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OBD Scanners Discussions on using On Board Diagnostic (OBD) scanners/ Diagnostic Equipment related to TDIs

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Old March 17th, 2006, 19:05   #1
Join Date: Nov 2003
Default OBD2 code P1556

What does a Charge Pressure Negative Deviation code (P1556) mean on a 2001 Jetta TDI? Jettanut
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Old March 17th, 2006, 19:43   #2
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Join Date: Dec 2005
Location: Trenton NJ

Did you just replace your MAF or clean you intake? I got one of those when playing the night I got mine a new MAF. I reset it with the Vagcom and it never came back
Y2K Buglet {2000 NB} :-}

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Old March 18th, 2006, 05:39   #3
Join Date: Nov 2003
Default P1556

Yes I did just replace MAF and have gotten this code and reset at least 6 times. Thanks
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Old March 18th, 2006, 06:28   #4
Veteran Member
Join Date: May 2003
Location: Between Toronto & Montreal
Fuel Economy: 5.3 l/100 km (at 115 km/h)

You need to test your N75... could also be a leaking vacuum line or a stuck turbo actuator...

How many miles on the car??

Do you have access to a Vag-Com ???

Where are you located? Perhaps there's a TDI specialist not too far away...

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Old March 21st, 2006, 02:59   #5
Join Date: Nov 2003
Default P1556

121,000 miles, just replaced Timing Belt about 119,500. Replaced MAF Sensor about 120,000. I live in southern part of Shenandoah Valley in Virginia just off I-81. Nearest dealers in Roanoke or Staunton Virginia.
P1556 very interm.
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Old March 22nd, 2006, 22:09   #6
Join Date: Feb 2006
Location: Modesto California
Fuel Economy: 42-45
Default Check your hose connections after the intercooler

I got the same code and it was a clamp that was positioned improperly on the bottom of the intercooler allowing air to leak out!

Look there it won't cost you anything!

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