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P1635 Diagnostic Trouble Code Discussion for September 2013

5-Volt Reference 'A' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1635
Help Request Posted
2003 Volkswagen Passat W8 4.0L communication issue VIN: WVWUK63B13
P1635: data bus power train missing message from a/c control. We are looking for the next plan of attack. Here is some background info: has an aftermarket radio, we unplugged the radio harness from the factory connector, no change, no communication to ECM. We went to the obdII diagnostic connector and tested pin #4 for g...
September 16, 2013