Code P0101

[twostrokeking13]

Hey all! I have a 2005 Silverado 1500 with the 5.3L. It’s been a great truck. Recently I had the truck tuned by diablew and it ran amazing. This was in August. At the beginning of December the truck threw a check engine light for p0101 mass air flow. I went to autozone for a quick fix and replaced the mass air flow. It was fine until last week.. it threw the same code again so I warrantied out the mass air flow. The next day the code was back. I have checked everything i can think of and my LTFT are at around -17. Yesterday I downloaded the stock tune and that improved the LTFT to -10 ish but they never go positive. Check engine light came on again. I reached out to Lew and he said it’s the MAF. I will be going to the dealer tomorrow to get an OEM MAF unless anyone has any ideas. Thank you!

 

 

Sent from my iPhone using Tapatalk

[riverbanks]

Yep,duralast and our trucks don't mix well

[CadillacLuke24]

True that! Duralast and anything generally doesn't mix well

 

Some of the old timers on the Cadillac Forum I'm on call them Don'tLast

[greatmizzou]

Probably an intake manifold leak, unless you’ve been running oiled air filters and have a physical leak in the intake shroud

 

Ive neglected this for a while because it’s a minor leak that only shows when towing, but gotta get it done at some point

 

from what I understand you have unmetered air getting into the engine and that is what’s throwing the code.  That old of an engine surely has some type of manifold leak

[riverbanks]

Double check the post about fuel trim,he's in the minus

[sefiroxx]

Negative ft is an indicator that the pcm is trying to lean out the fuel. It's a sign of:
- MAF reporting more air than actual
- injector stuck open
- stuck in Open loop (cold start)