P0446
04-27-2021 | 07:21 AM
#1
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New Member
Joined: 02-16-2021
Posts: 22
From: New York
P0446
Don. You stated that Mitchell does not list P0455 but the OP, GIJOE1980 said his code was P0445
Not sure if the OP misprinted or his reader was in error.
Anyhow. Pulled this short list from one of ChevyMgr's old threads.(no P0445 here)
P0420 Catalyst System Low Efficiency
P0442 Evaporative Emissions (EVAP) System Small Leak Detected
P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit
P0446 Evaporative Emissions (EVAP) Vent System Performance
P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
P0450 Fuel Tank Pressure (FTP) Sensor Circuit
P0451 Fuel Tank Pressure (FTP) Sensor Performance
P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage
P0453 Fuel Tank Pressure (FTP) Sensor Circuit High Voltage
P0454 Fuel Tank Pressure (FTP) Sensor Circuit Intermittent
P0455 Evaporative Emission (EVAP) System Large Leak
P0458 Evaporative Emission (EVAP) Purge Solenoid Control Circuit Low Voltage
P0459 Evaporative Emission (EVAP) Purge Solenoid Control Circuit High Voltage
Not sure if the OP misprinted or his reader was in error.
Anyhow. Pulled this short list from one of ChevyMgr's old threads.(no P0445 here)
P0420 Catalyst System Low Efficiency
P0442 Evaporative Emissions (EVAP) System Small Leak Detected
P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit
P0446 Evaporative Emissions (EVAP) Vent System Performance
P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
P0450 Fuel Tank Pressure (FTP) Sensor Circuit
P0451 Fuel Tank Pressure (FTP) Sensor Performance
P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage
P0453 Fuel Tank Pressure (FTP) Sensor Circuit High Voltage
P0454 Fuel Tank Pressure (FTP) Sensor Circuit Intermittent
P0455 Evaporative Emission (EVAP) System Large Leak
P0458 Evaporative Emission (EVAP) Purge Solenoid Control Circuit Low Voltage
P0459 Evaporative Emission (EVAP) Purge Solenoid Control Circuit High Voltage
I've replace the front solenoid under the hood and also the rear purge valve to no avail. Light is still on. And ideas? Oh also since owning this car and that light being on I can't fill gas into it without the pump shutting off every couple seconds. I have to go in slow half depressed pump lever. Thanks in advance guys
04-27-2021 | 08:03 AM
#4
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Joined: 02-16-2021
Posts: 22
From: New York
More info
Also I don't know if it matters much, but the 3 bolts rusted/ broke off at the cat to tail pipe. So I replaced gasket there and the holes where bolts connect the cat to pipe was rusted/worn/ no existing. So I got 1 of them make your own flange and put it on either side to close them 2 sections together with new gasket. Quieter like new the first month but now has a lil Leake of exaust from there and some noise not to bad.
04-27-2021 | 08:19 AM
#5
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Joined: 10-13-2011
Posts: 37,829
From: Welland,Ont Canada
Oh, the OP was talking about P0443, that’s the confusion.
P0446 as we see in this description is related to the purge vent valve, a short or wiring problem
https://www.obd-codes.com/p0446
I recommend you test the connector at the purge vent valve , if you recently replaced it what part number did you use? As some replacement valves require a pigtail for the under car valve.
I’ve also had issues with the under hood valve failing, if you can blow air through it , it’s no good.
I see you have a 2011, so if the exhaust flange bolts were rusted , then you might need to remove the exhaust manifold and replace the studs , and the gasket.
is the flex pipe rusted thru also?
P0446 as we see in this description is related to the purge vent valve, a short or wiring problem
https://www.obd-codes.com/p0446
I recommend you test the connector at the purge vent valve , if you recently replaced it what part number did you use? As some replacement valves require a pigtail for the under car valve.
I’ve also had issues with the under hood valve failing, if you can blow air through it , it’s no good.
I see you have a 2011, so if the exhaust flange bolts were rusted , then you might need to remove the exhaust manifold and replace the studs , and the gasket.
is the flex pipe rusted thru also?
