P CODES (POWERTRAIN) P1600 - P1699 P1640 Questions

1995 Buick Riviera Code P1640

1995 BUICK RIVIERA
Check Engine Light Is On. Code Comes Up P1640 Which Gives Me 3 Possibilities. The Torque Converter Locks Up Ok, So That Eliminates One....
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Asked by JDMOD2

1994 Chevy Lumina Engine Code P-1640

1994 CHEVROLET LUMINA
What Is A Quad Driver Module 1 Failure?
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Asked by RAYBECCA4US
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