Do not change your purge solenoid or any other components without first checking your gas cap! The manufacturer doesn't list EVAP leaks (loose gas cap), as one of the causes of this code, so it is no wonder so many people are having issues.

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.

In this video I will be showing you how to test for an EVAP system leak, using a smoke machine.

I will be testing the Intake and Exhaust Camshaft Actuator Solenoid Valves in this video. The vehicle is a 2012 Buick Verano with a 2.4L Ecotec engine. These solenoids are high failure items on this particular engine.

This case study I did on a body shop vehicle covers a lot of starter circuit theory and operation, as well as practical testing methods, making it great viewing for anyone working in the field.

  1. How to test a purge solenoid (Mazda P0443, P0455)
  2. EGR Closed Performance P1404 with new EGR valve installed (GM)
  3. How to test Intake Valve Control Solenoids (codes P0028, P0082) - Subaru
  4. GM EVAP Vent Solenoid Testing