Chevy Impala: Check Engine Light Codes: P0446, P0451 EVAP Trouble
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Date: 2020-08-05
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Comments and reviews: 9
Stanley
Just rewatched this because a 2006 Impala came in to my shop Parking lot with the same Evap Code Advance had pulled a PO496 too but when it got to me it wasn't there and it also had a Fuel Trim limit reached. I checked the Purge and Vent with the Purge and Seal car chugged but tank sensor never changed it was fixed at 12. 66 mmhg and 0. 22 volts. Dropped the tank unplugged the sensor went to zero plugged the new one and it went to 1. 49 volts. Ran the purge and seal again and all was well. I also gotta plug Eric's video on Malibu runs like poo this Impala also had -18% on Long Term the Alcohol Content was at 22% reset the Fuel Composition and the Impala runs great. Eric You the man Thanks again!
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Just rewatched this because a 2006 Impala came in to my shop Parking lot with the same Evap Code Advance had pulled a PO496 too but when it got to me it wasn't there and it also had a Fuel Trim limit reached. I checked the Purge and Vent with the Purge and Seal car chugged but tank sensor never changed it was fixed at 12. 66 mmhg and 0. 22 volts. Dropped the tank unplugged the sensor went to zero plugged the new one and it went to 1. 49 volts. Ran the purge and seal again and all was well. I also gotta plug Eric's video on Malibu runs like poo this Impala also had -18% on Long Term the Alcohol Content was at 22% reset the Fuel Composition and the Impala runs great. Eric You the man Thanks again!
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SoundGuyDave
So, DTC 451 and a faulty Fuel Tank Pressure sensor, caused a related DTC 446? But, there was no issue with the Vent Solenoid? Is that correct? I'm looking into a 2012 Malibu 3. 6L with these DTC's: P0171, P0174 and P0446. One key piece of info my friend told me is the car is difficult to start, AFTER refueling to Full. That to me leads me to believe it's a faulty solenoid [i. e. vapors are being pushed into the engine, undesired, during a refuel, thereby choking the engine]. Am I on the right track? southmainautorepair
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So, DTC 451 and a faulty Fuel Tank Pressure sensor, caused a related DTC 446? But, there was no issue with the Vent Solenoid? Is that correct? I'm looking into a 2012 Malibu 3. 6L with these DTC's: P0171, P0174 and P0446. One key piece of info my friend told me is the car is difficult to start, AFTER refueling to Full. That to me leads me to believe it's a faulty solenoid [i. e. vapors are being pushed into the engine, undesired, during a refuel, thereby choking the engine]. Am I on the right track? southmainautorepair
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Carlos
Hey bud I have a 2013 chevy impala lt my check engine light stays on all the time it tells me I have a leak in my vent silinoy I hope I spelled that correctly I bought it replaced it didn't fix the problem put in a new charcoal canister that didn't do it replaced purge valve didn't do the job I spent a lot of money I thinking if it's this part you just fixed the presser gas senser my car won't start any more with the remote can you help?
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Hey bud I have a 2013 chevy impala lt my check engine light stays on all the time it tells me I have a leak in my vent silinoy I hope I spelled that correctly I bought it replaced it didn't fix the problem put in a new charcoal canister that didn't do it replaced purge valve didn't do the job I spent a lot of money I thinking if it's this part you just fixed the presser gas senser my car won't start any more with the remote can you help?
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DNALI
had the P0446 on my Pontiac Montana. Didn't have any of the tools to diagnose the problem but thanks to this video and the one you did on the pickup truck for the same code I took a chance and replace the sensor with a wells sensor and it cured my check engine light. I did have to drop the tank which wasn't an issue but was able just to reach up and switch the sensor all by feel. Thanks for the great DIYs
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had the P0446 on my Pontiac Montana. Didn't have any of the tools to diagnose the problem but thanks to this video and the one you did on the pickup truck for the same code I took a chance and replace the sensor with a wells sensor and it cured my check engine light. I did have to drop the tank which wasn't an issue but was able just to reach up and switch the sensor all by feel. Thanks for the great DIYs
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Jack
Eric; For verifying the operation and accuracy of a gas tank pressure transmitter have you considered making up a filler cap with a pressure connection? This could then be connected to a low range pressure gauge or a manometer which would verify the operation and or accuracy of the pressure transmitter, as well using this same connection you could increase or decrease the tank pressure for further testing.
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Eric; For verifying the operation and accuracy of a gas tank pressure transmitter have you considered making up a filler cap with a pressure connection? This could then be connected to a low range pressure gauge or a manometer which would verify the operation and or accuracy of the pressure transmitter, as well using this same connection you could increase or decrease the tank pressure for further testing.
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digitalrailroader
this diagnosis may explain the issue with my 2010 Aveo; because its throwing the same two codes. (I plugged in my VCXNano with my Tech2Win software, and saw that my FTP readings are even more wigged out than this Impala at -8. 64 inches of water, at 3. 4V) unlike this Impala, GM Korea was gracious enough to provide me an access panel to my fuel pump underneath the rear seat.
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this diagnosis may explain the issue with my 2010 Aveo; because its throwing the same two codes. (I plugged in my VCXNano with my Tech2Win software, and saw that my FTP readings are even more wigged out than this Impala at -8. 64 inches of water, at 3. 4V) unlike this Impala, GM Korea was gracious enough to provide me an access panel to my fuel pump underneath the rear seat.
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adam0U812
Your videos are informative and easy to understand.
But do yourself a favor and throw out that wooden ladder and get a Werner or something comparable.
Your wooden ladder is outdated and dangerous.
I seen a guy fall off one not 3weeks ago.
If you can afford that scanner, you can afford a decent ladder.
Stay safe, your videos are great.
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Your videos are informative and easy to understand.
But do yourself a favor and throw out that wooden ladder and get a Werner or something comparable.
Your wooden ladder is outdated and dangerous.
I seen a guy fall off one not 3weeks ago.
If you can afford that scanner, you can afford a decent ladder.
Stay safe, your videos are great.
reply
The
I had a evap solenoid go bad now if i were working on one Id buy or rent a vacuum pump to check the solenoid u can troubleshoot the solenoid to see if its the problem or its a leak in line between solenoid and intake the hoses tend to leak causing this code too. If the solenoid is leaking this issue can happen too thats what the vacuum pumpp will test.
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I had a evap solenoid go bad now if i were working on one Id buy or rent a vacuum pump to check the solenoid u can troubleshoot the solenoid to see if its the problem or its a leak in line between solenoid and intake the hoses tend to leak causing this code too. If the solenoid is leaking this issue can happen too thats what the vacuum pumpp will test.
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Brian
Great info Eric. Thought your video on EVAP was my life saver, but something else is going on. 2007 Impala throwing P0172(Rich bank 1, but the only monitors not finishing are EVAP. Short term -3. 1%------Long term -21. 1%. EVAP purge 0%. Alcohol fuel 50. 2%. All o2's check out. Do you make house calls? LOL What gives?
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Great info Eric. Thought your video on EVAP was my life saver, but something else is going on. 2007 Impala throwing P0172(Rich bank 1, but the only monitors not finishing are EVAP. Short term -3. 1%------Long term -21. 1%. EVAP purge 0%. Alcohol fuel 50. 2%. All o2's check out. Do you make house calls? LOL What gives?
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