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P1639 Diagnostic Trouble Code Discussion for February 2014

5-Volt Reference 'B' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1639
Help Request Posted
2007 Ford Fusion SEL 3.0L MIL Lamp on VIN: 3FAHP02197
P1639: Vehicle ID Block Corrupted or Not Programmed. ... Found the coil fuse blown. Changed the fuse and it blew again when we tried to start the car. Pulled the plenum and found 2 coil packs on the back side was burnt. Replaced all 3 coils on the back side and the plugs, changed the fuse again and blew the fuse...
February 26, 2014
2003 Buick Regal GS 3.8L MIL Lamp on VIN: 2G4WF52143
P1639: 5-Volt Reference 'B' Circuit Malfunction. ... feel like I am likely missing some info! p1639 sets as a "hard code" as soon as its erased. Followed the diag tree. I have a solid, steady 5v. Replaced sensor as part of following Diag tree. A/c works fine and blows cold. It's the engine light (p...
February 27, 2014