Question about 2002 Chevrolet Silverado 2500HD

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2002 chevy 2500hd6.0 ses light flashes at 40 mph an gose out at 75mph p0300 new plugs an wires

Just changed plugs an wires

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They are known for the 02 sensors going bad. you will need to have the computer scanned to see for sure.

Posted on Dec 06, 2012

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Posted on Jan 02, 2017

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SOURCE: Chevy truck '02 surges between 45 and 55 mph

you should change the tps( throtal position sensor) this can cause that problem

Posted on Aug 15, 2009

  • 1 Answer

SOURCE: 2005 chevy aveo dtc P0300 and Hold light flash

Aveos had a service bullatin for some 04 and 05 models. Bad valves, had to have head reworked and solved problem. took car to 3 chevy dealers to find problem..

Posted on Feb 25, 2010

  • 280 Answers

SOURCE: i'm getting trouble code p0300 (random / multiple

Well, I've seen .060 and .035 on Chevies before, but not .040. Call Auto Zone. Tell them what year, make, model, and engine you have. If they tell you it is .040 then I am lost.

Posted on Mar 23, 2010

jgwhomeequip
  • 1902 Answers

SOURCE: I have a 2002 Chevy

Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present

A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel2_bing.gif injector(s)
  • Burned exhaust valve
  • Faulty catalytic convertor(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

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Posted on May 27, 2010

em1cl
  • 463 Answers

SOURCE: CODE P0300 SHOWS UP AND

You may want to check the MAF, ( mass airflow sensor ), they are a very common problem with the issues you are having.

Posted on Jan 31, 2011

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http://www.obd-codes.com/p0102 Code P0300 Causes and Fixes Code p0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as p0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order. It is generally the forward most cylinder on the engine.). If these engine codes are present as well the you should diagnose those first as they are probably causing code p0300.
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