Question about 2007 GMC Acadia SLE

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P0300 code changed spark plugs

Do you know why appears code P0300

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  • 34 Answers

Random misfire. try cleaning your injectors and make sure to use ac delco plugs with proper gap

Posted on Feb 17, 2014

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Posted on Jan 02, 2017

keithheavili
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SOURCE: Vehicle start shaking and died. Has a trouble code P0300

Error code P0300 means that you are having multiple/random cylinder misfires.  I would start with changing all of the spark plugs and see if that will fix it.  You will have to have the code reset at an auto parts store.  If that doesn't work let me know and we can progress down the line.

Posted on May 18, 2009

dsacco86
  • 1077 Answers

SOURCE: p0300 code still cominng up on my scanner anthe

I don't think it could be the injectors. Because, all of them would have to go bad at the same time to give you code P0300. If one injector when bad on number one cylinder, it would give you a code of P0301 for cylinder #1 misfire. Code P0300 is the computer simply can't determine the specific cylinder of misfire. Basically,

I would look at the EGR system, engine timing, and fuel pressure. One of these should be the source of the problem.

Posted on Oct 08, 2009

  • 225 Answers

SOURCE: Has a random misfire. Found trouble code P0300

look inside the disturbutor cap and see if there is white build up on the points inside the cap. if so change cap rotor plug wire and plug. go from there.

Posted on Aug 14, 2009

roniecon
  • 6826 Answers

SOURCE: 2002 gmc serra 4.3 v6 code p0300 random misfire

Check the oil,smell the oil,to see if there is a gas smell to it,if so,the injector spider,has a broken injector line.The intake will have to be removed to replace the injector.

Posted on Jul 08, 2010

ryanlutton
  • 1121 Answers

SOURCE: 2005 gmc envoy fault code P0300

This is a misfire.....Start with the least expensive thing....First thing to try is change your spark plugs to A/C Delco 41-103's. If this doesn't clear the code, you probably have a bad coil which can cost around $70 each.

Posted on Jan 04, 2011

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My car had engine codes p0300 and p0301 so I changed my spark plugs and my coil 1 now I have codes p0301 & p0304 and I don't know why any help would be greatly appreciated thanks


P0300 is random misfires. Meaning more than one cylinder was misfiring. Year make model and engine size helps. On 4 cylinders 1 and 4 fire at the same time, this would be an ignition module. On a lot of models.

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P0300 Diagnostic Code - Random Misfire Technical Description Random/Multiple Cylinder Misfire Detected What does that mean? 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 Symptoms may include: the engine may be harder to start the engine may stumble / stumble, and/or hesitate other symptoms may also be present Causes 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 fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking 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. It is helpful to have access to a factory service manual and an advanced scan tool to properly diagnose a random misfire DTC. P0300 Diagnostics Video Here is a helpful video that may assist you in learning more, diagnosing, and repairing your P0300 DTC. This video is intended for auto repair professionals but could be helpful to DIYers. It shows use of an advanced OBD-II scan tool during diagnostic steps:

Read more at: http://www.obd-codes.com/p0300
Copyright © OBD-Codes.com Autolite Challenge Series P0300 Engine Misfire Diagnosis

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DTC P0300: Random multiple misfire detected. Probable cause:
1. Vacuum leaks, damaged hoses and/or incorrect routing
2. Fuel contamination
3. Ignition system fault. Check ignition module, coil, spark plugs and wires
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I have a 2005 Nissan Sentra 1.8L Special Edition and I'm having trouble starting the car. The check engine light came up and got a troubled code P0300. I have recently changed the spark plug, MAF sensor...


DTC P0300: Random multiple misfire detected. Probable cause:
1, Vacuum leaks. Damaged hoses or incorrect routing
2. Fuel contamination
3. Ignition system problem. Check ignition module, coil, spark plugs and wires
4. Fuel system problem

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1 Answer

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A P0300 code indicates random, multiple misfires were detected. You eliminated the possibility of ignition system faults by replacing the ignition module, the coils, and the spark plugs (unless the replacement part(s) were no good). However you did not mention the ignition wires which are another probable cause. In addition, there could be vacuum leaks due to damaged hoses or improper routing. Consider also fuel contamination or a problem with the fuel system.

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1 Answer

Vehicle start shaking and died. Has a trouble code P0300


Error code P0300 means that you are having multiple/random cylinder misfires.  I would start with changing all of the spark plugs and see if that will fix it.  You will have to have the code reset at an auto parts store.  If that doesn't work let me know and we can progress down the line.

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