P0307 Chevy Silverado (Causes & Fix)

You noticed your Silverado is running rough and decided to check for error codes using an OBD scanner and you got a p0307 code. What does this mean? well, in this article I am going to walk you through the common causes for this code and how to fix it.

P0307 chevy Silverado meaning

P0307 is an indication that cylinder 7 is misfiring. A lot of things can cause an engine to misfire, I will go through the common cause for this one a chevy Silverado below, first let me explain what it means when an engine is misfiring.

What is an Engine Misfire?

An engine misfire occurs when one or more of your vehicle’s cylinders aren’t firing properly. When an engine misfires, it means that there is a problem with one of the cylinders. A cylinder is an area inside an engine where fuel and air are mixed together to create combustion.

The piston in the cylinder moves up and down, which leads to the rotation of the crankshaft, which is what powers your vehicle. When an engine misfires, it means that one or more of these cylinders isn’t firing properly.

Now that I explained what an engine misfire is let’s jump straight to P0307 Causes.

Chevy Silverado P0307 Causes

Bad Spark Plugs:

Bad spark plugs are the most common cause of a misfire. Every time you start your engine, the spark plugs fire and ignite the fuel in the cylinder. If there is a problem with your spark plug, it can cause a misfire.

According to repairpal.com Chevy Silverado Spark plugs usually last around 80,000-100,000 miles depending on how well and often you drive your vehicle. When changing your spark plugs make sure to get new ones for all cylinders because if one cylinder is bad it can cause all the other cylinders to misfire as well.

Dirty Injectors:

A dirty injector can cause a misfire in Chevy Silverado cylinder 7. If your injectors are clogged with carbon deposits from excessive fuel consumption, they will not provide an adequate amount of fuel to the cylinders when they need it most (during acceleration).

This will cause rough idling and poor performance while driving at highway speeds. You may also see white or blue smoke coming out of your exhaust pipe when this happens, which indicates that there is too much-unburned fuel in the combustion chamber during acceleration periods or idle periods when the engine isn’t under load (such as at stop signs).

Active Fuel Management System Malfunction

The Active Fuel Management System (AFM) is designed to save fuel by turning off cylinders when they’re not needed. This can cause a misfire on cylinder 7, as it does not have an ignition coil for the spark plug in this cylinder. If you believe this is the problem, try turning off AFM in your vehicle’s computer system and see if the misfire goes away.

Bad Ignition Coil:

The ignition coil is responsible for generating the high voltage that is required to spark a fuel mixture in the combustion chamber.

If your vehicle’s engine starts misfiring under load, this could be an indication that one or more of your ignition coils are bad. You can test them by disconnecting them from their wires and pushing them back and forth with your finger; if they don’t move easily then they’re probably bad.

Can you drive with a cylinder 7 misfire?

Yes, you can drive with a cylinder 7 misfire. However, it is not recommended because the engine will run rough and consume more fuel and you will notice a decrease in power. The car will not accelerate properly, but it won’t go into limp mode either. but will put more strain on your Silverado’s engine.

How to Fix P0307 on a Silverado

If you have a P0307 code, the first thing that needs to be done is to verify that all of the spark plugs are in good working order and are properly gapped. If any of them are damaged, then they will need to be replaced with new ones.

It’s also possible that the spark plug wires may be damaged or corroded at the coil pack connection point or where they connect to the spark plug itself. Replacing the coil packs and cleaning the injectors will do wonders as well.