AutoCodes – Saturn – P0305 Saturn

P0305 Saturn Code - Cylinder 5 Misfire Detected

Quick Answer

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty spark plug 5, Clogged or faulty fuel injector 5, Faulty ignition coil 5. 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: P0305 Saturn indicates Cylinder 5 Misfire Detected.
Common causes: Common causes include Faulty spark plug 5, Clogged or faulty fuel injector 5, Faulty ignition coil 5.
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 9,936

How popular is this code, among other codes? Low

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 09, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0305 Saturn Description

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. The Engine Control Module (ECM) can detect these variations by closely monitoring the crankshaft position sensor signal. The signals of the camshaft position sensors are used to determine which cylinder is misfiring. If the ECM detects a misfire rate sufficient to cause emission levels to exceed mandated standards, the Diagnostic Trouble Code (DTC) will be set. Under certain driving conditions, a misfire rate can be high enough to cause the catalytic converter to overheat, damaging the converter. The Malfunction Indicator Lamp (MIL) flashes when the converter is overheating, damaging conditions are present, and the DTC is set. The DTC will be set when the ECM detects a crankshaft rotation speed variation indicating a single-cylinder misfire rate sufficient to cause emissions levels to exceed mandated standards.

OBDII Code P0305 Saturn - Cylinder 5 Misfire Detected - AutoCodes.com — P0305 Saturn Code - Cylinder 5 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0305 Saturn?

Faulty spark plug 5
Clogged or faulty fuel injector 5
Faulty ignition coil 5
Fuel injector 5 harness is open or shorted
Fuel injector 5 circuit poor electrical connection
Ignition coil 5 harness is open or shorted
Ignition coil 5 circuit poor electrical connection
Insufficient cylinder 5 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0305 Saturn?

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 P0305 code means that the cylinder 5 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 5. 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 P0305 Saturn 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 P0305 Saturn Code

1. What are the common symptoms of OBDII code P0305 in a Saturn indicating Cylinder 5 Misfire Detected?

- Common symptoms include engine misfiring, rough idling, loss of power, and possible engine vibrations.

2. What are the possible causes of OBDII code P0305 in a Saturn related to Cylinder 5 misfire?

- Possible causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.

3. How can I diagnose and repair OBDII code P0305 in a Saturn with Cylinder 5 misfire?

- Begin by inspecting and replacing spark plugs, ignition coils, and fuel injectors. Check for vacuum leaks, perform a compression test, and scan the engine control module for any related issues.

4. Can driving with OBDII code P0305 in a Saturn be harmful to the vehicle?

- Continuing to drive with a misfiring cylinder can cause damage to the catalytic converter, lead to decreased fuel efficiency, and potentially harm the engine over time.

5. How do I reset OBDII code P0305 in a Saturn after repairing the Cylinder 5 misfire issue?

- Use an OBDII scanner to clear the trouble code from the engine control module's memory after resolving the underlying problem causing the misfire.

6. Are there any preventive maintenance tips to avoid OBDII code P0305 in a Saturn?

- Regularly inspect and replace spark plugs, ignition components, and fuel filters according to the manufacturer's recommended maintenance schedule to help prevent cylinder misfires.

7. Can extreme weather conditions contribute to triggering OBDII code P0305 in a Saturn?

- Yes, extreme cold or hot weather conditions can sometimes exacerbate existing issues with ignition components or fuel delivery systems, leading to cylinder misfires.

8. Is it safe to continue driving my Saturn with a flashing check engine light due to OBDII code P0305?

- A flashing check engine light typically indicates a severe misfire that can cause damage to the catalytic converter. It is not safe to drive the vehicle in this condition and should be diagnosed and repaired promptly.

9. How long does it typically take to repair OBDII code P0305 in a Saturn caused by Cylinder 5 misfire?

- The repair time can vary depending on the exact cause of the misfire. Simple fixes like replacing spark plugs or ignition coils can be done quickly, while more complex issues may require more time for diagnosis and repair.

10. Can using low-quality fuel contribute to triggering OBDII code P0305 in a Saturn?

- Using low-quality or contaminated fuel can sometimes cause misfires by affecting combustion in the cylinders. It is advisable to use high-quality fuel from reputable sources to help prevent such issues.