Chevy LLY Duramax EGR Codes P0401, P0404
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Date: 2020-08-05
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Comments and reviews: 9
dannyo66
Working at Walmart as an Auto Care Technician, I have definitely seen much dirtier air filters in diesels.
Walmart does carry Fram as their filter contractor for air filters, but Fram has 2 levels of filters. 1st is the Fram Extra Guard, their basic filter, and 2nd is the Fram Ultra Synthetic which is their premium air filter.
When I replace filters, if I know it's going out into the oil patch in North Dakota, or seeing a lot of dirt road usage, and if it's a service type rig, like this one, I'll use the Ultra Synthetic. If it's someones town driver, I'll use the Extra Guard. But I will also offer an option and recommend the Ultra Synthetic for it's better filtration characteristics.
Walmart just started carrying the Super Tech line of air filters too, but we went into shutdown with the Auto Care Center due to Covid19 right when we got them, so I haven't had a chance to install any or see how they work compared to Fram.
There are a lot of good air filters out there, stick to a name brand and you'll be fine. (incidentally, AC Delco and Wix/Napa Gold are also good filters, but you never see a comparison between Wix/Napa Gold, K & N, Mobil 1 against a Fram Ultra Synthetic filter. They always compare them to the Fram Extra Guard and poo poo Fram for their inferior filter compared to the other premium branded filters. I wonder why that is)
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Working at Walmart as an Auto Care Technician, I have definitely seen much dirtier air filters in diesels.
Walmart does carry Fram as their filter contractor for air filters, but Fram has 2 levels of filters. 1st is the Fram Extra Guard, their basic filter, and 2nd is the Fram Ultra Synthetic which is their premium air filter.
When I replace filters, if I know it's going out into the oil patch in North Dakota, or seeing a lot of dirt road usage, and if it's a service type rig, like this one, I'll use the Ultra Synthetic. If it's someones town driver, I'll use the Extra Guard. But I will also offer an option and recommend the Ultra Synthetic for it's better filtration characteristics.
Walmart just started carrying the Super Tech line of air filters too, but we went into shutdown with the Auto Care Center due to Covid19 right when we got them, so I haven't had a chance to install any or see how they work compared to Fram.
There are a lot of good air filters out there, stick to a name brand and you'll be fine. (incidentally, AC Delco and Wix/Napa Gold are also good filters, but you never see a comparison between Wix/Napa Gold, K & N, Mobil 1 against a Fram Ultra Synthetic filter. They always compare them to the Fram Extra Guard and poo poo Fram for their inferior filter compared to the other premium branded filters. I wonder why that is)
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Jon
Super helpful Mr. O. Because it was a day off, I did the same procedure on my 04 LLY -no codes and newish filter. Before cleaning I got 24 g/s at 100%, 18 g/s at 30% and 38 g/s at 0. The MAF wires were shinny to begin with after q-tipping I rechecked the numbers which stayed the same, except 39 g/s at 0%. Not really a fix but a learning experience, did not know about the MAF working for the EGR. This is my latest Chevy and first diesel, fortunately it isn't headed for the scrap yard. yet. What HD diesel and year what would you get? Thank you both for the hard work and don't forget to take a vacation now and then!
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Super helpful Mr. O. Because it was a day off, I did the same procedure on my 04 LLY -no codes and newish filter. Before cleaning I got 24 g/s at 100%, 18 g/s at 30% and 38 g/s at 0. The MAF wires were shinny to begin with after q-tipping I rechecked the numbers which stayed the same, except 39 g/s at 0%. Not really a fix but a learning experience, did not know about the MAF working for the EGR. This is my latest Chevy and first diesel, fortunately it isn't headed for the scrap yard. yet. What HD diesel and year what would you get? Thank you both for the hard work and don't forget to take a vacation now and then!
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Kenneth
Eric O. I was always told that youre never supposed to touch the resistor wire in the Mass airflow sensor. I always use CRC Mass airflow sensor cleaner and just spray it directly on the wire. Mine have never been super dirty/black so im not sure how much it really cleaned it. Let me know
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Eric O. I was always told that youre never supposed to touch the resistor wire in the Mass airflow sensor. I always use CRC Mass airflow sensor cleaner and just spray it directly on the wire. Mine have never been super dirty/black so im not sure how much it really cleaned it. Let me know
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Karl
I have a 07 Duramax it has an edge tuner on it! Runs like a streak! Have had no issues other than glow plugs that wear out! Dealers don't like it, but I don't go to dealer to have it worked on! Gets good mileage when not pulling! Blows smoke like they should!
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I have a 07 Duramax it has an edge tuner on it! Runs like a streak! Have had no issues other than glow plugs that wear out! Dealers don't like it, but I don't go to dealer to have it worked on! Gets good mileage when not pulling! Blows smoke like they should!
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Kyle
I have an 05 LLY and mine is showing the same codes, P0404, P0401cranked this morning and ran for 5 seconds and wont start
Changed the air filter and cleaned MAF and still wont crank. Changed the MAF and still nothing. Batteries good
Any suggestions?
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I have an 05 LLY and mine is showing the same codes, P0404, P0401cranked this morning and ran for 5 seconds and wont start
Changed the air filter and cleaned MAF and still wont crank. Changed the MAF and still nothing. Batteries good
Any suggestions?
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Cragified
Electronic Engineer myself and my opinion: If the mass airflow sensor cleaner can't clean it then nothing wrong trying some carb or brake clean. You have to replace it it anyway if you can't get it clean and it's not reporting properly.
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Electronic Engineer myself and my opinion: If the mass airflow sensor cleaner can't clean it then nothing wrong trying some carb or brake clean. You have to replace it it anyway if you can't get it clean and it's not reporting properly.
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mdcorman
watched you short intro and you cap has been thru alot. If that cap ruins I know your going to go thru withdrawls. I know I did On a couple. One I actually fixed sing JB WELD still got it. But hasnt been washed tho.
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watched you short intro and you cap has been thru alot. If that cap ruins I know your going to go thru withdrawls. I know I did On a couple. One I actually fixed sing JB WELD still got it. But hasnt been washed tho.
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Steve
When I did injectors on my CA LB7, I discovered a pinched line near the vacuum pump that had been causing an EGR MIL.
Easy fix.
Does the LLY have the same EGR system (including cooler) as my LB7?
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When I did injectors on my CA LB7, I discovered a pinched line near the vacuum pump that had been causing an EGR MIL.
Easy fix.
Does the LLY have the same EGR system (including cooler) as my LB7?
reply
James
Going through periodic no throttle, black smoke then sudden clear up, until the next episode. No rhyme or reason. Boy do I wish you lived near me. I'd be on your doorstep begging.
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Going through periodic no throttle, black smoke then sudden clear up, until the next episode. No rhyme or reason. Boy do I wish you lived near me. I'd be on your doorstep begging.
reply
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