2001 blazer obdII code P0102

my blazer shows a code p0102,low voltage to circuit,car has no power and does not drive that far without almost stalling,also when in park car wont tach past 2k without stalling-my ques. is this a pcm problem or somethingelse

MAF sensor needs cleaning.

Remove it and spray throttle body cleaner through it on the sensor wires and dissolve the black gunk covering them.

Then reset your computer and start it up.

thanks blazerlt but i already c/o the maf but didnt reset the computer-i also see a problem with the voltage with everything running it hits about 11 or 12 the battery is new as of 12/01 so maybe a problem w/alt?

thanks blazerlt but i already c/o the maf but didnt reset the computer-i also see a problem with the voltage with everything running it hits about 11 or 12 the battery is new as of 12/01 so maybe a problem w/alt?

Alternator needs changing.

What is c/o the MAF mean?

maf=mass air flow sensor located between air filter and thorttlebody

jesus, I know what MAF means, what does C/O mean?

changed out

Replace your alternator.

had alt. checkout at autozone they said it's ok now i have no clue,maybe egr?something w/the fuel sys?

Having your vehicle stall out and the voltage gauge reading low is a tell tale sign of a bad alternator.

Do this, buy a new alternator, install it and if the problem does not go away you can return it. Alternators are very easy to install in about 15 minutes.

I don't trust the alternator test at autozone seeing there has been many that have had it tested there only to find out that their alt is bad even though it tested ok.

It is that or the battery. Take a voltmeter out and test the battery with the engine off and the engine runnign and come back here and tell us the readings.

thanks LT for the info,i just bought the battery at the start of the week,but would the alt have anything to do with not being able to rev up past 2k?and also can anyone tellme how to clear out the computer on a 2001? i'm getting different answers on this problem

You never said it wouldn't rev past 2k. Hmmmm... this kind of information needs to be brought forth in the first place.

Before we move on tell me this, have you checked for anymore engine codes?

yeah i did but anyways i can get 2 codes,a p0102and P0302 random or multiple misfires are it

This might be a defective MAF sensor. That or a broken wire somewhere.

Check you coil out at night with it completely dark and look for blue spark arcing around the coil.

thanks LT I'll try it later

the maf sensor is fine,though i saw some arching around the body of the coil i replaced the coil but still have the same problem,i have only 1 code P0300 random misfire,i did notice the alt is extremly hot to touch and the volts read 11-12 with everything on,i still dont know how to clear the comp

Clear the comp by removing the negative battery cable and removing the ECM fuse from the fuse panel fo 5 minutes or so.

Clears everything for me.

Trace all the wiring go to and from the alt.

I still think the alt is shot for sure and will fail when it is warm. Bench testing it will not show this because they never test it with the temperature it is subjected to in the engine compartment.

no more P0102 code- i c/o the alt and cleaned out the egr-but engine still wont tach past 2 and very little power-i get 2 codes both the same P0300 random or multiple misfires i'm pretty much besides myself on this

Does your exhaust sound rather growly and loud?

Do you smell sulfer?

no,i have pressure coming out at the tail pipe-though i did notice that the throttle body seems to be sucking in alot of air you can really hear it

Check for a vacuum leak.

any ideas as were to start? also should i consider c/o the cap and rotor? the car has only 48k

Maybe check the cap and rotor for white corrosion.

Would be a good start. Also check your fuel pressure and see whether or not the fuel filter has ever been changed.

rotor and cap weren't good so i changed them out i cleared the comp the misfire codes are gonr but that dam p0102 code is back-maybe a bad maf-which i c/o maybe they gave me a bad maf?-i don't have a way to check the fuel pressure so it looks like this car is going to have to see the man!

Fuel pressure check will speak volumes.

Have you ever replaced the fuel filter?

yeah i changed that out only 11$ but what a pain to c/o i'm going to have it towed to a shop that deals in gm's car and trucks,though i did talk to a guy yesterday that said his 2001 went through 3-fuel pumps

Could be the pump or the fuel pressure regulator.

Lots of times the shops replace the pump when it is the regulator causing the problems.

Just keep it in mind.