranny.
The part about a solenoid sticking and flush helping it out is viable, since a solenoid problem can cause the code. A flush could be what it needs.

 

Im wondering if I clear the code with my scanner while im driving if it will revert back to normal line pressure. I will try it next time it throws the code. By the way, it will only throw the code after the trans is fully warmed up. there is actualy a trans temp signal going to the PCM.

 

yeah the TCC wont engage until normal temp is reached is why. try the transgo kit b4 you buy the valve body

 

The code pops up as soon as the car is turned on... and stays up.

BTW, thanks for all the help guys.