GM Active Fuel Management Problems- We’ve Found 3 Major Problems+ Solutions!

Are you familiar with GM active fuel management problems? Problems like excessive fuel consumption, transmission, and lift failures are the most common.

If you are a fan of General Motor trucks, then you should know that the active fuel management system is one of the most revolutionary fuel-efficient systems.

The active fuel management system mainly disables the new cylinder at lower RPMs. This system is effective on idle roads, but sometimes the power transition on this system causes various problems like lift problems. And passively, this system consumes a lot of unnecessary fuel.

We are going to discuss all of these problems in detail and discuss some more problems. We will also be giving the fixes to these problems. So, we hope that we have the answer to your query.

Gm Active Fuel Management Problems

Check out the problems and their solutions at a glance.

Immoderate fuel consumptionCheck for oil clogs and oil overflow and remove them
Transmission issuesTroubleshoot by identifying rough idling, then take it to the mechanic for a check-up
Lift failuresCheck for oil and lubricant deficiency and change oil.

In this section of the article, we are going to discuss the most common active fuel management problems and the best fix for them. We are going to specifically discuss excessive fuel consumption, minimized mileage coverage, lifter problems, and transmission issues. So, let’s start.

Immoderate Fuel Consumption

Excess fuel consumption is the most common problem in the AFM system. And also the most annoying one. By the name of the fuel management system, you can already guess that it mainly maintains and saves your fuel consumption.

But sometimes, the AFM system not only creates a path for excessive fuel waste but also damages the piston system. We told you that an active fuel management system is suitable for easy roads. But they also designed it for off-road. The only problem is that the system doesn’t work as promised on the off-road.

AFM system creates a bypass for the oil to get into the combustion chamber. Excess oil causes it to overflow. For this, oil gets clotted in the pistons. Due to hard oil residues, the pistons lose their efficiency and ultimately harm the whole engine system. The most common victims of this problem are the 2007 to 2013 chevy truck holders.

General Motors have a standard guide on the fix of the problem. If you have a warranty on them, you can fix it for free. Other than that, troubleshooting and fixing this problem is not that hard or money-consuming. Just take it to the mechanic or follow the guide given by general motors.

Transmission Issues

AFM system also affects the transmission of the car. You already know that transmission is mainly the gearbox of the car. And through this gearbox, the potential of the engine is controlled. Without the transmission, your engine will cross the redline. Redline ks the limit of rpm of an engine. If the red line is crossed in an engine, then the engine gets damaged.

We told you that an active fuel management system turns off the unused cylinder and saves your fuel economy. But actually, that doesn’t happen. Active fuel management is best for city roads. But if you are planning to go on a hike in your car, then you are making a bad decision.

AFM lets oil get past the piston system into the ignition chamber. And due to this, oil gets hard on the pistons. We told you all about it before. But due to clogged pistons, the torque of the car gets canceled. Eventually, the transmission gets disabled. And a faulty transmission can harm the engine directly.

If the damage is excess, then you may have to change your transmission completely. But before that happens, you can troubleshoot your car easily. Check if the car is idling rough in critical situations. If the car is having rough idles, then there is something wrong with the pistons. Take your car immediately to the mechanic and get it fixed.

Are you well aware of the Range AFM disabler problems? If not check out now.

Lift Failures

The main reason behind the lift failures of the car is poor quality and lack of proper lubrication. Lubrication is an important factor for the engine. Almost every movement in the engine needs lubrication. If there is no proper lubrication, then the whole system gets clogged, specifically the pistons and the gears.

Sometimes due to oil overflowing which is caused by the AFM system lifting failures occur. When overflowed oil gets clogged in the pistons, lubrication deficiency occurs. And as we told you that lubrication deficiency is the main reason behind lift failures.

This problem can be easily avoided if you take proper steps and preparation. The first check is if the oil you are using is ideal for the car. Sometimes you may be using the wrong engine oil other than the oil you were supposed to use. Get the proper oil and check if the active fuel management system is failing again.

Frequently Asked Questions (FAQs)

What is GM active fuel management?

The active fuel management system is the system that turns off the unnecessary, unused cylinder for better fuel economy.

How do I know if my chevy has active fuel management

There are special springs mounted on the engine if the AFM system is used. Also, the active fuel system has a specific camshaft.

How does GM active fuel management work?

It mainly turns off the unused cylinders on the idle roads? But it again gives the necessary power and fuel consumption on off roads according to requirements.

Is GM getting rid of AFM?

General Motors plans to eliminate the active fuel management system from the newest 2022 car lineup.

What happens when AFM lifters fail?

Faulty lifters can directly harm the engine. The main reason behind faulty lifters is a deficiency of proper lubricants.


GM active fuel management problems are a regular thing in chevy trucks. But one good thing about these problems is that they can be solved with almost no hassle. We gave you everything you need about their fixes. We also gave the specific problems that can happen along with their proper fixes. Just follow our steps accordingly, and we hope that there will be no complexities.

We tried to give the best intel we had. We don’t think that we have missed something. But if we did, you can let us know about it in the below forum until they stay classy.

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Ronald Berit

Our chief editor, working 24/7 to ensure the precise and only quality data regarding different trucks.He is mastered with the ins and outs of cargo to off-road trucks of Dodge, Ford, Chevy, Toyota, GMC and more. This truck geek graduatedwitha Bachelor of automobile engineeringdegree and practiced through his own automotive parts repair center.

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