My shopping cart
Your cart is currently empty.Continue Shopping
Published on December 19th, 2023
Innova R&D Team
Here to assist you in any form & shape
Innova diagnostic scanners assist you in understanding your vehicle, finding problems, and providing guidance for repairs. You can access the same advanced technology used by professionals, without the high costs or subscription fees.Learn more about Innova Scanners
To guide you through the procedure to check Diagnostic Trouble Code (DTC) P0307 and replace spark plug wires and spark plugs to resolve DTC P0307.
If the Check Engine Light or Malfunction Indicator Lamp (MIL) is illuminated on the dashboard and the Engine Control Module (ECM) stored DTC P0307, you will examine misfiring cylinders in the car. This article will help you diagnose a DTC P0307 code and replace spark plug wires and spark plugs to fix this code on a Chevrolet Silverado.
P0307: Cylinder 7 Misfire Detected - This means the No. 7 cylinder is misfiring. A misfire may damage the three-way catalytic converter and cause the MIL to blink immediately.
Symptoms of this fault are:
Possible causes of this fault are:
With P0307 on a 2014 - 2019 Chevrolet Silverado V8-5.3L, replacing the spark plug wires and spark plugs may resolve this concern.
(This image is for illustrative purposes only and may not match the actual part number)
|Time Required (hour)
|Chevrolet Silverado V8-5.3L
Discover your ideal OBD2 scanner by answering a few questions.
Only takes a few seconds.
Before you begin replacing the spark plug(s), you'll need to inspect the ignition coil wire(s), spark plug wire(s) or connector(s) to ensure they fit tightly on the spark plugs.
Remove the valve rocker arm cover insulator, then remove the spark plug wire, spark plug and/or connector from the No. 7 cylinder, and measure the secondary resistance (332 to 460 Ohms per 25.4 mm, replace if out of spec), and move them to another cylinder(s).
Clear DTC(s) and Freeze Frame (FF) information, and perform the verification test.
If a DTC is set for the cylinder where the spark plug wire and/or spark plug was moved, replace the spark plug wire and/or spark plug.
Ensure that the engine is cooled completely before removing the old spark plugs. Adjust the new spark plugs to the proper gap, and do not over-tighten the spark plugs. Inspect the spark plug wire for damage and replace it if necessary.
Sometimes, it helps to just push ahead and take a leap of faith! Learn more about our OBD2 scanners and how it can help diagnose the hidden issues with your vehicle.Get Started
SUBSCRIBE & GET ACCESS TO LIMITED-TIME OFFERS