Trouble code P0446?

Tiny
DONNIEB1
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 121,000 MILES
Have trouble code p0446 check engine light is on?
Sunday, January 31st, 2010 AT 4:28 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The code:
P0446 : Evaporative emission (EVAP) vent system performance.

https://www.2carpros.com/trouble_codes/obd2

This code gets triggered if there is a leak on the EVAP system. The EVAP system includes the fuel tank, vapor canister, vent valves etc.
Sometimes this code appears when the gas cap unable to seal the tank properly. When that happens the fuel vapor will escape the system and that will trigger the light. It can also be triggered for a leak any where else in the system.
Replacing the fuel cap is usually a good first step.

https://www.2carpros.com/articles/evap-system-code-repair

I have attached step by step diagnostics for that code.

Please let me know of any questions.
Thank you.
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Friday, August 27th, 2021 AT 8:16 PM

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