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P1640 Diagnostic Trouble Code Discussion for May 2005

Output Driver 1 Voltage High Input

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Trouble Ticket Help Requests for DTC P1640
Help Request Posted
1995 Buick Park Avenue Ultra 3.8L MIL Lamp on VIN: 1G4CU5218S
P1640: QDM 1 Circuit. Replaced leaking vacuum lines and O2 sensor which showed bad. Went through diagnostic flow chart, points to PCM. Replaced PCM still has code. Tested all wiring to sensors (Boost solenoid, TCC, EVAP solenoid). Tested all powers and grounds. Unplugged solenoids,...
May 04, 2005