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09-26-2011
I searched but didnt come up with anything. Now and then my wifes car, 97 Grand Prix 3.8 non s/c, will get code p1870 and shift out of o/d. Just wondering if anyone else has had this problem and what the fix was. Other than that, the fluid is good and shifts fine.
Thanks,
Dave
09-26-2011
Snagged this via google.
PO1870 is a slip code for the transmission. 99% of the time the pcm picks up the torque converter clutch slipping.
The reason the torque converter is slipping is because the valve body TCC regulator valve bore is wore out. The only way U will fix this is with a repaired valve body, new or rebuilt torque converter, and most of the time if U have gone that far U might as will rebuild the trans.
Don't wast your money on trans flushes, or fluid and filter changes, those things are transmission upkeep, and are needed to up the voscosity of the ATF. U are to late.
Originally Posted by W-Body Store
09-26-2011
Sorry Dave,
I had misread your code and thought it was for a P01810.
Last edited by stuzman; 09-26-2011 at 08:37 PM.
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