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Hummer Knowledge Base

The Hummer Knowledge Base

H2 Fueling Issues:

f you get a Diagnostic code for the EVAP system, P0446 in particular, or if you start to have filling issues, where you can't seem to fill your truck up with fuel do the following:

  • Crawl under the drivers side rocker panel
  • Locate the round container near the EVAP canister
  • Remove that round device (filter)
  • Clean it up, as it is likely covered in mud and debris
  • Re-install and clear code
Relocation of this filter assembly is possible but may cause issues with filling your fuel tank.


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