Last Year I had a buddy of mine rebuild my transmission and I put it in. Since i have put almost 30,000 miles on it. Now all of a sudden I'm having a check engine light come on and i got it scanned at autozone and it came up as p1870. Does anybody know what this is? My inspection is due next month and in the lovely state of NY you cant pass with a check engine light on. i don't hear anything that could be wrong no sounds at all and the fluid is fine. It shifts smoothly. Thanks

P1870 is a generic Torque Converter Clutch code. It usually means the TCC is slipping. Did you get a new Torque Converter when it was rebuilt? If not, the TCC might be worn out.

The problem could be in the valve body, either the Auxillary Valve Body Solenoid, the Governor Pressure Switch, or the Oil Pressure (TCC) Switch. Mine likes to throw that code in hot weather, every once in a while, with the A/C on and with intermittant stopping, but it's not the TCC, it's done it with two different new Torque Converters. It's not the temprature, I have an external cooler and the temps never have gotten over 180*.

I did buy a new cloutch converter and also we replaced the solenoid. how would i check too see if its the oil pressure swutch? thanks

Pull it out, connect an ohm meter to the lead(s) and/or body and add some air pressure (about 46-54psi to close) to the inlet of the switch. The switch should close with the pressure.

where exactly is taht located?