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Po101

dandy

By dandy
in Ask A GM Technician

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Rog Man Enthusiast

Rog Man

Posted
Posted

I just had that error code and it turned out to be a fouled air flow sensor at the air filter box.

I don't know what GM used too clean it but it's all good now.

I personally think It was a direct result of using a K & N air filter system which has been completely

removed and put back too stock.So hopefully no more error code?

dandy New Member

dandy

Posted
  • Author
Posted
The MAF sensor signal is not within a predetermined range of the calculated value.

 

i've had my 03 sierra for 4 years now and i changed o2 sensors twice.i've been having po402 code for a couple weeks now and i've been clearing them codes thinking it was bad gas or false reading.now yesterday it come up with the po101 and it's dieseling,no power stalling,and also po300

bill190 Enthusiast

bill190

Posted
Posted

Did you have a question?

 

FYI - You can search google.com for trouble codes and what they mean. You can do this by searching for...

 

DTC P0402

 

or

 

Diagnostic Trouble Code P0402

 

Note that the above begins with "P0" and not "Po" or "PO".

 

The first example is the letter P and a Zero (the number). Correct!

The second example is the letter P and a lower case o (the letter).

The third example is the letter P and an upper case O (the letter).

 

It is important when searching the internet to use the correct word, code, term, etc. This could make the difference in finding all sorts of information, or not much information.

 

Then if you want to ask for help on the internet with your vehicle, it is a big help to ask a specific question like "What is causing this problem?", "What should I do to fix this?", "I'm going to take my vehicle to my mechanic and am wondering what the problem could be?", "Is this something I should be concerned with and should I take my vehicle to my mechanic?", etc. (Let us know what you want specifically.)

 

Then also it is a big help to give as much information about your vehicle as possible. Year, model, engine like 5.7L, 4x4 or 2 wheel drive, etc.

 

Example: 1992 GMC Sierra 2500 5.7L SLE Extended Cab 4x4 Long bed

 

Or at least give information about the things on your vehicle you are asking about. Like if asking about engine questions, for example...

 

1992 GMC Sierra 2500 5.7L 4x4

 

(Give the basic model and type of engine. The engine could be 2.5L, 2.8L, 4.3L, 5.0L, 5.7L, or 7.4L) Different engines have different gizmos.

 

Anyway here is a search of google.com for...

Diagnostic Trouble Code P0402

http://www.google.com/search?hl=en&q=D...amp;oq=&aqi=

 

Here is a search of google.com for...

Diagnostic Trouble Code P0300

http://www.google.com/search?hl=en&saf...amp;oq=&aqi=

 

Here is a search of google.com for...

Diagnostic Trouble Code P0101

http://www.google.com/search?hl=en&saf...amp;oq=&aqi=

 

Tip: If you are having a lot of trouble codes and these have to do with the "range" of various sensors, it is a good idea to do a basic check of your electrical system first.

 

Electronic "gizmos" do not like "low voltage". If your battery drops to around 9 volts with the ignition on (not started), then electronic things will begin to have problems.

 

The battery should be 12 something volts with the ignition on (not started), then go up to 13/14 volts after starting. This is when the alternator kicks in and starts charging the battery.

 

If the alternator or charging system fails, then everything runs off the battery. The battey does not get recharged and gets weaker and weaker. This means lower and lower voltage.

 

The engine computer looks at various sensors to be sure they are working correctly. It may expect to see 10 volts from a particular sensor and if the computer saw this, it would know the sensor was working ok. But if the battery is only 9 volts, the most that sensor could send to the computer would be 9 volts! So the computer says "Hey! There is something wrong with this sensor! It is sending information out of the "range" it should be sending!"

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