Can A Bad Battery Cause Reduced Engine Power?

Reduced engine power is one of the most common issues in the car. It can be caused by many reasons.

A faulty or bad battery is one of the reasons you can have this problem. Does a faulty battery reduce the performance also? Or, should you drive when the indicator shows a “reduced engine power”?

The first thing is, a faulty battery does not reduce engine performance. But you should not drive the car and try to repair it as soon as possible, when you get an alert saying “Reduced Engine Power”.

Let’s get to the details now in below.

What is Reduced Engine Power?

Whenever your vehicle isn’t accelerating perfectly, the dashboard’s “engine power reduced” alert may highlight. It’s possible that the “check engine” light has also illuminated. 

Generally, the “engine power reduced” alert on the dashboard indicates that your vehicle’s performance has been lowered to prevent engine damage.

After detecting a system crash, your car’s computer also referred to as its “electronic control unit” (ECU), activated Reduced Power Mode.

In another word, the bright “engine power reduced” light indicates that your vehicle has reached a fail-safe mode.

This can impair your vehicle’s potential to accelerate appropriately. Even when the power of the car is not immediately lowered, its performance is perhaps limited the next time you run it.

In certain instances, the car’s ECU may even turn off all fuel supply to the engine, deeming your vehicle immobile.

What are the Signs of a Bad Battery?

We know that a bad battery can cause reduced engine power. But how do you know if you have a bad battery? Here are some ideas to check if you have a bad battery or not!

Dim Headlights:

If your car battery fails, it will be unable to entirely power your car’s electronic systems, including the headlights.

Make a note if the headlights appear to be dim and weaker than normal!

Not only is the lack of light dangerous, but it also indicates that the car battery is nearly dead.

Clicking Sound When You Run The Car:

Once you switch the key in the ignition, the car battery transmits a current to an electrical device known as the starter solenoid to start the engine.

A bad battery will struggle to perform this task, and the electrical current transmitted to the starter should be reduced.

Whenever the starter gets inadequate or no power from the battery, it frequently helps make the clicking sound you hear.


Drivers become accustomed to the noises of their vehicles.

While you turn the key, you can see that the engine cranks quite slowly or sluggishly than usual, indicating that the battery is quickly approaching the end of its life.

Don’t ignore this warning sign!

Need Help From Pedal:

You shouldn’t have to provide your car with gas to run it.

If you notice that your car only starts even before you push your foot on the gas pedal, you may have a faulty battery.


This one is a warning sign you won’t be able to ignore! Occasional sparks can be caused by a bad car battery. These scattered sparks can cause fuel to build up in the cylinders.

When this accumulated fuel is ignited, it ignites quickly and with great force, making your car backfire. Remember that backfiring can be a sign of a variety of issues, so a battery test is essential!

Can a Weak Battery Cause Poor Acceleration?

The answer to the question is no. A weak battery does not affect the performance of a car’s engine because its only purpose is to crank up and run the engine.

A faulty battery has an impact on many parts of the car, like the alternator and other components that are accountable for the vehicle’s performance.

Can a Bad Battery Cause Reduced Engine Power?

A faulty battery is a common cause of the “reduced engine power” alert. Battery cells that are damaged or dead might cause system alerts.

Whenever it is about vehicle batteries, the most familiar issue is a corroded battery. Hence, your car engine cannot run properly when the battery is bad.

What Should You do if Your car Displays the “Engine Power Reduced” Message?

When you see this sign, the first thing you should do is pull over to a safe location and perform an Onboard Diagnostic II scan, also identified as an OBD scan.

This scan notifies the driver of the issue that has prompted the warning. It examines all vehicle parameters and pinpoints the source of the problem.

All vehicles manufactured or sold in the United States of America after 1996 are equipped with an OBD II scanning feature.

If your vehicle does not possess a functioning OBD II scanning system, you must take it to a mechanic and have it scanned and eventually repaired.

Some car dealerships and mechanic shops offer free scanning and OBD services.

Can I Drive with the “Reduced Engine Power” Warning Light Illuminated?

It is feasible to drive your vehicle with the “reduced engine power” light on. Even so, this feature is defined as “limp mode,” and it is the maximum amount of time you should drive your car.

Running the car in this mode does not pose many dangers. However, the car will not be enjoyable to drive because the gas mileage will be extremely high, the acceleration will be poor, and shifting gears should be jerky at best on a few vehicles.

Furthermore, non-essential accessory elements like the radio may be disabled in some vehicles. The simple answer is that, while you can drive with your “reduced engine power” signal on, you must have your car hauled if you need to travel more than a few miles.

How can You Solve Reduced Engine Power Due to Battery Problems?

The solution to the battery issue is simple and inexpensive. It is not even necessary to hire a professional to do it. In case your battery is corroded, you should first disconnect all wires and links to the battery.

Wear protective slippers and wear the right industrial protective gloves when performing these acts.

Steps to Take:

Step 1: Clean the corroded part with moderate soap or baking soda solution.

Step 2: After your battery is clean, allow it to dry completely. Allow it to dry naturally.

Step 3: Connect the wires and the battery to the car, and you’re ready to go.

If your battery has been severely damaged, just replace it. Batteries are inexpensive and easily obtained from any auto shop. It is very simple to replace a battery, and there are numerous DIY videos available on the internet.

How Much does it Cost to Fix the Engine Power Reduced?

Nobody wants their vehicle to perform sub-optimally. The cost of repairing the reduced engine power varies greatly depending on the culprit, but the majority of fixes range between $100 and $500.

Initially, a mechanic may need to diagnose the problem with your engine. This diagnostic test will take between a half-hour and an hour to complete.

the problems should not require major repairs or maintenance. You may have to pay between $100 and $500 to have your engine back in working order, including parts and labor. However, a catalytic converter problem can cost more than $2,000.


Numerous factors can contribute to reduced engine power in the car. If the “reduced engine power” light illuminates, you should not drive your car. You can attempt to solve it yourself at home or take it to a certified mechanic.

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