2002 gmc sierra 1500 p0300

I'll also talk about some of the tests you can perform to find its cause and solution. It's been my experience that the most common cause of a P trouble code is generally a bad intake manifold plenum gasket or a bad lower intake manifold gasket causing a huge vacuum leak.

These intake manifold gasket vacuum leaks, when present, affect more than one cylinder. This causes the fuel injection computer to set a P misfire trouble code. The intake manifold gaskets on the V8 Chevrolet Silverado GMC Sierra are made of rubber plenum and plastic lower manifold and are infamous for failing and causing vacuum leaks. Unfortunately, bad intake manifold gaskets are not the only thing that can cause a P trouble code. Other things that can cause a P trouble code are:.

P -What Does It Mean? All Tutorials: 4. This material may not be reproduced without the author's consent. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle.

Contents of this tutorial:. If this info really saved the day, buy me a beer! Do NOT follow this link or you will be banned from the site!

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Hate Spam.Finding the exact cause of a misfire can sometimes be a challenge that can have you pulling out your hair and spending money on parts that don't solve the problem.

Well, troubleshooting and solving a misfire doesn't have to be hard. Armed with the knowledge of what can cause a misfire, rough idle condition and a specific testing strategy, you can easily find out what component is the one that has failed.

In this article, I'll talk about the most common causes of a misfire and I'll show you a specific diagnostic strategy that'll help you track down and solve the issue. The core symptom of a misfire is rough idle. A misfire will always be caused by a failed component in one of the three basic systems of your vehicle. These are:. Getting down to the bare essentials that the engine, in your vehicle, needs to start and stay running, the engine needs: Air, Fuel and spark. When things are running optimally, each engine cylinder gets its full dose of air, fuel and spark.

It's when one of these three air, fuel or spark are missing from the mix that the engine in your GM pickup, van or SUV starts to misbehave and misfire. A misfire condition that sets a diagnostic trouble code P, P, P, P, P, P, P, P and thus illuminates the check engine light is one that is usually easy to diagnose and repair. Knowing which specific cylinder is the one that's dead or missing, is a time saver! What sucks is that the diagnostic trouble code doesn't tell you what exactly has failed.

That's right, the misfire could be caused by a BAD COP Coil the usual culpritor a bad fuel injector, or low compression in one or several cylinders.

P0300 GMC Sierra

The hard-to-diagnose misfires are usually the ones that set a P Random Misfire Code or ones that don't set a diagnostic trouble code at all. I don't mean to give you the idea that it's all a hopeless matter! Let's turn the page and we'll take a look at what you'll need to do to pinpoint and resolve the issue causing the misfire.

P -What Does It Mean? All Tutorials: 4. This material may not be reproduced without the author's consent. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle.

Page 1 Page 2 Page 3. Contents of this tutorial at a glance:. Applies To:. Buick Vehicles:. Cadillac Vehicles:. Chevrolet Vehicles:.It stands for:.

P : Random Multiple Misfire Detected. It will often be accompanied by codes PP These particular codes also indicate that there is a misfire detected, but they specify the specific cylinder. If you have P and one of these other codes, the cylinder indicated by the cylinder specific codes would be where to start looking for your problem.

P is a general and random misfire code, which means that the code is not going to tell you which cylinder is causing the misfire.

2002 gmc sierra 1500 p0300

Something is causing cylinders to misfire at random, which is a lot less cut and dry than a cylinder specific misfire code. Here are the most common problems that will throw the code.

They are presented somewhat in order from most to least likely to be causing the code:. A lot of the time, P is going to be fixed by something obvious, such as an EGR leak. P is cause for concern and left unfixed can get worse.

Fixing the problem causing the code to fire can save you time and money and keep your GMC from breaking down. GMC Sierra P Definition P is a general and random misfire code, which means that the code is not going to tell you which cylinder is causing the misfire.

2002 gmc sierra 1500 p0300

The vehicle itself may begin to run rough. It depends on how serious the misfire is. Diagnosing low fuel pressure can be tricky. Popular Mechanics : How to find a vacuum leak. Ignition Problems — Bad plug wires if equippedbad coil packs, and spark plugs can cause misfires to occur. If you got a P or something similar with the P, it may be a good idea to check and see if there is any damage or failure from your ignition components.

Cam or Crank Sensors — This one is very unlikely, but it does happen.

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Low Compression — If you have a leaking head gasket, bent valve, cracked head, etc. You should also feel the vehicle is down on power as well. Replacing the spark plugs, coil packs, and plug wires is not typically difficult or costly. Is P a Serious Concern?Play Now. How is the P GMC code repair? Start by checking the "Possible Causes" listed above.

Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes What does this mean? The auto repair labor rates vary widely across the country, and even within the same city. How much do you know about cars? Take the AutoCodes. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM can detect individual cylinder misfire events. Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp MIL will flash when the conditions for catalytic converter damage are present.

GM P0300 – Meaning, Causes, Symptoms, & Fixes

When the ECM detects that one or more specific cylinders are misfiring, the DTC for the respective misfiring cylinder will set, and up to 2 of the corresponding fuel injectors are disabled for a minimum of 30 s. The ECM will then re-enable the fuel injector and, after approximately engine revolutions, will determine if the misfire is still present.

If the misfire is still present, the ECM will disable the fuel injector again repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM. Get Access to Factory Service Manuals. Need more help?

Get the P Gmc code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Repair Importance Level: 3.GM reports that you may find a P random misfire code as well as codes PP The misfires may occur on a single cylinder and may or may not be felt during driving and may be accompanied by a chirp, squeak, squeal or tick noise.

The noise usually occurs at camshaft speed, which is half the speed of the crankshaft. GM states that a worn cam lobe creates a consistent chirp, squeak, squeal, or tick noise at camshaft speed, along with a misfire with trouble codes PP You may or may not feel the misfire. Since the noise and misfires are the result of a worn cam lobe or lifter roller, disabling a fuel injector or performing a static compress test or cylinder leakage will not be conclusive.

Compression and cylinder leakage tests will show acceptable results on all cylinders since the engine is not rotating. Remove the valve covers and use a wooden hammer handle to apply pressure to the rocker arms while the engine is running. Apply pressure to identify which rocker arm is making the noise.

Apply pressure to the push rod side of rocker, valve side of rocker and listen for the noise to stop. If the noise changes or stops while applying pressure, the cam lobe or lifter roller for that cylinder is the most likely cause of the problem.

Disconnect the ignition coils and injectors on one bank of the engine. Then run the engine with the valve cover removed. While running, loosen each rocker arm by a couple of turns and.

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Or, you can remove one rocker, push rod, ignition coil, and fuel injector at a time and run the engine to see if the noise disappears. Measure the cam lobe lift at the push rod side of the rocker arm. The lift will differ from the shop manual specifications due to wear.

But the lift should be similar when compared to other intake and exhaust push rods. The misfiring or ticking cylinder push rod would have less lift than the other cylinders if the cause is a worn lifter roller or worn cam lobe. Using your scan tool, command AFM on with the engine running. That will unlatch the lifters on cylinders 1, 4, 6, and 7. The valves on those cylinder will stop opening.

If the noise goes away when you do this, there is a good chance that the noise is coming from the valvetrain of cylinders 1, 4, 6, or 7, thus isolating the problem to just those cylinder. Next, check the push rods, rockers, or valve springs for those cylinders. However, if the above tests above do not isolate the cause of the noise, it may be necessary to tear down the engine further to visually inspect the lifter rollers and cam lobes for obvious damage, such as flat spots, pits, grooves.

GM warns that it is very easy to overlook a damaged cam lobe when inspecting them through the lifter bores. Just because the lifter rollers are not worn, does not mean that the cam lobes are okay. Both components must be carefully inspected. Clean the VLOM screen if any debris is present.

A sticking valve can cause an engine misfire that may or may not be felt and it may occur consistently or intermittently. The misfire may be temperature sensitive and it may be more apparent during certain operating conditions, such as driving up a grade, cresting a hill, or during hard acceleration.

If the engine misfires continue to increase during aggressive deceleration with engine braking, or if the misfire occurs consistently, a static compression test, running compression test or cylinder leakage test may isolate the sticking valve. But, it is unlikely that any of these tests will isolate the sticking valve if the misfire only occurs while driving at specific conditions. Remove the spark and insert an air chuck into the spark plug hole.

Connect to shop air. Remove the valve spring and valve keepers and wrap a rubber band around the valve keeper grooves to prevent the valve from falling into the cylinder. Release the air pressure from the cylinder and work the valve up and down in the guide while turning the valve degrees.

If you have to use force to tap the valve off of the seat, excessive carbon build up exists, which may be repaired by decarboning the engine.

Refer to the latest version of PIP for decarboning instructions.Play Now. What does this mean? Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. How much do you know about cars? Take the AutoCodes. Tech Notes What does this mean? The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type.

By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM can detect individual cylinder misfire events. Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp MIL will flash when the conditions for catalytic converter damage are present. When the ECM detects that one or more specific cylinders are misfiring, the DTC for the respective misfiring cylinder will set, and up to 2 of the corresponding fuel injectors are disabled for a minimum of 30 s.

The ECM will then re-enable the fuel injector and, after approximately engine revolutions, will determine if the misfire is still present.

If the misfire is still present, the ECM will disable the fuel injector again repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM. Get Access to Factory Service Manuals. Need more help?

2002 gmc sierra 1500 p0300

Get the P Gmc code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Comments Help us improve AutoCodes.

P0300 GMC - Cylinder Misfire Detected Random Cylinders

Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P Gmc code? Have you replaced any parts?There is a heavy focus on European soccer on the site, in particular Premier League and Champions League, but you can also find all the best North American sports leagues.

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