Check Engine Code P1101 - Chevy Malibu Forum: Chevrolet Malibu Forums
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post #1 of 13 (permalink) Old 06-11-2019, 12:52 PM Thread Starter
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Check Engine Code P1101

Recently I started randomly getting this code when my check engine light comes on. It's P1101: Intake Air Flow System Performance.

It comes and goes without me doing anything to it. It started maybe couple days after I changed out the engine air filter. I dont know if it's placed incorrectly or if it's because its missing a screw I dropped. But the way the car handles/feels when I drive doesn't change.

Has anyone else had this code come up? Was it an easy fix or did you have to take it in?
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post #2 of 13 (permalink) Old 06-11-2019, 02:27 PM
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Re: Check Engine Code P1101

Well... the simplest explanation is usually the right one and it sounds like something isn't put back right since you changed the air filter. Open up the air intake and make sure the filter and everything is seated properly and then make sure the air box is closed up tight.

Can you take a picture of the spot where you lost the screw?
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post #3 of 13 (permalink) Old 06-11-2019, 04:44 PM Thread Starter
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Here is the picture of the screw that's missing. Can I get a replacement screw from like Autozone or something?
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post #4 of 13 (permalink) Old 06-11-2019, 06:21 PM
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Re: Check Engine Code P1101

Hmm. I find it really hard to believe that's the cause of your problem, or any issue at all to have missing. In any case, I'm sure you can take one of the remaining screws into any hardware store like Lowes or Home Depot and they can find you a suitable replacement.

Did everything seem fine and fit snug inside the air filter box?
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post #5 of 13 (permalink) Old 06-11-2019, 06:35 PM
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Re: Check Engine Code P1101

I agree. So long as the filter is inserted correctly and the top is lined up and sealed, a single screw would be enough to keep it shut tight enough to prevent any issues.

What you might want to look at, like cp suggests, is whether the filter is installed right. My Gen7 has a little tab sticking off of one side to ensure that it can be inserted only one way. If yours is supposed to have a tab but doesn't, you may have removed it for inspection and/or cleaning and put it back upside-down. If so, any left over debris could be sucked into the MAF or even the engine. If the MAF has been damaged by debris or is being blocked, it might be as simple as removing the debris, or as expensive as replacing the MAF. Fair warning, though: Don't touch the MAF sensor's wire!!! That could break it or cause issues that require it to be replaced. If you intend to clean it, use ONLY a cleaner specifically made for MAF sensors. That ain't no urban legend or myth!


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post #6 of 13 (permalink) Old Yesterday, 05:34 AM
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Re: Check Engine Code P1101

https://www.yourmechanic.com/article...-cheryl-knight

I disagree with the previous posts. I do think that screw can disrupt the seal on the airbox enough to trigger this code, especially if its intermittent. I would also fully inspect the wiring for the MAF sensor (square box with wires) and pickup some MAF cleaner which is available as an aerosol at most automotive stores. As mentioned, DO NOT touch the wire as you will ruin the sensor. Once that is done, be sure the airfilter is fully seated in the bottom enclosure then reinstall the airbox cover correctly with the two tabs at the front of the airbox fully engaged in their slots and tighten all the screws to ensure a completely sealed airbox. If that doesn't fix the issue, I would start looking at replacing the MAF sensor itself.

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post #7 of 13 (permalink) Old Yesterday, 09:25 AM
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Do you have access to a scan tool that can read live data?
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post #8 of 13 (permalink) Old Yesterday, 09:36 AM
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Re: Check Engine Code P1101

There's an easy way to test whether the missing screw is the problem, as well as identify any air leak in general.

Turn on the car and have someone hold the engine at 2500-3000 rpm from the driver's seat. Examine the air intake box and feel with your hand to see if air is being sucked in around the missing screw hole (as well as the hole itself). If not, check if there's air being sucked in anywhere else that looks like it should be sealed. Let us know if you find anything.
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post #9 of 13 (permalink) Old Yesterday, 11:37 AM Thread Starter
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Re: Check Engine Code P1101

I'm gonna give all these a try this weekend and report back. It's been a couple days since the light has came on but doesnt mean it's fixed.

I have a scan tool and I think it does do live reading but I don't know how to read that info.
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post #10 of 13 (permalink) Old Yesterday, 02:42 PM
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Well I’ve done quite a few Malibu’s at my work with this code. Figure out if you can read live data and look for a data pid that says throttle body airflow compensation
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