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Seth Nichols

2006, C4S, 6-Speed Manual, US - Incorrect Date Displayed on Radio/Nav Display

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I contacted Becker Service that builds the PCM's and discussed with them the issue with the incorrect/missing date. It is something they have seen on occasion and may be related to two possible issues.

  • CAN BUS communication issue with the Porsche Instrument cluster - This would need to be checked by using something like a PIWIS or Durametric or other code reader and verifying no codes are present. Clear/Fix any error codes and see if the date returns. If no errors then see next.
  • Corruption with the PCM software - They state the PCM is very sensitive to voltage spikes, low power, battery change etc especially as the units start to get older. Generally can be fixed by sending the unit in for repair.

They told me a bench test is $75 and if nothing else is wrong other than the date the repair fee would be "reasonably less" than the usual $500-$750.

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Thanks for reaching out to Becker.


Did Becker discuss the recent GPS system changes?  It's unlikely that all of us would be experiencing CAN Bus or voltage spike issues coincidental to the GPS system change timeframe.


If it is GPS related, Becker owes us a software patch.  



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