I started getting the P0496 code on my 2016 Impala LT about three weeks ago. I decided to change the purge valve and reset the code, and the check engine light stayed off until yesterday. Now the same issue has come back. I disconnected the vacuum line and electrical line from the purge valve and tested for vacuum suction, and I could definitely feel the suction. So, if changing the purge valve didn’t fix the issue, what could be the actual cause and how can I go about fixing it?
Sounds like it needs a proper diagnosis. Typically, a purge valve is almost always the culprit for this code in your vehicle. It is pretty common.
Sam said:
Sounds like it needs a proper diagnosis. Typically, a purge valve is almost always the culprit for this code in your vehicle. It is pretty common.
Gotcha, thanks for that info. I guess I’ll have to keep digging into it.
@Zia
That’s a good tip. I’ll see if I can look into the warranty and check the link you provided.
If you’re feeling suction when the electrical connector is off, you might want to just replace the purge valve again. It could be a faulty part.
Ari said:
If you’re feeling suction when the electrical connector is off, you might want to just replace the purge valve again. It could be a faulty part.
Yeah, replacing it again might be an option. It’s frustrating for sure.
Keep in mind you have two types of purge valve solenoids in your system. One is the vent valve solenoid and the other is the cannister vent valve solenoid. If the purge valve isn’t the issue, then the other one might be causing the problem.
@ELLY
Thanks for the clarification. I’ll have to look at both solenoids to get to the root of the problem.
Also check your vacuum lines for leaks. If there’s a leak, that could trigger the P0496 code even if the valve itself is fine.
Jessie said:
Also check your vacuum lines for leaks. If there’s a leak, that could trigger the P0496 code even if the valve itself is fine.
Good idea, I’ll inspect the vacuum lines as well to make sure there are no leaks.