2006 Chevy Impala with a P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit trouble code. In this video I will show you how to test and repair this fault code with universal testing methods that can be applied to all cars and trucks.

Engine Performance Diagnostics - chapter 3


  • check engine light (P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit)

fix 50

  • replace faulty EVAP vent solenoid

test shown

  • how to test a ground side switched solenoid
  • how to verify wiring integrity
  • how to test the computer transistor driver

Tools used

  • scan tool
  • digital multimeter
  • lab scope
  • test light

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(Chapter 3) Transistors, Solenoids, Computer Controlled Output Testing

Related videos:

EVAP leak P0455 (vacuum cut valve-bypass valve test) - Nissan:


How to test an EVAP Vent solenoid (applies to all cars) - GM:


Evap System Large Leak Detected P0455 (sticking vent solenoid) - Nissan:


2008 Chevy Avalanche EVAP Vent Solenoid Test (P0449, P0455):


EVAP Leak Test P0455:


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium. There is a 14 day free trial.

On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!