Chevy Tahoe p0443

[Timdenn180]

Help!! 2009 tahoe giving p0443 code replaced Evap purge solenoid. Replaced Evap vent valve. Code still Kees coming back. Seems to run fine just hard time pumping gas. What is causing the code?

 

[NardDog]

Sounds like the charcoal canister could possibly have gas in it.

 

[Timdenn180]

Sounds like the charcoal canister could possibly have gas in it.

Okay would that give the coad p0443? I’ll change that next

 

[NardDog]

Okay would that give the coad p0443? I’ll change that next

The parts all work together to form the evap system. So if one part is malfunctioning the others parts can’t function as intended. Last time I was in your shoes with my 02 burb I replaced all the main components, including the vapor canister that was twenty years old. I wanted to start fresh and that has fixed my issue ever since. Some would say I wasted my money parts swapping since my vapor canister was dry when ai pulled it but I had already replaced the purge and vent solenoids so In MY case it was the canister. Hope this helps. Sometimes evap systems can be tricky especially if your problem is in the gas tank. You should let others chime in and get more advice as well.

 

[Timdenn180]

Thanks hoping others do Chime in as well. I have the canister just have t had time to change it

 

[MWD_CTSV]

If you have trouble filling the tank, it is most likely related to the vent path being blocked. Since the canister is designed to collect the vapors when venting, it is a mandatory pass through. Since the filtering media inside the canister often fails, meaning it doesn't work well for venting out or purging in, that is the mostly likely issue if the valves are working (new or known good).

I think the gas cap not sealing may also set 443, but it wouldn't cause problems during fillup.

 

[Timdenn180]

Appreciate all the help. Would like to add that when I first bought the Tahoe it would stall and have hard starting after getting gas but the last 4 trips to the station it is done fine. Not sure

 

[Timdenn180]

Appreciate all the help. Would like to add that when I first bought the Tahoe it would stall and have hard starting after getting gas but the last 4 trips to the station it is done fine. Not sure

Okay so I have changed that Evap canister as well and fills up just fine now. The check engine light 0443 has came back tho. I don’t have and systems of there being anything wrong anymore just the code. New canister purge valve and fl vent solenoid. What now ?

 

[Fless]

The purge solenoid is on the engine (not to be confused with the canister vent valve/solenoid in the rear of the truck).

 

[Timdenn180]

The purge solenoid is on the engine (not to be confused with the canister vent valve/solenoid in the rear of the truck).

Yes I know that is the first thing that was changed. Still have 443 code

 

[Fless]

You'll likely need to do some further testing with a bi-directional scanner that can look deep at some live data and run some tests. The purge solenoid circuit might have an issue.

 

[Timdenn180]

You'll likely need to do some further testing with a bi-directional scanner that can look deep at some live data and run some tests. The purge solenoid circuit might have an issue.

Any idea if there’s a fuse for the Evap purge solenoid?

 

[Fless]

Any idea if there’s a fuse for the Evap purge solenoid?

No, the PCM controls it.

 

[Timdenn180]

No, the PCM controls it.

Okay when I changed the canister it was clearly bad charcoal beads fell out. I attempted to blow the lines out best I could I only seen beads in the line going to the gas tank nothing came out the line going to the purge valve.

 

[Timdenn180]

Okay when I changed the canister it was clearly bad charcoal beads fell out. I attempted to blow the lines out best I could I only seen beads in the line going to the gas tank nothing came out the line going to the purge valve.

Okay so I blew out the line going from the purge solenoid to the Evap canister now I’m getting new codes fuel system too rich bank 1 and fuel system too rich bank 2 along with the original code p0443. What did I do???

 

[Timdenn180]

I am just stumped. Changed all the Evap parts and still have the p0443 code it won’t go away

 

[Geotrash]

I am just stumped. Changed all the Evap parts and still have the p0443 code it won’t go away

Check the wiring to the evaporator purge solenoid in the engine compartment for any damage and that the connector is tight.

 

[Fless]

Are you clearing the code with a scanner and it's coming back?

Or it doesn't go away on its own? If this, it can take several drive cycles to clear.

 

[Timdenn180]

No I’m clearing the code. And keeps coming back just the p0443

 

[ArangusMaximus]

No I’m clearing the code. And keeps coming back just the p0443

Hello, I was reading your thread as I am now having the same issue as you have described on my 09 Tahoe. Did you ever find the root cause/part?