P1870

[Christopherrr]

P1870 - Transmission Component Slipping

That's the code I got today when I got it scanned after the SES light came on. For a few days now, I've noticed my car shifting exremely hard (jerk) 1st to 2nd...and a loud whistling noise.

I can get into any gear fine and it drives fine...just jerking 1st in to 2nd. Any ideas? I did a quick search on the net and all I can find is what the code means. P1870 - Transmission Component Slipping

[Dave M]

My guess would be that some component of your transmission is slipping Sorry, can't help ya more but the code sounds kinda self explanatory.

[Christopherrr]

yeah...it is self explantory.

but, jerking and slipping are polar opposites to me...guess I'll just have to get under her today and play around.

Sucks! I don't have the time or resources to get her worked on.

[Craig 94 TA GT]

I'm no tranny expert, but I'll try to relay info from what I've heard from the trannhy shop I went to. He claims that later 4L60Es have a problem where the actuator valve(?) leaks or has some kind of small problem. The PCM sees lower pressure or something amiss, so it tries to compensate by increasing the pressure and/or shift firmness. So the problem gets worse. Maybe something can explain this much better, or someone has the real facts on this. Or maybe this is all a rare case, and/or not true. Sorry I couldn't be of more help

[LeeS97Z28]

Sorry to hear this

What this means is Tranny rebuild. When I used to work at my local chevy dealership we most of the time had to rebuild the transmission or get a geniune GM remanufactured one.

[fastTa]

P1870 - Transmission Component Slipping

That's the code I got today when I got it scanned after the SES light came on. For a few days now, I've noticed my car shifting exremely hard (jerk) 1st to 2nd...and a loud whistling noise.

I can get into any gear fine and it drives fine...just jerking 1st in to 2nd. Any ideas? I did a quick search on the net and all I can find is what the code means. P1870 - Transmission Component Slipping

Most likely it is the TCC regulator valve. It is common for it's bore to get worn out and when this happens the PCM will try to compensate by telling the tranny to use "max" line pressure. This is why you are experiencing the harder than normal shifts.

Read my posts in this thread for more detailed info -->> http://www.f-body.com/forum/showthread.php?t=10597

[Christopherrr]

that explains it all...fastTA you're the shiznit! I've noticed too that it doesn't lock up in 4th...looks like I know what's happening. Will I have to drop the pan to get to the TCC valve? I'm kinda excited to do the job myself...if that's possible.

[LOUD2000T/A]

yes, pan has to come down to do the TCC solenoid. I've personally never had to deal with one of those codes at work (Buick, Pontiac, GMC dealer), but my girlfriend's old '96 camaro set one. One of the guys I work with said sometimes a new valve body will fix it ...but sometimes it won't . then you need a new trans. I never got to try either because she totaled the car shortly after.

[fastTa]

that explains it all...fastTA you're the shiznit! I've noticed too that it doesn't lock up in 4th...looks like I know what's happening. Will I have to drop the pan to get to the TCC valve? I'm kinda excited to do the job myself...if that's possible.

Yep, just drop the pan and you can get to the TCC regulator valve. You don't need a new valvebody, you just need to ream the valve bore and either install a sleeve and larger apply valve, or use one of the reamer kits by Sonnax or Performance Automotive (www.transmissioncenter.net).

It is a pretty easy fix, but just make sure that you flush the valvebody completely clean before putting everything back together.

[LOUD2000T/A]

Yep, just drop the pan and you can get to the TCC regulator valve. You don't need a new valvebody, you just need to ream the valve bore and either install a sleeve and larger apply valve, or use one of the reamer kits by Sonnax or Performance Automotive (www.transmissioncenter.net).

It is a pretty easy fix, but just make sure that you flush the valvebody completely clean before putting everything back together.

I guess that's just dealer warranty repair...replace the whloe thing just to make hours.

[fastTa]

I guess that's just dealer warranty repair...replace the whloe thing just to make hours.

Naaaah, dealerships don't abuse their factory warranty contracts.

[Ger-Fire-Form-93]

Yep, just drop the pan and you can get to the TCC regulator valve. You don't need a new valvebody, you just need to ream the valve bore and either install a sleeve and larger apply valve, or use one of the reamer kits by Sonnax or Performance Automotive (www.transmissioncenter.net).

It is a pretty easy fix, but just make sure that you flush the valvebody completely clean before putting everything back together.

Hi, I have that same problem on my 97 TA.

so, do you recommend this KIT 77754-R2 ? or Do I need something else?

thanks!