Have a P1870 code on my 96 Ciera. I installed a new TCC solenoid but still get the code. Car runs and drives fine, no noticeable problem. I know the code is set when the PCM detects trans component slippage then it inhibits either 4th gear or lockup (can't remember). Question is what are the common causes/fixes. I know this is a fairly common problem on this trans...Thanks in advance.
- posted
20 years ago