Question about 2003 Chevrolet Silverado 2500HD

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My check engine light starts flashing at 65mph(2003 chevy silverado 2500 6.0) it reads code 300, i have changed my plugs,wires,mass air flow sensor,crank sensor, oxygen sensor,battery, when i tow my 26ft travel trailer it doesnt come on unless im going down hill, no one can figure it out

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The most likely solution is to preform a crank relearn this must be done with a good scan tool such as snap on modis/solus OTC genisis or GM tech 2 a cheap scan tool CAN NOT preform this function. A crank relearn will renew the relationship with the computer and crank position sensor

Posted on Aug 06, 2012

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I have the same problem. I just ignore it.

Posted on Aug 15, 2010

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  • 14 Answers

This is a weird phantom problem. check out this site. http://www.obd-codes.com/p0300

Posted on Apr 08, 2010

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Posted on Jan 02, 2017

leetamara
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SOURCE: having problems with my 96 chevy tahoe mass air flow

The MAF (Mass Air Flow) sensor is a very common problem with these along with the pickups. This isn't what you would call an inexpensive part. Definitely do some shopping before you buy one.

Posted on Nov 10, 2008

Molson02536
  • 3854 Answers

SOURCE: 98 chevy suburban, code reads mass air flow sensor

Check the wire leads and clean them before reconnecting the wire leads. It wouldn't hurt also to clean the MAF sensor with MAF cleaner, the code your getting is most common to the high performance oil base filters like K&N.

Good luck and this should help you resolve your MAF issues. Thank you for using Fixya

Posted on Mar 12, 2010

  • 834 Answers

SOURCE: OK My 03 2500, Silverado pulls a code: PO 101, Mass

The MAF sensor (Mass Air Flow) is located in in the air induction system usually just after the air filter and before the throttle body, and the ECM (Engine Control Module) uses the signal generated from the MAF sensor to determine how much fuel the engine receives. However, before you replace the MAF sensor you should be certain that there are no air or vacuum leaks in the air induction system especially between the throttle body and the MAF sensor, and also that all of the hose clamps are all good and tight on the air induction boot especially between the throttle body and the MAF sensor, and check if the air flow is being restricted from the air cleaner side of the MAF. (check the air filter and check the air intake to the air cleaner for any obstructions that might be restricting the air flow to the MAF)

You can also clean the MAF sensor with carburetor spray because they build up a very fine dust on the air velocity sensors that are mounted on wires that are suspended in the air stream to monitor and determine the amount of air flow into the engine, and when the MAF sensor becomes dirty the MAF sensor will loose performance. Be very careful when cleaning the air velocity sensors inside of the MAF sensor because they are very delicte and are easily damaged, and do not touch them with anything other than the spray from the carburetor can and that is all that is necessary to clean the air velocity sensors. Here are some images that I have put together to assist you.


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Posted on Jun 22, 2010

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1 Answer

99 Chevy Silverado 2500 was running fine last night..got gas last night but got it from the same gas station as always...thismorning idle was realy rough,shaking the whole truck...really struggling for...


Have you changed plugs and plug wires lately. Sounds like misfire, possible ! Should also check fuel pressure , plugged fuel filter or weak fuel pump ! Mass air flow sensor dirty, or map sensor .What engine do you have and does yours have How to replace the spider injector on Cheyv motor 4 3 or 5 7 liter

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2003 Nissan Altima 2.5L Service Engine Soon Light is on, Auto Zone says codes are for MAF and O2 Sensors. Car hard to start after driving a while but when starts appears to run smooth. Auto Zone thi


ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........
  • P0103
    Mass Air Flow Sensor Circuit High Input
  • Possible causes
  • Faulty mass air flow sensor
    - Intake air leaks
    - Dirty mass air flow sensor
    - Dirty mass air filter
    - Mass air flow sensor harness is open or shorted
    - Mass air flow sensor circuit poor electrical connection
  • Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
  • possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
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    - Engine running rough
    - Excessive fuel consumption
    - Excessive smoke
  • the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).
2003 NISSAN Altima Sedan OBDII Codes List

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I have a 2003 Chevy Silverado 4.3 Vortec, while the engine is under a load the check engine light will begin to flash and the truck will run rough for a very short period of time and also if it stores


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1 Answer

Silverado mass air flow sensor


the map sensor could be the problem for code P0101
hope it helps

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2003 chevy 1500 hd engine light flashes temporarily when coasting downhill at highway speeds (ie 65mph or faster). When diagnosed, no error codes present.


Does it feel like it is missing when the light is flashing?If not then all you need to do is have a crankshaft variation learn done.This will take care of this problem.Just had a couple of these at the dealership myself and this took care of the problem.If it is missing then check the ignition system like the plugs,wires,and coils.Also check the intake manifold for vacuum leaks.Hope this helps.Good luck.

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Jan 13, 2011 | 1989 Chevrolet Silverado 2500

1 Answer

Po 101 and 300


To give you a little peace of mind, your engine is fine. I had the same problems with mine, and I totally forgot what they did to it and it was simple. I keep want to think it airmass sensor or throttle sensor its was one of those, they had the parts and seems like it took them 10minutes to replace and I was n and out. code 101 is airmass sensor and 300 is misfire the cause factor is from 101, you cant go faster than 40 to 50 mph even if you have the pedal to the floor..One of the mechanic state having Onstar system play a factor in it. Being electronics parts it may be still cover eventhough is 2003.

Aug 07, 2009 | 2003 Chevrolet Tahoe

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