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P0651 Diagnostic Trouble Code Discussion for December 2014

5-Volt Reference 2 Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0651
Help Request Posted
2012 Volkswagen Passat TDI SE 2.0L MIL Lamp on, Derate VIN: 1VWBN7A31C
P0651: Reference voltage b open. Hello everyone. This VW came to us with the check engine light and DEF lights on and customer had a complaint of it derating. It's been to the dealer multiple times for the same problem with no luck. Reference voltages and glowplugs tested fine. No sign of any...
December 30, 2014