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P0640 Diagnostic Trouble Code Discussion for March 2010

Intake Air Heater Control Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0640
Help Request Posted
1996 Buick Riviera 3.8L No Start VIN: 1G4GD2217S
P0640: qdm 1 fault. OK techs I have been fighting this problem for days now we have a customers 1996 buick riviera 3.8 super charged.The engine was replaced with a new one at 113829 miles. We have replaced the ecm all the coil packs, crank sensor we tested the cam sensor it teste...
March 08, 2010