Question about 1997 Buick LeSabre

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My car runs perfect but it has code p1870. oil trans looks a little light brown, i dont have any problem with the trans, it works very smooth. why check engine light it says code p1870????? can a dirty oil trans be the problem, thanks. 125000 miles.

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  • toneman2121
    toneman2121 May 11, 2010

    I would changing the trans fluid and filter to start. Although, what i read about this code says there is a mechanical failure, the symptoms you describe are not the same as what read. If you google. "Buick DTC 1870", you will find usefull information regarding the fault code.

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Yes, when you burn your transmission fluid, its just like when you burn your motor oil. Lower vescosity means more friction. more friction, more heat, more heat messes with your sensors inside the trans causing them to send a code to the ecm. do a filter change and transmission flush. clear the code and retest.

Posted on May 05, 2010

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