RC Car Not Responding to Throttle

RC Car Not Responding to Throttle? Answers and Solutions


You’re ready to zoom around the race track with your RC car. You turn the throttle. But, the car doesn’t move. You don’t have to worry just because the car won’t respond to the throttle.

So why is your RC car not responding to throttle?

The most common reasons are incorrect set-up, compatibility issues, parts failures, damaged wiring, and misaligned gears. Detect your problem by the method of elimination. In case of incorrect set-up and misaligned gears, you’ll have to correct the set-up.

That’s a very brief explanation of what could be wrong and how to fix it. We will be delving into the nitty-gritty of each probable issue.

So without further ado, let’s get started. 

Why Is My RC Car Not Responding to Throttle?

A lot could go wrong with your RC car. Here’s a record of things that could go wrong. It’s essential to follow the proper sequence. Unless you might end up misusing money on unnecessary repairs. 

Compatibility Issues

Your RC car’s unresponsiveness could be caused by incompatibility. This can happen especially if you’re using an aftermarket transmitter. 


When your car isn’t responding to throttle it’s best to start from this diagnosis. Inspect the list of compatible devices for both devices. If your transmitter isn’t compatible you’ll have to change it. 

You could make your life simpler by getting a universal transmitter. Not certain which one to buy? We have got a few recommendations.

Product 1
Product 2

Uncalibrated or Busted ESC

The ESC tells your RC where the neutral, full throttle, and maximum breakpoints are. If your ESC is broken or uncalibrated your RC will not function. 


First, test the ESC with a multimeter. In case it’s broken, change it. If it’s not broken it might not be calibrated properly. 

To calibrate your ESC press the switch and wait till the light turns solid. After that, squeeze the trigger on your transmitter for max throttle. Hold it at max throttle till you hear a confirmation beep. 

Once you hear the confirmation beep, let go of the throttle and go for a max break. Switch to neutral after the confirmation and repeat the process.

When setting up max throttle and break, be quick about it. Don’t pause in between. 

Bad Wiring

This one is the easiest to diagnose. Just trace all the wires from end to end. Tug on the wires lightly to check if they are loose. 


If any wires have come loose, reconnect them. You might also want to re-solder some wires. If you don’t have a soldering iron you should think about purchasing one. But look for soldering irons that work best with RCs

Deteriorated Battery 

Without the batteries providing enough juice your RC won’t be doing much of anything. So, make sure they are charged and in good condition. 


Batteries with any signs of physical wear should be immediately replaced. You can also use a multimeter to check the battery if there’s no substantial impairment. 

Worn Out Throttle Servo 

Swap the servo plugs around on the receiver. Now try squeezing your trigger and using the steering too. If the steering responds but the throttle doesn’t, then you have a bad throttle servo. 

This process is a swift and easy way to check for servo damage. But, you should also consider buying a good servo tester.


The best bet is to buy a new servo motor. However, you can try opening it up to replace damaged parts.

First, flip your servo motor and unscrew the four screws. Next, take the top off and examine the gears. If any of the gears are broken or damaged in some way you’re in luck. 

Broken gears can easily be changed. Just check the parts number on your servo. Then order parts for it from your preferred website. The parts will come with detailed instructions along with visuals. 

Follow those instructions to replace the gears and make your servo functional again. However, if the gears aren’t busted then the problem is probably electronic. In that case, you’ll have to substitute the motor.

Damaged Motor

This should be the last stop. If everything thus far is in perfect condition, then your motor might be the issue. However, before you stamp it as damaged you should try a few more things. 


First of all, try cleaning the motor. A gunked-up motor might not work correctly. Sprinkle some WD40 into the motor and then use compressed air to wash it. If that doesn’t do it try opening up the motor. 

But open up the motor only if you’re technically handy. Check the ball bearings by turning them manually once you have access. If they are damaged you can replace the ball bearings and try again.

Next, check if the magnets are misaligned or damaged. If they are, you’ll need to secure them in place with glue.

However, all of this is complex and would require some mechanical know-how. It’s, therefore, advisable to purchase a replacement. 

That’s it from us. Points in here cover almost every reason an RC car wouldn’t respond to throttle.


Question: Can I charge a dead LiPo battery?

Answer: Yes, you can, it hasn’t been dead for too long. Attach the battery to a charging pack, and select NiCd. And charge it till it reaches around 10V. After that, switch it back to LiPo and keep charging. Do not charge a dead battery unattended.

Question: How to maintain a LiPo battery properly?

Answer: Keep your battery disconnected from the ESC when the RC is not in use. And don’t charge your LiPo battery with a NiMH charger. 

Question: How can I make my servos last longer? 

Answer: Make sure your servos are calibrated and aren’t extending beyond the limits of your RC. This could overheat the servo and wear it out prematurely.


An RC car not responding to throttle can have a wide range of internal issues. Reading about the issues online could overwhelm you. But, if you go about the diagnostic process in an orderly fashion it’ll seem easier.

However, if you can’t figure it out, consider taking it down to your local hobby shop. 

That’s all from us. Hope your car is now ready for the tracks.

Leave a Comment

Your email address will not be published.

Scroll to Top