P0305 Code – Meaning, Causes, Symptoms (& How To Fix)
If you have scanned your engine computer to see what’s causing trouble and found the P0305 code, you might wonder what is going on and how to fix it. Thankfully, it doesn’t take a lot of troubleshooting to get to the bottom of this issue.
This guide will explain the meanings and how to fix the trouble code P0305. You will learn what could happen and the best way to fix it.
- Definition of Code P0305
- What is the P0305 Coding?
- Trouble Code P0305 Symptoms
- What causes the Code P0305?
- Is the P0305 Code Really Serious?
- How can you fix the code P0305?
- Common mistakes in diagnosing P0305
- How do you diagnose the P0305 trouble code?
- The estimated cost of repair
- The P0305 Code: Mechanics Tips
- Commonly Asked Questions
Definition of Code P0305
P0305 – Cylinder #5 Misfire Detected
What is the P0305 Coding?
P0305 DTC means that there’s an engine misfire in cylinder 5. Powertrain control module (PCM), which detects a misfiring engine in cylinder 5, alerts the engine and sets the trouble code. It’s a generic code, applying to all OBD-II equipped models.
Although the trouble code P0305 might seem generic, repairs may be required depending on your make or model. You might also notice the P0300 code if there are several misfires. This could be combined with any other codes that indicate problems with other parts of your vehicle.
Trouble Code P0305 Symptoms
You should be able to notice performance problems if one engine cylinder is not firing. The Check Engine Light will also be on when you set the code, alerting to any problems.
Here are some of the top symptoms you’ll notice with the P0305 DTC.
What causes the Code P0305?
A variety of issues can cause a car to stop working. In some cases, the issues could stem from the ignition system, but it’s also possible that something has failed with the fuel system.
These are the top causes of P0305 trouble codes.
Is the P0305 Code Really Serious?
Extreme – The P0305 DTC is considered one that should be taken seriously. An engine misfire could make driving dangerous. This is especially true if your car stalls in the middle. You could be in danger if the engine suddenly stops.
It’s important to have the P0305 trouble code examined as soon as possible. Other engine problems can be caused by misfiring engines, which will increase the cost of repairs. You might also need to hire a tow truck if your car is unable to start.
How can you fix the code P0305?
It is essential to perform an extensive diagnosis before you begin any repair. Otherwise, you could spend unnecessary money on parts that aren’t needed.
Here are some possible solutions based on the most common failures.
- Replace spark plug
- Replacing the coil/wires
- Replace your fuel injector
- Fix leaking valve
- Repair vacuum leak
- Replacing the piston ring
- Repair leaking head gasket
- Replacing computer module
Common mistakes in diagnosing P0305
Most often, misfires are caused by spark plugs. However, you should never assume that’s the problem without first performing the diagnostic steps we outline. It is important to inspect the wires, plugs, coils, as well as coil packs before you replace them.
You can then move on to parts that are not working properly. Also, you should perform a compression test. Additionally, if there are any other trouble codes present, these might help you narrow down what’s going on.
How do you diagnose the P0305 trouble code?
Professional mechanics should follow a plan for diagnosing P0305 codes. Gathering the code from the scanner is just the first step of figuring out what’s wrong. You will be able to find the solution by following the correct steps.
These are some of the more common steps to diagnose the P0305 DTC.
- Collect the trouble codes with your OBD-II scanner and use freeze frame data to see what’s going on. You can continue troubleshooting using the additional trouble codes that you find.
- Set the code back to default.
- You can test drive your vehicle and see which codes return.
- Check the spark plug and ignition coil as well as any coil packs on cylinder 5, to determine whether they are damaged or worn. Replace if necessary. You can try to move over the spark plug and ignition coil to another cylinder to see if you get a trouble code on the other cylinder instead – if so replace the faulty spark plugs and ignition coil.
- For a vacuum leak, check the intake system.
- If this isn’t the problem or the code doesn’t go away, you will need to inspect the fuel injectors.
- Older cars may also require you to check the distributor cap or the ignition cables.
- A compression test on cylinder 5 is required.
- Inspect the camshaft timing, and the timing belt/shaft if needed.
- If the diagnostics show no other problems, the PCM might be bad and should be replaced. However, with this problem, you’ll likely see other false codes or problems.
The estimated cost of repair
Depending on what’s causing the problem, you are looking at a varying amount of repair costs. You will pay less to repair some problems than others. We have listed below the top repairs as well as the average price for labor.
- Replace spark plug – $40-$350
- Replace ignition coils/wires – $75-$400
- Install a new fuel injector – $200-$500
- Fix leaking valve – $500-$2,500
- Replace piston ring – $1,000-$5,000
- Repair leaking head gasket – $1,500-$3,000
- Replace computer module – $750-$3,500
The P0305 Code: Mechanics Tips
It is possible to replace the cylinder 5 plug, if the problem causes the p0305 error code. However, it’s always a better idea to replace all of the plugs at the same time. One plug is likely to fail, and the rest will soon follow. It is easy to stick to a maintenance plan if you replace all the spark plugs at once.
Also, ensure that spark plugs have a proper gap. It is possible to have a misfire if the gap between spark plugs and metal is not right. Use a spark plug gap tool to ensure the space matches the manufacturer’s specs.
Other Trouble Codes
Commonly Asked Questions
Can I drive safely with the P0305 code
A P0305 error code is dangerous and it should not be used to cause unsafe driving conditions. If your engine misfires on cylinder 5, the P0305 error code is displayed. The P0305 code indicates that the engine is misfiring on cylinder 5.
Is it worth fixing the P0305 problem?
You must first diagnose the problem and determine the cost of fixing the code P0305. It could cost between $50 to $150 to fix a simple problem like a bad spark plug or ignition coil. It is possible that the P0305 code could be caused by low compression. In rare instances, this can cost over $5000.
What is the best way to fix error P0305
The P0305 code can be fixed by diagnosing and determining the cause of misfires in cylinder 5. The most common reason for a P0305 error is a bad spark plug or ignition coil. This is where the diagnostics should begin.
What does P0305 mean?
If you see the P0305 code, it means that your engine control module detected misfires in #5 and needs to be corrected. A failing spark, low fuel compression or problems with fuel delivery can all cause misfires in car engines.
Why is the P0305-code so common?
Many issues can lead to engine misfires in cylinder 5. This will result in a code P0305. Faulty spark plugs or ignition coils are the main causes of a P0305 problem code. Other possible causes include vacuum leaks, faulty fuel injectors, and even a malfunctioning ignition coil.
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