tomtomLS1Z28

my car will lock up at all, it will go into 4th gear but it will stay loose. its a performabuilt 4l60e. when i took it to get it check the code that came up was P1870. not sure whats going on with it. i had to replace the trans pump and when we put the trans back in the car and drove it around, the car would no longer go into lock up. but yesterday when i was driving it OD kicked in, but later on that day when i drove the car again OD would no longer work again. i replaced the wiring harness (used one) but that didnt help either. any other suggestions on what it could be?? i was told that it could be o-ring on the input shaft, i just dont know what else to do. any help will be appreciate it.

mrvedit

Not to be (overly) mean, but a search for "code 1870" in the transmission section lists 363 threads. It is one of the most common problems.

Just this week:
https://ls1tech.com/forums/automatic...s-problem.html

Last week:
https://ls1tech.com/forums/automatic...-question.html

And others:
https://ls1tech.com/forums/automatic...1-2-shift.html
https://ls1tech.com/forums/automatic...1870-code.html

Please read those and come back with any specific question you might have.
And again - sorry to just give you links, but this is a frequent question.

tomtomLS1Z28

not harsh at all bro, i appreciate the help. i found out what i need it to do. i have had hell with this transmission and i was just about ready to give up. the trans has been dropped about 4 times trying to figure it out. i guess i should have googled "p1870" lol. but once again thanks bro

tomtomLS1Z28

ok i looked around and read that the main cause for this was the tcc valve. well i bought a kit from trans go and changed the tcc valve and drilled the wholes as the instructions said. well i still dont have lock up and got the p1870 come up again. is there anything else it could be? the transmission was working before my issue with the pump, all we did was change the pump put it back in the car and then it didnt work. is there any possible way the pump could be causing it? i will be dropping the transmission again tomorrow so i just want to know every possible thing i could do to get it to work.

mrvedit

First, please confirm that we are talking about a '98 -'02 car and trans.
Sorry to hear that a "P1870 fix kit" didn't work for you; it usually does.

Concerning the replacement pump, confirm that it was labeled "PWM", e.g. for '96 or later transmissions. The main TCC solenoid needs to fit snugly into the pump with its o-ring. I've heard of other worn parts in a pump causing no-lockup, but I don't know those details.

tomtomLS1Z28

Sorry, yes its a 98-02 transmission and a 2000 camaro. I bought the transmission from Performabuilt. On the pump I am not quite sure, I had Performabuilt send it to me after the one on my transmission start it to leak from the seal. I had only drove on the new trans for about 2 weeks and then the pump leaked and thats when I replaced the pump, so I wouldn't think there would be any worn out parts (I hope). Ive just had it with this transmission !! Lol

mrvedit

Ok, I'm sure Performabuilt would have sent you the right pump.
Another possibility is that the converter's lockup clutch is completely worn out. What do you know about the converter?
Have you contacted Performabuilt yet? Frank is very active on this forum.

tomtomLS1Z28

I have a yank ss 4000. And had only had it for the same amount of time as the new transmission before pump seal going out. Like I said the set up was working before I had to change the pump. Frank did say that it could be the o-ring on the input shaft. But I don't think that would give me a p1870 but then again maybe it could. I'm just wondering if maybe we did something wrong installing the pump. I talked to the guys at yank and they told me that if the converter was working before replacing the pump that it couldn't be the converter that's causing the no lock up.

mrvedit

The o-ring on the input shaft does indeed seal the TCC lockup hydraulic circuit. If you forgot it, or ripped it, you would have no lockup.

tomtomLS1Z28

Man I would be soooo mad if its just that, but would be happy at the same time lol. Tomorrow when I drop the transmission I will make sure the o-ring is in place.

jimmyblue

iTrader: (11)

What converter? Do you know?

Smaller than stock converters are often marginal or
worse, as far as ability to hold motor torque with low
line pressure. And 0% commanded is what you get
at highway cruise, before TCC duty takes its cut.
I've had bad slippage and frequent P1870s on a
10" cheapo converter with stock force motor settings.

Instead of repeatedly R&Ring a piece that may not
even be responsible, some diagnostic scanning is
a good idea. Looking at TCC slip RPM, TCC duty,
commanded line and force motor current along with
the input & output shaft RPM and current gear can
tell you exactly what is slipping, and probably why.
If you can interpret the data.

tomtomLS1Z28

9.5 Yank ss 4000.

performabuilt

iTrader: (25)

A missing or damaged oaring is very likely however yes do if possible some scans of data may give and idea . With the oring missing you would probably have 4th when cold as lockup is not commanded . Once warm it would be commanded but fail this would set code and disabled lockup attempts and 4th gear.
Frank

tomtomLS1Z28

Thanks frank. Before doing anything tomorrow I'll have my buddy scan it with HPT

mrvedit

The o-ring has to be removed to replace the pump.

To scan with HPT, you have to select which parameters to scan; only a very limited number can be scanned at once, especially with a 2000 PCM. Select the ones jimmyblue listed.

tomtomLS1Z28

well pulled transmission yesterday and sure enough the o-ring was missing. thanks for all the help guys.

mrvedit

Congrats on finding the problem; guess you are happy to fix it but "soooo mad" about the effort needed.

I probably should have mentioned the o-ring earlier in my posts, but most people want to fully explore the possibilities that don't involve removing the trans. But I will always mentioned it in the future. I'm sorry if my oversight caused you the time/money to unnecessarily replace the TCC valve.

tomtomLS1Z28

I guess its my fault for not wanting to drop the transmission. I should have had listen to Frank from the beginning. But being that all the treads about p1870 would point to the tcc valve being bad that's what I decided to try out first. But I appreciate the help tho, without the help I would still be scratching my head lol