Q: Car struggles to go up hills and only goes 40-60 mph depending how steep the hill is. What's wrong with my car?

asked by on

Whenever I go up a hill my speed quickly drops from around 65/70 mph to 40-55mph depending how steep the hill is. And if I try to accelerate more the car won't let me. It just remains at the same low speed. Once I am out of the hill and enter a flat road the speed goes back up to 65/70mph. Also, my check engine soon light has been on for a few years now, but mechanics I've taken it too can't seem to figure out why it is on. They just say it's a sensor but don't know which one. Despite the light being on the car has been running fine except going hills. In addition to going hills, it sometimes struggles to pick up speed quickly when entering a freeway. What could be wrong with my car or this behavior normal for this kind of car and it's age?

My car has 47000 miles.
My car has an automatic transmission.

Hi there:

Anytime a check engine light is illuminated it’s because a sensor has detected a mechanical or electrical fault that impacts the vehicle’s performance. If the mechanic you go to hasn’t completed a check engine light inspection; which means they actually download these error codes; then you should find a different mechanic who knows how to complete this basic diagnostic step. In order to effectively diagnose the source of your Nissan’s acceleration issues, you might want to have one of our mobile mechanics complete a car is slow to accelerate inspection; which will allow them to download those error codes first and determine why your Nissan is sluggish on hills.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car struggles to go up hills and only goes 40-60 mph depending how steep the hill is. What's wrong with my car?

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

Get a quote

What others are asking

Q: rattling noise when engine idles. load engine noise during acceleration like glass packed muffler

This may be related to loose exhaust parts such as exhaust mounting brackets, or potentially a bad or failing catalytic converter. As you may know, the catalytic converter has a honeycomb-like structure inside of it which helps to convert toxic...

Q: Car dies immediately I take my foot off the gas

Does your car stall when you take your foot off the gas, or does it idle too high? You state both. Either way the most common problems are: Idle control valve is stuck or is sticking Intake gaskets...

Q: Maintenance Suggestions

When you bought your car, along with the owners manual, there is a factory recommended service schedule booklet. Following the recommendations on that booklet is crucial while the car is under factory warranty. If the services the manufacturer recommends at...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...