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Code P1870
I have a 1999 GMC Safari, trans was working fine until yesterday after driving for a while then all of a sudden tranny started to shift hard on second shift, like hitting a speed bump, it did it like about 7 to 8 times while I was driving. Had to stop and chedk the fluid, seems to be ok, I took off and it went away, after a while it shifted hard again on second gear. Today I went to goodyear and have them service my tranny and went to autozone to scan my DTC code, it says P1870, Manufacturer controlled transmission, any idea what this controlled transmission, anyway was able to reset it but any help is greatly appreciated, thanks
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