P0306 2017 GMC Sierra 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 2017 GMC Sierra 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.
Code P0306 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0306 2017 GMC Sierra?
- 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 2017 GMC Sierra?
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.
Code Tech Notes
There is a Factory Service Bulletins for All 2000-2020 Chevrolet Models:
2000-2020 Chevrolet Factory Service Bulletin OBDII Code P0306
This Factory Service Bulletin explains how this condition may be caused by significant carbon build-up on the intake and/or exhaust valves due to fuel contamination or incomplete burning of the fuel.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0306 2017 GMC Sierra 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.
Need more information about the P0306 2017 GMC Sierra code?
Need more information on how to fix the P0306 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
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Frequently Asked Questions about P0306 2017 GMC Sierra Code
What does the OBDII code P0306 mean for a 2017 GMC Sierra?
P0306 indicates a misfire has been detected in cylinder 6 of the engine.
What are the common symptoms of a cylinder 6 misfire in a 2017 GMC Sierra?
Symptoms may include rough idling, reduced engine power, poor fuel economy, and the Check Engine Light turning on.
What causes the P0306 code in a 2017 GMC Sierra?
Common causes include faulty spark plugs, ignition coils, fuel injectors, low compression, or vacuum leaks affecting cylinder 6.
Can driving with a P0306 code damage my 2017 GMC Sierra?
Prolonged driving with a misfire can cause damage to the catalytic converter and other engine components.
How do I diagnose the P0306 code in my 2017 GMC Sierra?
Start by inspecting the spark plug, ignition coil, and fuel injector for cylinder 6. Check for vacuum leaks and perform a compression test if necessary.
How do I fix the P0306 code on a 2017 GMC Sierra?
Repair steps may include replacing the cylinder 6 spark plug, ignition coil, or fuel injector, addressing vacuum leaks, or fixing compression issues.
Can bad fuel cause a P0306 code in a 2017 GMC Sierra?
Yes, contaminated or poor-quality fuel can contribute to cylinder misfires, including P0306.
How much does it cost to fix a P0306 code on a 2017 GMC Sierra?
Repair costs vary depending on the cause, ranging from $50 for spark plug replacement to several hundred dollars for more complex issues.
Will clearing the code fix the P0306 problem on my 2017 GMC Sierra?
Clearing the code will temporarily remove the Check Engine Light, but the underlying issue must be addressed to prevent the code from returning.
Can a dirty air filter cause a P0306 code in a 2017 GMC Sierra?
While unlikely, a severely clogged air filter can affect air intake and contribute to engine misfires.
Discuss the causes and fixes for P0306 2017 GMC Sierra OBDII Code
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