Why Won’t My Car Go Past 20 Mph?

The gas pedal is stuck. The gas pedal could be getting stuck due to a broken cable or another mechanical issue. If you think this might be the case, get in touch with a mechanic to check out You’re out of fuel.

Make sure your tank is full before you head out on a road trip! If it’s empty and you’re still having trouble getting up to speed, try adding some fuel yourself.

You have bad tires or wheels. If your tires are old or worn down, they may not be able to grip the road well enough to move your vehicle forward at a faster speed than 20 mph. Check with your local mechanic about replacing them if necessary.

Changing the gas filter

The gas filter is located in the tank and cleans the fuel before it gets pumped into your engine. If you don’t change this filter regularly, it can become clogged with dirt and rust, which will prevent your car from getting enough fuel to run properly. This can cause stalling or other problems with acceleration.

To get rid of this problem, you’ll need to replace the gas filter. The good news is that this isn’t too difficult to do yourself just check out our guide on how to change your gas filter for instructions.

Replacing the spark plugs and wires

When your car won’t go past 20 mph, it’s usually because of a problem with the spark plugs and wires. Examine the spark plugs and wires. They should be clean and shiny; if they aren’t and have corrosion or other types of damage on them, they may need to be replaced.

Running an engine diagnostic test at AutoZone

Running an engine diagnostic test at AutoZone is a quick and easy way to troubleshoot any issues you’re having with your car. The best part is that it’s free, so there’s no reason not to take advantage of this service!

The people who work at AutoZone are very knowledgeable about cars and can help you figure out what’s wrong with yours. They’ll also be able to tell you how much it will cost to fix the problem, which can be helpful if you don’t have much money saved up.

If your car is still under warranty, they’ll let you know whether or not the repair will be covered by that warranty. They may also be able to tell you if there are any recalls related to your vehicle, which means that the company will pay for some of the costs associated with repairing any problems associated with those recalls.

Check the Throttle Position Sensor

If your car is having trouble going past 20 mph, it’s possible that the throttle position sensor needs to be replaced. The throttle position sensor tells your car how far you’re pressing on the gas pedal and informs the engine of how much fuel it needs to produce. If the sensor isn’t working properly, this could cause poor performance, rough idling, or a lack of power when accelerating.

Check the Fuses and Wires

Check the fuses. You can find them under the hood near the battery. If one or more of the fuses has blown, replace it with a new one: it should match the rating on your owner’s manual.

Check the Battery

If your car won’t go past 20 mph, it’s possible that the battery is dead. If you’re not sure how to check your battery. If the battery is dead and shows no signs of life, then you’ll need to replace it. You can purchase a new one at any auto parts store or online retailer.

After disconnecting the negative terminal with a wrench and cleaning off any corrosion on both terminals, simply place the new battery in place, reconnect the negative terminal, and make sure all connections are tight.


If you’re experiencing a problem with your car that’s preventing you from driving at speeds over 20 mph, there are two likely causes. Check the tires and make sure they’re properly inflated. If you’ve recently had work done on your car, make sure that everything is properly tightened and aligned to prevent slippage.

If none of these solutions work, it’s possible that there is an issue with the transmission or engine that needs to be addressed by a professional mechanic.

Steven Hatman
Steven Hatman

We break down every information into easy-to-understand articles that cover all the categories anyone who owns a car needs to know about, such as oil , brakes , tires and etc. Our car guide is free and updated regularly for you to use as a resource, not only when you have an issue with your car but even before buying a new or used car! We also give tips on what to look for in each category or part of your vehicle.