AutoCodes – Acura – P0301 Acura

P0301 Acura Code - No. 1 Cylinder Misfire Detected

Quick Answer

The crankshaft vibrates slightly when each cylinder fires. Common causes include Valve adjustment, Faulty spark plug #1, Faulty ignition coil #1. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0301 Acura indicates No. 1 Cylinder Misfire Detected.
Common causes: Common causes include Valve adjustment, Faulty spark plug #1, Faulty ignition coil #1.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 45,668

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 16, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0301 Acura Description

The crankshaft vibrates slightly when each cylinder fires. If a misfire occurs, the crankshaft rotation speed changes rapidly. The Powertrain Control Module (PCM) monitors the crankshaft rotation speed based on the output pulses from the Crankshaft Position (CKP) Sensor. By monitoring changes in the crankshaft rotation speed, the PCM counts the number of misfires and determines which cylinder is misfiring. If a misfire is detected, a Diagnostic Trouble Code (DTC) is stored.
There are two types of misfire detection: Type 1: When the number of misfires per 200 engine revolutions reaches the level that can damage the three-way catalyst (TWC), a DTC is stored and the MIL blinks. Type 2: When the number of misfires per 1,000 engine revolutions reaches the level that affects exhaust emissions but is not severe enough to immediately damage the catalyst, a DTC is stored, and the MIL comes on.

OBDII Code P0301 Acura - No. 1 Cylinder Misfire Detected - AutoCodes.com — P0301 Acura Code - No. 1 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0301 Acura?

Valve adjustment
Faulty spark plug #1
Faulty ignition coil #1
Clogged or faulty fuel injector #1
Intake air leak
Insufficient cylinder #1 compression
Incorrect fuel pressure

How to Fix the DTC P0301 Acura?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0301 code means that cylinder #1 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #1. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0301 Acura code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0301 Acura Code

1. What are the common symptoms of an OBDII code P0301 (No. 1 Cylinder Misfire Detected) in an Acura?

Symptoms may include engine misfires, rough idle, loss of power, and potential engine vibrations.

2. What are some possible causes of the P0301 code in an Acura?

Common causes can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or issues with the engine's compression.

3. How can I diagnose the source of a cylinder misfire in my Acura with the P0301 code?

You can perform a thorough inspection of the spark plugs, ignition coils, fuel injectors, and vacuum hoses. Using a diagnostic tool to check live data can also help pinpoint the issue.

4. Can a dirty or clogged fuel injector cause the P0301 code in an Acura?

Yes, a dirty or clogged fuel injector can disrupt the proper air-fuel mixture in the No. 1 cylinder, leading to a misfire and triggering the P0301 code.

5. Is it safe to continue driving my Acura with the P0301 code?

It is not recommended to drive with a cylinder misfire as it can cause further damage to the engine and catalytic converter. Immediate attention is advised.

6. How much does it typically cost to repair a P0301 code in an Acura?

The cost of repairs can vary depending on the root cause of the misfire. It can range from replacing spark plugs or ignition coils to more extensive repairs, potentially costing a few hundred to a couple thousand dollars.

7. Can a P0301 code be triggered by a simple issue like a loose gas cap?

While less common, a loose gas cap causing a small vacuum leak could potentially lead to a misfire and trigger the P0301 code. It's worth checking the gas cap as part of troubleshooting.

8. Are there any preventative maintenance tips to avoid the P0301 code in an Acura?

Regularly changing spark plugs, maintaining a clean fuel system, and promptly addressing any engine performance issues can help prevent cylinder misfires and the P0301 code.

9. Will resetting the OBDII code temporarily fix the P0301 issue in my Acura?

Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the misfire. It's crucial to diagnose and address the root cause of the problem.

10. Can a P0301 code in an Acura be caused by a malfunctioning engine control module (ECM)?

While rare, a faulty ECM could potentially cause a misfire in the No. 1 cylinder and trigger the P0301 code. However, it's advisable to rule out more common causes before suspecting the ECM.