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P1640 Diagnostic Trouble Code Discussion for March 2008

Output Driver 1 Voltage High Input

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Trouble Ticket Help Requests for DTC P1640
Help Request Posted
1994 Buick Century Special 3.1L MIL Lamp on VIN: 1G4AG55M5R
P1640: Computor code. ... a leaking head gasket. Changed the head gasket, started the car and the code came on I have no idea what caused it to come on. The car runs good, has no driveability problem but the light comes on and then it goes off and comes back on again. I cannot find...
March 15, 2008