17964 p1556 charge pressure control negative deviation possible symptoms reduced power output limp mode possible causes boost pressure too low hoses pipes incorrect connected disconnected or leaking charger pressure control defective vnt variable nozzle turbo nozzles stuck solenoid valve for boost pressure control n75 defective. Page 1 of 2 fault code 17964 charge pressure control negative deviation posted in tdi diesel forum im not getting much joy in the vag com section of the forum so try here my mpg has dropped quite significantly and im noticing a loss of power at the lower range. Hi there just got my vag com softwareon my 2002 vw passat tdi 130 sport did the diagnostics and got this fault code under the engine controller 17964 charge pressure control negative deviation p1556 35 00 ive had a look at the wiki but its not very specific
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