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P1870 is Transmission Component Slipping. I have also heard of it referred to as The Code Of Death.
Trouble code P1870 means: Transmission Component Slipping (4L60-E, 4L65-E, 4L80-E)
Trouble code P1870 means: Transaxle Component Slipping (4T60-E)
Trouble code P1870 means: Transaxle Component Slipping (4T60-E)
Trouble code P1870 means:Transmission component slipping
Transmission component slippage.
Transmission comp. slipping.
Trouble code P1870 means:Transmission conponent slipping
Trouble code P1870 means: Transaxle Component Slipping (4T60-E) Replace the sensor on the transaxle
P1870 is a transmission slipping code I think P0133 is the left front sensor (drivers side) but i will check on that. For the transmission code the first thing to do is service the transmission and check for debris in the pan....more than a "tablespoon" rebuild the transmission.... according to GM bulletin. Try the service and keep your fingers crossed
That code is a transmission slip same code came on with my 96 Cutlass Supreme
Rebuild trans. Pay someone to do it too.