Skip the auto shop - Our mechanics make house calls

Q: Reduced Engine Power Light is on - 2006 GMC Sierra 2500 HD

asked by on

Reduced Engine Power comes on when entering expressways but dosent happen during city driving. After pulling over and shutting truck off for 2 mins I'm able to go again and eventually the engine light will go away as well.

My car has 210000 miles.
My car has an automatic transmission.

Hello. Reduced engine power is commonly caused by fuel flow restriction issues or fuel/air mixture problems. Some of the components that could be dirty or faulty include the fuel injectors, the throttle body, or the EGR system.

The best way to know for sure, especially if the Check Engine Light comes on, is to have a professional mechanic, such as one from YourMechanic, complete a Check Engine Light inspection to determine the exact issue.

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!
  1. Home
  2. Questions
  3. Reduced Engine Power Light is on - 2006 GMC Sierra 2500 HD

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: Idles fine when reving the engine it makes a popping noise back fire from tail pipe

The backfire can be can be caused by a few possibilities. From what you've described, about the popping out of the tailpipe, you either have excessive amounts of air getting into the exhaust, a bad exhaust valve, or a spring...

Q: duramax running crappy in cold weather

Hi there. In most cases, when an aftermarket tuner is utilized, traditional OEM diagnosis of problems is extremely difficult; since they impact both electrical and mechanical fuel, and ignition systems. Your best bet is to have a professional mobile mechanic...

Q: Sunroof not working

There are a few possible reasons for your sunroof not to work. The most common are the sunroof motor and switch. I would have the motor and switch checked to see if they are getting power. I recommend seeking a...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...