P0446 code 2001 gmc savana 5.7. Replaced purge solenoid and canister vent solenoid. What's next? Evap pressure sensor? Carbon canister? Where are these located?

60

Asked by Oct 05, 2014 at 11:07 AM about the 2001 GMC Savana G3500 Passenger Van Extended

Question type: Maintenance & Repair

6 Answers

79,145

The EVAP vent valve is most likely blocked with dirt and dust. Either replace it or blow it out with compressed air. There's a service bulletin about this. HTH. -Jim

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60

The canister vent solenoid (EVAP vent valve) and purge solenoid (on the engine intake) were replaced. They weren't defective. I didn't check that the hoses weren't blocked so I will so that next. However, could P0446 also be a defective fuel tank pressure sensor or carbon canister? Where are those located?

3 people found this helpful.
79,145

The pressure sensor is actually part of the fuel pump assembly. It is replaceable seperatly but the pump assembly must be removed to get to it. The canister is going to be near one of the rear wheels. Usually the driver's side. Check the wiring going to the vent valve as well. Yes, check that the lines going to and from the vent valve are clear. Let's stick to what the code is telling us. Since GM has issued a Service Bulletin about this, it's a known problem. HTH. -Jim

60

I checked and replaced the evap vent valve and purge solenoid. The lines appear clear. There is 12v at the evap cent valve connector (disconnected from valve) but as soon as I connect it to the valve voltage drops to 0.1v. When does the EVAP do the self test? I want to make sure the computer is applying power to the EVAP vent valve wen I check for voltage. Can I use a scanner to make it so the EVAP self check? I suspect these but don't know how to check them: - gas cap? - charcoal canister? - engine computer? - EVAP fuse?

3 people found this helpful.
79,145

The EVAP system is the hardest readiness monitor to set. The best thing I know to do is just drive normally. But keep the gas tank between 3/4 and 1/4. No more or no less. The system also won't run the diagnostic test in cold weather. If you have a sophisticated scan tool like the ones that the repair shops have you can get the system to do the tests. HTH. -Jim

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