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P1640 Diagnostic Trouble Code Discussion for May 2009

Output Driver 1 Voltage High Input

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Trouble Ticket Help Requests for DTC P1640
Help Request Posted
1995 Buick Riviera 3.8L MIL Lamp on VIN: 1G4GD2211S
P1640: QDM 1 failure. Hello all. Hopefully some one can point me in the right direction. The two codes that keep returning seem to be at the same time. Performed flow chart testing for both codes but only the EGR test was definitive in failing the part but the EGR has been replaced...
May 05, 2009