P0101 MAF Code After Installing Air Intake / Duramax Hood

stoltz423 · February 16

Back in 2021 I had a tree fall on my garage and did some minor damage to my 2017 Denali. Hood was going to be replaced so I opted for the Duramax hood. When I purchased the parts I ordered everything needed for the hood and ductwork under the hood except for the air filter box.

Fast forward to the end of last year and I decide it's time to make the hood functional. I purchased a duramax air box out of a junk yard and a open box rough country cold air kit really just for the pipe and fittings. Install came out as I planned. I reused the original 1500 MAF sensor. Truck sounded great but it would throw a P0101 MAF error. I could reset this and it seemed like when I put the pedal to the floor is when it would throw the code within the first 40 miles or so. After resetting this a few times I put the intake setup back to stock and the code hasn't come back. I suspect that the amount of air the sensor is seeing is beyond the sensors max air flow limit?

Any ideas if there is a way to make this work and not have the CEL. I do have the MAF sensor from the Duramax but I was hesitant to try that as I didn't want to create any additional issues.

Edited February 16 by stoltz423

asilverblazer · February 16

1 hour ago, stoltz423 said:

...and a open box rough country cold air kit really just for the pipe and fittings...

I would try putting the factory intake tube (between MAF and throttle body) back on. Compare to service recommendations below when this code occurs on factory vehicles.

The engine control module (ECM) detects that the actual measured air flow from the MAF, MAP, and throttle position sensors is not within range of the calculated air flow that is derived from the system of models for greater than 2 s.

Verify the integrity of the entire air induction system by verifying that none of the conditions listed below exist:
- Any damaged components
- Improperly installed components
- Collapsed, restricted, or damaged components
- Loose clamps, cracks, or other damage
- An air flow restriction
- Restricted air filter
- Splits, kinks, leaks, or improper connections at the vacuum hoses
- Vacuum leaks at the intake manifold, MAP sensor, and throttle body
- Water intrusion
- Any snow or ice buildup, in cold climates
- Contamination of the multifunction intake air sensor element

If you find no mechanical issues, I think a competent tuner should be able to resolve the problem.

CamGTP · February 16

My thoughts too, if that duramax intake tube size isn't the same size as the factory 5.3/6.2 intake size, then that will be a problem on a stock calibration.