Question about 2006 Buick Grand National

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My 87 T-Type no longer goes into overdrive. Any suggestions?

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This can be caused by a failed Vehicle speed sensor or a mechanical fault in the transmission or the OD solenoid, run a test on the system and see if u have any fault codes. here is how to do a OBD1 GM fault code test, go to the link
http://www.extreme-check-engine-light-codes.com/GM%20OBD1%20Decoder.htm

Posted on Sep 30, 2010

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