Skip the auto shop - Our mechanics make house calls

Q: I have a reduced engine power light.

asked by on

I have a reduced engine power light and my truck would not accelerate at times. Once I cut it off and cut it back on it's fine. But after awhile it does it again. What could this be?

My car has 198000 miles.
My car has an automatic transmission.

A: Hi there. This light can come on for a numb...

Hi there. This light can come on for a number of reasons. It usually comes on when there is a voltage issue, but it will also come on when the computer finds a reason to reduce the power to protect the engine. I usually start by load testing the alternator an the battery. One of these is usually the issue. If these are fine then the computer should be scanned for codes to see if there is anything stored in the computer. Most of the time the issue is a failure in the throttle body. This fails and keeps the computer from being able to control engine throttle. If you need to have this warning light checked, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the recuded power light is coming on] https://www.yourmechanic.com/services/reduced-power-light-is-on-inspection

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car will not restart after running out of gas

Hi There, It sounds like you may have a faulty fuel pump that may have been damaged as a result of running it out of fuel. As you may know, today's fuel pumps require the fuel to keep them cool...

Q: Truck keeps stalling

This may be related to many different possibilities, however if the truck starts ans then stalls, it is most likely related to a fuel supply issue. This may be related to low fuel pressure, faulty or dirty fuel injectors, a...

Q: Should I replace the timing belt?

Your engines timing belt is recommended to be replaced every 90,000 miles. If you cannot find proof that the timing belt was replaced at 90,000 miles then I would recommend timing belt be replaced. This engine is an interference motor...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...