16840/P0456/001110

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16840/P0456/001110 - EVAP System: Very Small Leak Detected

Possible Symptoms

  • Malfunction Indicator Light (MIL) active

Possible Causes

  • Fuel Cap not fully attached
  • Evaporative Emission (EVAP) System leaking/faulty

Possible Solutions

  • Check Fuel Cap
  • Check Evaporative Emission (EVAP) System

Special Notes

VW

  • On 2006 and 2007 Passat, check fuel cap part number. Updated version ends in "G". Please refer to Technical Bulletin 2016757 for details.

Audi

  • Audi A6 (4F) with 3.2 V6 FSI. When this DTC is stored see if this NAR market TPI applies to the vehicle in question: 2020900. That's a flash update to correct a software problem with specific Engine controller part number(s).
  • NAR (North American) Market TPI 2027732 contains information for possible flash update to correct a software problem with specific Engine controller part number(s) in addition to replacement NVLD pressure sensor G400 and/or NVLD control module J909.
  • NAR (North American) Market TPI 2035073 contains information for possible NVLD pressure sensor G400 and the NVLD filter updates:
  • For the Tiguan with the 2.0T DGUE engine that has one or more of the following fault codes, please see TSB 054615 for possible ECM update and hardware update.