P0308 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0308 2015 Chevrolet Silverado?
- 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 2015 Chevrolet Silverado?
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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado code?
Need more information on how to fix the P0308 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
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Frequently Asked Questions about P0308 2015 Chevrolet Silverado Code
What does OBDII code P0308 mean for a 2015 Chevrolet Silverado?
P0308 indicates a misfire has been detected in cylinder 8, which can cause rough engine performance and decreased fuel efficiency.
What are the common symptoms of code P0308 in a 2015 Chevrolet Silverado?
Symptoms include rough idle, poor acceleration, engine shaking, reduced power, increased fuel consumption, and the check engine light turning on.
What causes a cylinder 8 misfire in a 2015 Chevrolet Silverado?
Common causes include faulty spark plugs, bad ignition coils, a clogged fuel injector, vacuum leaks, low compression, or wiring issues.
Can driving with code P0308 damage my 2015 Chevrolet Silverado?
Yes, prolonged driving with a misfire can cause damage to the catalytic converter and other engine components. It’s best to address the issue promptly.
How can I diagnose the cause of code P0308 in my Silverado?
Start by inspecting the spark plug and ignition coil for cylinder 8, checking for vacuum leaks, testing the fuel injector, and performing a compression test.
How do I fix code P0308 on a 2015 Chevrolet Silverado?
Repairs may include replacing the spark plug or ignition coil for cylinder 8, cleaning or replacing the fuel injector, fixing vacuum leaks, or addressing engine compression issues.
Is code P0308 specific to cylinder 8 in the engine?
Yes, P0308 specifically refers to a misfire detected in cylinder 8, which is one of the engine’s designated cylinders.
Can bad fuel cause a P0308 misfire in a 2015 Chevrolet Silverado?
Yes, poor-quality or contaminated fuel can contribute to cylinder misfires, including P0308. Using high-quality fuel and checking for fuel system issues can help.
What tools are needed to diagnose and fix code P0308?
Tools may include an OBDII scanner, spark plug socket, multimeter, compression tester, and basic hand tools for removing and inspecting components.
Should I reset the check engine light after fixing code P0308?
Yes, after repairs, use an OBDII scanner to clear the code and reset the check engine light. Drive the vehicle to ensure the issue is resolved.
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