2000 Park Ave. won,t shift into overdrive.

2000 BUICK PARK AVENUE
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RICHIE_1983
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I have a 2000 Park Avenue that won't shift into overdrive could this be a modulator valve. If so where is this located at on the transmission.
Aug 27, 2007 at 3:08 PM
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82STANG
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If it is something electrical in the tranny, it should give you a code when scanned.
Oct 19, 2007 at 11:51 PM