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P1639 Diagnostic Trouble Code Discussion for November 2019

5-Volt Reference 'B' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1639
Help Request Posted
2014 Ford F-150 Lariat 5.0L Poor Fuel Economy VIN: 1FTFW1EFXE
P1639: Vehicle ID Corrupted/not programmed. New customer to us. Original complaint was very hard to start and poor mileage. Dealer replaced whole lotta parts- some under warranty, some customer pay. He never got resolution to either hard start,or poor mileage. What I noticed was flex fuel learned wa...
November 18, 2019