Q: Hyundai Elantra 2017- RPM is going up and same time Speed is reducing on Highway

asked by on December 29, 2016

While accelerating rpm is moving up and speed is reducing to 80, 60 ,40 from 100 mph on highway. However after shutting down and starting it again resolved the issue at that time but would like to know what can be the issue which might have cause this.

It was running smoothly for 300+ KM on that drive and all of a sudden i felt like accelerating is doing nothing but just increasing the RPM only and speed was reducing sharply and I had to stop the car in the middle of the highway.

My car has 10000 miles.
My car has an automatic transmission.

In most cases this issue is caused by a faulty speed sensor on the transmission or a ECU glitch that should be reviewed or repaired by a Hyundai dealership. Since your car is a new model, it might be best for you to take your car to the dealership so they can determine if it’s a computer issue; which should be covered under warranty.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

My car stalls at times, yesterday the car shut off at a red light. I turned car off then back on now engine light is on.

This may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Windshield washer doesn't work

Hi there. Your window washer pump may in fact be in non-working order. Also, there is a fused wired in line that may have popped causing an open circuit. It is also possible that your window washer switch maybe malfunctioning...

Hole in gas tank

It is never good to have a hole in the gas tank. The gas tank in your vehicle is plastic so it should only be replaced with a new tank. There are some tank repair kits available that would allow...

Serpentine Belt Keeps Breaking and want to know if the Tensioner pulleys could be the cause.

Either the drive belt tensioner is binding or one of the pulleys are binding. Also, check the accessories for any binding. This is only the way the belt can break. If you still need help, I would have the problem...

Car slow down itself

If your vehicle is slowing down all by itself or having trouble accelerating, it is possible that the brake calipers on the front of the vehicle are locking up. This will cause the brakes to be applied at all times....

When replacing ball joints can you just replace the ball joints or do you have to replace the whole control arm?

The ball joint on this vehicle can be replaced separately from the lower control arm. However, on this vehicle it is also a known problem where the ball joint becomes loose inside the mounting in the lower control arm and...

Can I drive my car with a broken coolant reservoir

Hi there. You sure can drive your vehicle with a broken reservoir bottle. However, if the cooling system runs low and the bottle cannot provide the needed coolant to keep it at operating levels, then the engine could begin to...

MY MECHANIC GETS ALL ERRORS WHEN DOING A COMPUTER DIAGNOSTIC CHECK. HE THINKS IT MAY BE COMPUTER IS MALFUNCTIONING. HE CAN DO NOTH

Hi there. It is very rare for an ECU to fail completely, unless something dramatic happens to cause this to occur; such as attaching battery cables backwards or flood damage / excessive exposure to water. Unfortunately, the best way to...

misfire cylinder 2 & 3

It sounds to me that you almost have the complete problem solved. If you still have a coil connector that is broke, then I would get this replaced along with the cam sensor and crank sensors replaced. The coil connection...

Related articles

The Best Used Cars to Buy If You Just Got Your License
If If you are a new driver, congratulations on getting your license. Now, you need to think about what type of vehicle to buy. Ideally, you’ll choose a used car that isn’t overly expensive, and is reliable and safe while...
Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
The Best Used Cars to Buy If Safety is #1
Maybe Maybe you’re a parent buying the first car for your teenager, or perhaps you’re a new parent and the safety of your little one is of the utmost importance. Or perhaps you're a safety-minded individual looking to make a...