P0308 2014 GMC Sierra Code - Cylinder 8 Misfire Detected
Quick Answer
A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty spark plug 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8. 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
- P0308 2014 GMC Sierra indicates Cylinder 8 Misfire Detected.
- Common causes
- Common causes include Faulty spark plug 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8.
- 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 P0308 2014 GMC Sierra Description
What are the Possible Causes of the DTC P0308 2014 GMC Sierra?
- Faulty spark plug 8
- Clogged or faulty fuel injector 8
- Faulty ignition coil 8
- Fuel injector 8 harness is open or shorted
- Fuel injector 8 circuit poor electrical connection
- Ignition coil 8 harness is open or shorted
- Ignition coil 8 circuit poor electrical connection
- Insufficient cylinder 8 compression
- Incorrect fuel pressure
- Intake air leak
How to Fix the DTC P0308 2014 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 P0308
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 P0308 2014 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 P0308 2014 GMC Sierra code?
Need more information on how to fix the P0308 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0308 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0308 2014 GMC Sierra Code
1. What are the common symptoms of OBDII code P0308 in a 2014 GMC Sierra?
- Common symptoms include engine misfires, rough idling, loss of power, and potential hesitation during acceleration.
2. What are the possible causes of a cylinder 8 misfire detected in a 2014 GMC Sierra?
- Potential causes include faulty spark plugs, ignition coil issues, fuel injector problems, vacuum leaks, or a problem with the cylinder compression.
3. How can I diagnose the specific cause of a cylinder 8 misfire in my 2014 GMC Sierra?
- To diagnose the issue, you can perform a thorough inspection of the spark plugs, ignition coils, fuel injectors, and check for any vacuum leaks. Using an OBDII scanner can help pinpoint the exact cause.
4. Is it safe to continue driving my 2014 GMC Sierra with OBDII code P0308?
- It is not recommended to drive the vehicle with a misfire as it can cause further damage to the engine and emissions system. It is best to address the issue promptly.
5. What is the typical repair process for addressing a cylinder 8 misfire in a 2014 GMC Sierra?
- The repair process usually involves replacing the spark plugs, inspecting and potentially replacing the ignition coil, checking the fuel injector, and addressing any vacuum leaks.
6. Can a DIY enthusiast fix the cylinder 8 misfire detected in a 2014 GMC Sierra?
- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the issue by replacing spark plugs or ignition coils. However, more complex issues may require professional assistance.
7. How much can I expect to pay for repairing OBDII code P0308 in a 2014 GMC Sierra?
- Repair costs can vary depending on the exact cause of the misfire and local labor rates. It is advisable to get a diagnosis from a mechanic to determine the cost accurately.
8. Will resetting the OBDII code P0308 in my 2014 GMC Sierra make the issue go away?
- Resetting the code may temporarily turn off the Check Engine Light, but it will not address the underlying problem causing the misfire. The issue is likely to reoccur if not fixed.
9. Are there any preventive maintenance tips to avoid OBDII code P0308 in a 2014 GMC Sierra?
- Regularly servicing your vehicle, including changing spark plugs at recommended intervals, using quality fuel, and addressing any engine performance issues promptly, can help prevent misfires.
10. Can weather conditions affect the occurrence of a cylinder 8 misfire in a 2014 GMC Sierra?
- Extreme weather conditions, such as very cold or hot temperatures, can sometimes exacerbate existing issues that lead to misfires. Ensuring your vehicle is properly maintained can help mitigate these effects.
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