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P1635 Diagnostic Trouble Code Discussion for October 2010

5-Volt Reference 'A' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1635
Help Request Posted
2002 Ford Focus SE 2.0L unable to reprogram VIN: 1FAFP34352
P1635: vehicle id block does not match vehicle hardware. i have determined that pcm is at fault and have a used replacement. took car to dealer to have pcm reprogramed to match vehicle and was told that pcm would not accept information. they also tried to reprogram remanufactured pcm that was in vehicle and it would...
October 25, 2010