P0307 2017 GMC Sierra Code - Cylinder 7 Misfire Detected
Quick Answer
A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7. 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
- P0307 2017 GMC Sierra indicates Cylinder 7 Misfire Detected.
- Common causes
- Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7.
- 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 P0307 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0307 2017 GMC Sierra?
- Faulty spark plug 7
- Clogged or faulty fuel injector 7
- Faulty ignition coil 7
- Fuel injector 7 harness is open or shorted
- Fuel injector 7 circuit poor electrical connection
- Ignition coil 7 harness is open or shorted
- Ignition coil 7 circuit poor electrical connection
- Insufficient cylinder 7 compression
- Incorrect fuel pressure
- Intake air leak
How to Fix the DTC P0307 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 P0307
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 P0307 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 P0307 2017 GMC Sierra code?
Need more information on how to fix the P0307 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0307 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0307 2017 GMC Sierra Code
1. What does the OBDII code P0307 mean on a 2017 GMC Sierra?
P0307 indicates that the engine control module (ECM) has detected a misfire in cylinder 7 of your GMC Sierra.
2. What are common symptoms of a P0307 code?
Symptoms include rough idling, reduced engine performance, poor fuel economy, difficulty starting, and the check engine light being illuminated.
3. What causes a P0307 code on a 2017 GMC Sierra?
Common causes include a faulty spark plug, bad ignition coil, fuel injector issues, low cylinder compression, or problems with the cylinder 7 valve train.
4. Can a P0307 code damage my engine if ignored?
Yes, ignoring a P0307 code can lead to further engine damage, such as catalytic converter failure or internal engine problems due to prolonged misfiring.
5. How do I diagnose the P0307 code on my GMC Sierra?
Start by checking the spark plug, ignition coil, and wiring for cylinder 7. Then inspect the fuel injector, and perform a compression test to rule out mechanical issues.
6. Can a dirty air filter cause a P0307 code?
While unlikely, a severely clogged air filter can contribute to poor engine performance and exacerbate misfire issues, though it’s not a direct cause of P0307.
7. How much does it cost to fix a P0307 code on a 2017 GMC Sierra?
Repair costs vary depending on the cause. Replacing a spark plug or ignition coil may cost $100–$300, while addressing mechanical issues like valve problems could exceed $1,000.
8. Is it safe to drive with a P0307 code?
Driving with a P0307 code is not recommended, as it can lead to decreased performance, increased fuel consumption, and potential engine or catalytic converter damage.
9. Can a vacuum leak cause a P0307 code?
A vacuum leak can cause a misfire, but it's less likely to affect just one cylinder. However, it’s worth checking for intake manifold leaks near cylinder 7.
10. Will clearing the code fix a P0307 issue?
Clearing the code will turn off the check engine light temporarily, but the underlying issue causing the misfire must be repaired to prevent the code from returning.
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