Tuesday, January 31, 2012

VW Phaeton fault codes that show up when the car is fine*

*The Phaeton has been running flawlessly.  Every feature works, with the exception of the tire pressure monitoring system (TPMS).  The flat tire light is on constantly, despite the fact that all the tires are properly inflated. I've been told by Phaeton owners both before and after my purchase to ignore this common problem.  Even after shelling out $1,300 to repair the problem, there is a high likelihood that the light would erroneously come back on.

Today, I had the Phaeton's oil changed and tires rotated.  The local independent was kind enough to plug in the diagnostic tool and print out for me the readout.  Here are the findings.  Again, I have noticed zero faults with the car, with the exception of the TPMS.

The following systems had no fault codes:

  • Engine
  • Transmission
  • ABS brakes
  • Locking and starting system
  • Seat memory- passenger
  • HVAC
  • Airbags
  • Steering wheel
  • Instruments
  • CAN gateway
  • Left light
  • Level control
  • Seat memory- driver
  • Navigation
  • Right light
  • Central convenience
  • Sound system
  • Wipers
  • Battery charger
  • Telematics
Here are the parts that contained fault codes:
  • Control head: supply voltage terminal, lower limit exceeded intermittently
  • Central electrical: intervention load management
  • Sunroof: signal to sunroof, intermittent motor for wind deflector, sunroof shade motor
  • TPMS: no signal and initialization not successful

I suspect that new batteries will correct some of the faults.  Am also considering paying $75 to have the TPMS warning light turned off.

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