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: truck will start and run for 20-30 seconds and then dies

Hi there. In some cases, a mass air flow sensor or EGR valve can become clogged with excessive carbon build-up, which creates a restriction in the air/fuel mixture and can cause the engine to shut down shortly after initial ignition....

Q: My code reader says I have a bad mass air flow sensor ans crank shat sensor test drive ran better shut off & engine Lt. Same code

Hi there. The problem you are describing, sounds like you may have a poor connection in the connector at the mass airflow sensor. Although, sometimes aftermarket parts do not perform as well as factory (OEM) parts. Check for corrosion and/or...

Q: I think my ignition switch is gone.

Hello. From what you describe it would appear that your vehicle is experiencing more than one issue. If your key won't turn then it may be possible that the ignition lock cylinder or switch are bad and need to be...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.