Codes P0101 and P0102

Tiny
BARRY.DOWLER
  • MEMBER
  • 2009 GMC SIERRA
  • 6.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
Truck listed above is a SLE Duramax 6.6 diesel crew cab.
The truck P0101 and P0102 codes most often is P0102 code but there have been others. This generally occurs after the truck has reached operating temperature.
It usually does not occur until a truck is at least 200°according to temp gauge in the dash.
When the code is generated, the truck immediately goes into limp mode which I can reset with my scanner, but the code will be regenerated almost immediately forcing it back in limp mode.
The TCM failed about two months ago and was replaced with one from dan's diesel service more details can be found about this online if needed.
That fixed all the TCM related errors. Now I am just left with this one.
The air filter is relatively new, less than five thousand miles on it. The MAF Sensor has been replaced and it has also been tested and meets all of the normal parameters for a normally good Sensor.

The five wires plug the goes to the sensor has been tested and all connection contacts have the appropriate voltages on them. The sensor indicates about 2.32 KHZ alerts at idle measured.

With the frequency meter I do not have a scope so I cannot tell you if waveform is a is exactly a square wave or not as per the Manufacturing Service Manuel.
There are no obvious air leaks anywhere that I can see or hear. Although I have not specifically tested for air leaks with any special tools.
The truck is basically stock with the exception of some MaxTow gauge Packs and Amsoil bypass oil filter system that I have installed. Which should not affect this.
This has me stumped any help would be greatly appreciated.
thank you
Friday, December 17th, 2021 AT 1:46 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Hi,

You indicated 2.32 HTZ at idle. My manual is indicating 2,300 at idle. Please confirm. Also, an EGR that is not fully closing can cause the 102 code. Have you checked that as well? Also, have you confirmed the air intake duct isn't collapsed or damaged?

At this point, if the above things have been checked and are in good condition, you really need to check for vacuum leaks which can be the issue causing both codes.

Additionally, the intake air temperature sensor is built into the MAF. However, there is an IAT 2 sensor on the intake. Have you checked both?

Let me know. Additionally, pics 1 and 2 show the locations of both IAT sensors. The remaining is a technical service bulletin related to the P0101. Both codes you have are tied together causing the same result (reduced power).

Let me know what you find.

Joe

See pics below.
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Friday, December 17th, 2021 AT 6:35 PM
Tiny
BARRY.DOWLER
  • MEMBER
  • 2 POSTS
Thank you so much for your reply. I will do the tasks you have directed and get back to you. It might take a couple of days. I got a ton on my plate right now. Thanks again
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Monday, December 20th, 2021 AT 12:11 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Hi,

You are very welcome. Let me know what you find when you get to it.

Take care of yourself,

Joe
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Monday, December 20th, 2021 AT 6:19 PM

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