A TFP manual valve position switch (Pressure Switch Assembly) malfunction could
set DTC P1870. Ensure final drive ratio matches PCM calibration. The following
mechanical conditions could set DTC P1870:
TCC PWM solenoid.
Internal transmission failures.
Transmission range switch DTC.
Code indicattes slipping so high possibility the trans has to be rebuilt.
Wednesday, October 17th, 2012 AT 7:51 PM