16840/P0456/001110

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.

• 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.
  • P0172, P0300, P0301, P0302,P0303, P0304, P0441, P0456, P060C, P2440 and/or P2450
    • https://static.nhtsa.gov/odi/tsbs/2019/MC-10162819-0001.pdf NHTSA

• For the 2013-2019 Jetta 1.4 engine that has one or more of the following fault codes, please see Tech Tip 01-19-06 (2056714/1) for info on N80 Purge Valve testing
  • P0441, P0442, P0455, P0456
    • https://static.nhtsa.gov/odi/tsbs/2019/MC-10166734-0001.pdf NHTSA

• For the 2018-2021 Atlas with the 3.6L CDVC engine with P2407 or P0456, please see TSB 01-21-09 or TPI 2063514 for possible ECM firmware update.
  • https://static.nhtsa.gov/odi/tsbs/2021/MC-10201749-0001.pdf NHTSA

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 2040924 and TPI 2035519 for possible updated LDP part number 7L8-906-271-A
  • https://static.nhtsa.gov/odi/tsbs/2016/SB-10093296-0699.pdf NHTSA
  • https://static.nhtsa.gov/odi/tsbs/2014/SB-10065706-6903.pdf NHTSA
    • 2013-2015 Q7

• NAR (North American) Market TPI 2021418 contains information for possible flash update to correct a software problem with specific Engine controller part number(s)
  • https://static.nhtsa.gov/odi/tsbs/2013/SB-10065664-6903.pdf NHTSA
    • 2009-2009 Q5 with 3.2

• 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.
  • https://static.nhtsa.gov/odi/tsbs/2014/MC-10122276-9999.pdf NHTSA
    • 2012-2012 A6/A7 with 3.0
    • 2011-2018 A8 with 4.2

• NAR (North American) Market TPI 2035073 contains information for possible NVLD pressure sensor G400 and the NVLD filter updates:
  • https://static.nhtsa.gov/odi/tsbs/2015/MC-10123710-9999.pdf NHTSA
    • 2015-2015 A3
    • 2013-2015 A4
    • 2013-2015 allroad
    • 2013-2015 A5
    • 2013-2015 RS5
    • 2013-2015 A5 Cabriolet
    • 2013-2015 Q5
    • 2012-2016 A6
    • 2012-2016 A7
    • 2012-2016 RS7
    • 2011-2015 A8