AutoCodes – Pontiac – P0306 Pontiac

P0306 Pontiac Code - Cylinder 6 Misfire Detected

Quick Answer

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty spark plug 6, Clogged or faulty fuel injector 6, Faulty ignition coil 6. 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: P0306 Pontiac indicates Cylinder 6 Misfire Detected.
Common causes: Common causes include Faulty spark plug 6, Clogged or faulty fuel injector 6, Faulty ignition coil 6.
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 15,370

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 P0306 Pontiac 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 P0306 Pontiac - Cylinder 6 Misfire Detected - AutoCodes.com — P0306 Pontiac Code - Cylinder 6 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0306 Pontiac?

Faulty spark plug 6
Clogged or faulty fuel injector 6
Faulty ignition coil 6
Fuel injector 6 harness is open or shorted
Fuel injector 6 circuit poor electrical connection
Ignition coil 6 harness is open or shorted
Ignition coil 6 circuit poor electrical connection
Insufficient cylinder 6 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0306 Pontiac?

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 P0306 code means that cylinder 6 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 6. 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 P0306 Pontiac 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 P0306 Pontiac Code

1. What are the common symptoms of OBDII code P0306 in a Pontiac indicating Cylinder 6 misfire?

- Common symptoms include rough idling, loss of power, engine vibration, and potential engine stalling.

2. What are the possible causes of a Cylinder 6 misfire detected in a Pontiac triggering code P0306?

- Typical causes include faulty ignition system components, such as spark plugs, ignition coils, or spark plug wires, as well as fuel delivery issues or vacuum leaks.

3. How can I diagnose the source of a Cylinder 6 misfire in my Pontiac when facing code P0306?

- Diagnose by checking the condition of spark plugs, inspecting ignition coils, testing fuel injectors, examining vacuum lines for leaks, and scanning for other potential engine problems.

4. Can a dirty or clogged fuel injector cause a Cylinder 6 misfire leading to code P0306 in a Pontiac?

- Yes, a dirty or clogged fuel injector can disrupt the fuel-air mixture in Cylinder 6, leading to misfires and triggering code P0306.

5. Is it safe to drive my Pontiac with OBDII code P0306 related to a Cylinder 6 misfire?

- It is not recommended to drive the vehicle with a misfiring cylinder as it can cause further damage to the engine and other components. Immediate attention and repair are advised.

6. How can I prevent OBDII code P0306 from reoccurring in my Pontiac after repairing a Cylinder 6 misfire issue?

- Regular maintenance, such as replacing spark plugs and ignition components at recommended intervals, using high-quality fuel, and addressing engine issues promptly, can help prevent code P0306 from returning.

7. Can a faulty oxygen sensor contribute to triggering code P0306 for a Cylinder 6 misfire in a Pontiac?

- While a faulty oxygen sensor is not a direct cause of cylinder misfires, it can affect the air-fuel mixture, potentially leading to misfires in one or more cylinders, including Cylinder 6.

8. Are there any DIY repair tips for addressing OBDII code P0306 related to a Cylinder 6 misfire in a Pontiac?

- DIY repair tips may include checking and replacing spark plugs, inspecting ignition coils, ensuring proper fuel delivery, and verifying vacuum lines for leaks before seeking professional help if needed.

9. Can extreme weather conditions, such as cold temperatures, contribute to triggering code P0306 for a Cylinder 6 misfire in a Pontiac?

- Yes, extreme weather conditions can affect the engine's performance, including ignition and fuel delivery, which may lead to misfires in Cylinder 6 and trigger OBDII code P0306.

10. How important is it to address OBDII code P0306 indicating a Cylinder 6 misfire in a Pontiac promptly?

- It is crucial to address code P0306 promptly to prevent further engine damage, maintain optimal performance, and ensure the safety and reliability of your Pontiac.