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P1640 Diagnostic Trouble Code Discussion for September 2008

Output Driver 1 Voltage High Input

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Trouble Ticket Help Requests for DTC P1640
Help Request Posted
1995 Oldsmobile Cutlass Supreme 3.4L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G3WT32X2S
P1640: quad driver modual A malfuction. this 3.4 has a hunting idle which eventually will stall the engine, have checked extensively for vacume leaks with brake clean, checked egr, and also swapped it with a known good one, check tps and swapped with another. all numbers seem good an scan tool excep...
September 28, 2008