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P0640 Diagnostic Trouble Code Discussion for September 2006

Intake Air Heater Control Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0640
Help Request Posted
1995 Buick LeSabre Custom 3.8L No Start, Poor Idle Quality, MIL Lamp on VIN: 1G4HP52L7S
P0640: QDM 1 Failure. This vehicle cam in with the PRNDL, cruise, and Quad driver codes stored in memory. The customer states that the MIL stays on, but sometimes the volts and or temp lights come on. The vehicle intermittently no-starts. We have followed the troubleshooting charts...
September 25, 2006