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Error code P0300 indicates a violation of the ignition order , which stands for random multiple misfires of the cylinders ; in English, the diagnostic tool displays: “Random cylinder misfire detection system.” If a misfire is detected in a specific cylinder, then the last digit “P030x” will change to 1, 2, 3, 4 and so on up to 6 or even 12, depending on which particular “pot” the misfire is in. So error P0300 is derived from errors such as P0301, P0302, P0303, P0304. Most often they occur due to a lack of spark, a fuel supply failure or problems with the exhaust gases.
Let's look at the list of possible causes of misfires, why error p0301, error p0302, error p0303, error p0304 or others of this kind appears, the consequences and methods of elimination, in more detail.
Consequences of error P0300
If a misfire occurs in the engine in the exhaust pipe the level of exhaust gas toxicity increases , which, in turn, can also lead to an increase in the temperature in the catalyst, which causes its damage (the honeycombs melt because the temperature exceeds the threshold of 800 °C ). On some cars, in order to reduce the burnout of fuel in the catalytic converter and, consequently, the level of toxicity, the ECM unit monitors the frequency of misfires using crankshaft and camshaft sensors and, in addition, it registers error p0300, signaling a checkengine light can also , in which the gap was discovered. It is worth mentioning that most often, for some reason, the owners of cars such as Lacetti, Matiz, Priora and other injection VAZs, as well as Opel, Nissan, Kia cars, are interested in the reasons for the occurrence of this error.
What does P0302 mean?
In most cars the engine has 4-6 cylinders. The spark plug fires sequentially in each cylinder. The spark plugs are located at the top of each cylinder. The spark plug ignites the air-fuel mixture, releasing energy.
The energy released when the fuel burns drives the crankshaft, which must rotate smoothly as the vehicle moves. All cylinders work together to ensure continuous rotation of the crankshaft.
If a cylinder misfires, it will cause the crankshaft speed (RPM) to increase or decrease. If the crankshaft speed increases or decreases by 2 percent or more, P0302 will remain in the PCM (automatic transmission control module) memory.
If the RPM increases or decreases by 2 to 10 percent, the Check Engine Light will illuminate on your vehicle's dashboard. If the deviation percentage exceeds 10 percent, the Check Engine light will flash, indicating a more serious problem is present. Trouble code P0302 indicates that cylinder 2 is misfiring.
When does error code P0300 pop up?
Note that error code P0300 is recorded by the control unit only when misfires are detected in several cylinders simultaneously , since a misfire in one of them is recorded after two repetitions in a row, and the rotation speed of the CV is important. At idle, the error is stored in memory after 3.5 minutes of engine operation, and at speeds above 2 thousand - a little more than one minute. threshold for registering a DTC in the ECM memory is more than 3.25% of missed flashes per 1000 revolutions. If misfires are detected only in a certain cylinder, then not error P0300 is generated, but another one, with the serial number of the combustion chamber of the internal combustion engine.
How to Troubleshoot or Reset Trouble Code P0301
Some suggested steps to troubleshoot and fix error code P0301:
- Use an OBD scanner to make sure there are no other errors. If they are present, it is recommended to eliminate them first.
- Inspect the looseness of the connectors on the ignition coils or any damage to the wiring. Also look for loose engine ground wires. This may cause random misfires. Tighten or correct if necessary.
- Check the condition of the spark plugs and their wires. Worn and old spark plug wires are common causes of random misfires. Replace spark plugs and wires if necessary.
- It is necessary to measure the fuel pressure. Low pressure can cause intermittent misfire in multiple cylinders. When the pressure is below specification, the engine does not receive the proper amount of fuel and begins to lean the mixture. The fuel pump or pressure regulator may be the source of low pressure.
- Make sure the fuel injectors are working properly and activating. Random misfires may be a sign of faulty or clogged fuel injectors that need to be replaced. Also check that the fuel injector wiring is not damaged and is connected correctly.
- If the ignition and fuel system pass inspection, you can perform an engine compression test and a leak test to see if there are any mechanical problems causing the misfire.
Error p0300, p0301, p0302, p0303 and p0304 causes
Unfortunately, the diagnostic tool has not learned to determine the specific cause of the failure and, in this case, misfire in the engine cylinder, but, fortunately, the most likely malfunctions can develop in two directions - either there is nothing to burn , or it is impossible to ignite . Although it is still too early to rejoice at the possible quick search for the cause of error p0300, since it could be:
Cylinder misfires. How to diagnose the cause.
- In the ignition system
- spark plug failure;
- breakdown of a high-voltage wire;
- faulty ignition coil (or module);
- other reasons related to wiring and connectors in the ignition system.
- In the power system
- poor quality fuel;
- clogged injectors;
- heavily contaminated fuel filter;
- low fuel pressure.
The main reasons why error P0300 occurs
Technical description and interpretation of error P0302
The OBD II error code P0302 is a generic one that reads “Cylinder #2 misfire detected.” Set when the PCM (powertrain control module) detects a misfire in the second cylinder.
The misfire detection system uses input data that is sent to the PCM through dedicated feedback circuits. If the PCM does not receive feedback, it interprets this as a misfire.
Trouble code P0302 indicates that the second cylinder is misfiring. They occur when insufficient fuel is burned in the cylinder. Efficient combustion of fuel is important. Because fuel combustion is the source of energy for engine operation.
Misfires can be caused by many reasons. Due to a faulty ignition system, fuel system or internal engine failure. Often the fault occurs due to worn spark plugs, spark plug wires or a faulty coil.
Recommendations for checking and troubleshooting
The first thing you should check when misfiring is the explosive wires and ignition coils (module), they often turn out to have broken insulation, a break, or an oily surface. We measure the wires with a multimeter (normal resistance is about 4 - 10 kOhm), in resistance mode, but to check individual ignition coils, you just need to swap places with a known working cylinder and clear the errors again. If the code has changed to the number of another cylinder, then the coil is faulty. The ignition module is more complicated; it needs to be checked with a tester.
Errors p0300, p0301, p0302: failure in the ignition system for the car
Misfire is a real problem for motorists. The car begins to jerk and stall, the engine does not start in unfavorable conditions (for example, in the cold), while driving, characteristic loud pops are heard from the exhaust pipe. This happens because the combustible mixture accumulates in the idle cylinder, but there is no normal outlet for it. The loss of power is noticeable, at least 25%.
Causes of multiple misfires
Signs of misfire: the engine throttles, power decreases, fuel consumption increases. Uneven operation is clearly noticeable on 3, 4, 5-cylinder engines, but on V-shaped 6 and 8-cylinder internal combustion engines, it is more difficult to notice the shutdown of one of the cylinders.
Error codes
Self-diagnosis of a modern injection system is capable of recording misfires and determining which cylinder is the cause of uneven engine operation. Therefore, we recommend starting with diagnosing the current fault codes. When searching for the cause of a breakdown, it is important to understand in which particular engine operating mode the misfire error occurs.
Without ignition, there is no power stroke in the cylinder, which affects the crankshaft rotation speed. The engine ECU receives information from the crankshaft position sensor, so based on the moment of deceleration, the CV can calculate which cylinder is misfiring.
- P0300 – multiple misfires. This means that burning problems are not limited to just one cylinder;
- P03001, P03002, P03003, P03004, P0300n... - misfires in a specific cylinder. Where N is the serial number of the combustion chamber in which the malfunction occurs.
On which cars is this problem most common?
The problem with code P0302 can occur on different machines, but there are always statistics on which brands this error occurs more often. Here is a list of some of them:
- Audi (Audi a4, Audi A5, Audi q3)
- BMW (BMW X3, BMW X5, E46, F10)
- Chery (Chery Fora)
- Chevrolet (Chevrolet Aveo, Cobalt, Cruz, Orlando, Suburban)
- Chrysler (Chrysler 300c)
- Dodge (Dodge Neon, Ram)
- Fiat
- Ford (Ford Kuga, Mondeo, Fiesta, Focus, Fusion, Explorer, F-150)
- Honda (Honda Jazz, SRV, Civic)
- Hyundai (Hyundai Accent, Getz, Santa Fe, Solaris, Sonata, Elantra)
- Infiniti
- Jeep (Jeep Wrangler, Grand Cherokee)
- Kia (Kia Rio, Sid, Sorento, Sportage, Cerato)
- Lexus (Lexus rx300)
- Mazda (Mazda 3, Mazda 6, Mazda BT 50, Mazda cx7, Millenia)
- Mercedes
- Mitsubishi (Mitsubishi ACX, Outlander, Galant, Karizma, Lancer, Pajero, L200)
- Nissan (Nissan Almera, Altima, Qashqai, Tiida)
- Opel (Opel Antara, Astra, Vectra, Zafira, Corsa, Meriva)
- Peugeot
- Pontiac (Pontiac Montana)
- Renault (Renault Duster, Logan, Megan, Sandero, Fluence)
- Skoda (Skoda Octavia, Superb, Fabia)
- Ssangyong (Sangyong Kyron)
- Subaru (Subaru Outback, Impreza, Legacy, Forester)
- Suzuki (Suzuki Liana)
- Toyota (Toyota Venza, Camry, Corolla, Rav4, Highlander)
- Volkswagen (Volkswagen Golf, Jetta, Passat, Polo Sedan, Tiguan)
- Volvo (Volvo s40)
- Vortex (Vortex Tingo)
- VAZ 2110, 2112, 2114, 2115
- Volga Cyber
- Gazelle Business, umz 4216
- Zaz Sens, Chance
- Lada Kalina, Largus, Niva, Priora
- UAZ Patriot
With fault code P0302, you can sometimes encounter other errors. The most common ones are: P0016, P0171, P0175, P0201, P0202, P0300, P0301, P0303, P0304, P0305, P0306, P0357.
Diagnostics
Error on display - misfire
An unpleasant situation when a motorist comes to the car, starts it, but cannot move off normally because it begins to twitch. This means that there are problems with the ignition.
Diagnosing a malfunction is quite easy, because the electronic engine control unit immediately recognizes the error.
Before you get into the ECU, you should look to see if the “ Check Engine ” light has come on on the instrument panel. So, this is a signal that errors have appeared in the operation of the main power unit. If the “brains” controller is equipped with a display located on the instrument panel, then the error can be determined immediately.
What are these errors?
Codes p0300, p0301 and p0302 indicate failures in the ignition sequence. Their characteristic stands for “random multiple misses in cylinders.” If you use a special device for engine diagnostics, it will display the phrase “Random cylinder misfire detection system.”
Why is an ignition failure dangerous for a car? This question can only be answered after a brief examination of the operation of the engine as a whole. After starting, the engine operates in four-stroke mode:
Accordingly, if there is no ignition in at least one engine cylinder, then the engine begins to “triple”, and the control unit records the omission of one of the mandatory cycles of the power unit. Ignition is the process of igniting the air-fuel mixture, and if the mixture does not ignite, then the cylinder has no power stroke. That is, one of the engine cylinders accelerates much more slowly than the others, which disrupts the entire ignition order as a whole.
In this regard, when the ECU detects such a failure, it immediately sends a signal to the dashboard in the form of error p0300: the yellow “Check Engine” light comes on.
It should be noted that immediately after skipping one of the cylinder operation cycles, the level of toxin concentration in the exhaust gas system increases. And the superheated exhaust gases in the pipe quickly heat up the catalyst unit, which can cause it to undergo deformation (the honeycombs melt at temperatures above 800 degrees Celsius).
Driving a car with multiple misfires is comparable only to walking on one leg. Sooner or later the motor will no longer cope with the load and will fail. Therefore, car owners are strongly recommended to immediately take the necessary measures when an error is displayed.
Symptoms of malfunction
The main driver symptom of P0303 is the MIL (Malfunction Indicator Light) illumination. It is also called Check engine or simply “check light”.
They can also appear as:
- The “Check engine” warning light on the control panel will light up (the code will be stored in the ECM memory as a malfunction).
- The engine stalls or has trouble starting.
- Floating speed, as well as attempts to stall at idle.
- Jerking/misfire at idle or under load.
- Poor speed gain.
- Increased fuel consumption.
- Reduced engine power.
- Smell of fuel from the exhaust.
This malfunction is considered serious and must be corrected as soon as possible. Because prolonged driving with a misfire can cause costly damage to the engine and catalytic converters.
P0300 - misfire error. Causes, consequences, elimination
Error code P0300 indicates a violation of the ignition order , which stands for random multiple misfires of the cylinders ; in English, the diagnostic tool displays: “Random cylinder misfire detection system.” If a misfire is detected in a specific cylinder, then the last digit “P030x” will change to 1, 2, 3, 4 and so on up to 6 or even 12, depending on which particular “pot” the misfire is in. So error P0300 is derived from errors such as P0301, P0302, P0303, P0304. Most often they occur due to a lack of spark, a fuel supply failure or problems with the exhaust gases.
Let's look at the list of possible causes of misfires, why error p0301, error p0302, error p0303, error p0304 or others of this kind appears, the consequences and methods of elimination, in more detail.
What repairs can fix the P0301 code?
- Replacing damaged spark plugs
- Replacing worn or damaged spark plug wires and/or ignition coils
- Repair or replace clogged EGR pipes and/or valve
- Replacing burnt valves
- Repairing Vacuum Leaks
- Repairing or replacing a damaged cylinder head gasket
- Replacing a faulty camshaft position sensor
- Replacing a faulty crankshaft position sensor
- Replacing a faulty air flow sensor
- Replacing a faulty oxygen sensor
- Replacing a faulty throttle position sensor
- Replacing a faulty fuel injector
- Replacing a faulty catalytic converter
- Elimination of all present errors
- Replacing the ignition distributor cap and slider (if equipped), as well as wires, spark plugs and ignition coils
- If necessary, repair faulty internal engine components
- Engine replacement (if cylinder is damaged)
- In rare cases, replacing or reprogramming the PCM
Error P0303 Lada – misfire in the third cylinder
Misfire detected in cylinder 3
Possible causes of the error in a Lada car: • The ignition coil of the third cylinder is faulty • The spark plug of the third cylinder is faulty • The injector of the third cylinder is clogged or faulty • The wiring of the ignition coil of the third cylinder is broken or shorted • The wiring of the injector of the third cylinder is broken or shorted • The wiring connector of the injector of the third cylinder is faulty • Malfunction of the ignition coil connector of the third cylinder • Incorrect fuel pressure • Low compression in the 3rd cylinder • Intake manifold air leak
Error code P0303 means that a misfire or random misfire has been detected in the third cylinder of the VAZ engine. It is better to carry out diagnostics in the following sequence - check the intake tract for air leaks, the next step is to replace the spark plug in the third cylinder. If the problem cannot be solved by these two points, then it is necessary to carry out additional diagnostics, which are described in detail here.
POSSIBLE SYMPTOMS OF ERROR P0303 VAZ
: • “CHEK ENGINE” signal is on; • Lack/loss of engine power; • The engine shakes. Uneven engine operation; • It is difficult to start the engine. Especially cold.
Description of error P0303 Lada If a misfire occurs, the engine speed will fluctuate. If changes in engine speed are sufficient to change the crankshaft position (CKP) sensor signal, the engine control module (ECM) detects the P0303 Lada .
