Q: Reduced engine power warning on, power loss, RPM decrease - 2005 Chevrolet Suburban

asked by on September 21, 2016

My car has gone 152,000 miles and has an automatic transmission. The other day I was driving on the highway at around 45 mph. The dashboard started showing the reduced engine power light illuminated. Suddenly, the car began to lose power. I looked at the tachometer and the RPM was around 1100 and wouldn't increase. What might be the problem?

Loss of power Inspection $79.99 - $89.99 Get a Quote

It is possible there is an issue in the electronic throttle control system. Faults need to be read out of the engine computer to determine if this is the case. Accelerator pedal position sensor, throttle position sensor, or throttle motor output could all be causes for the engine to go into what appears to be a failsafe mode. You may want to enlist the help of a mechanic, such as a certified technician from YourMechanic, who will be able to read out faults and correct this loss of power issue.

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

Steaming of the engine

Hi, thanks for writing in. Codes P0107 and P0122 could show up for several reasons, such as a faulty mass air flow sensor. If you would like help, consider having an expert automotive technician from YourMechanic come to your home...

new key and theft deterrent module

Unfortunately, I believe on GM vehicles the key and the theft deterrant module both require programming from the dealership. I am also pretty sure that these are two separate procedures and therefore my cost more for labor. Without the proper...

Check Engine light on. Would the computer give all error codes in one shot? How do we know the engine's condition?

Hi there. From the description you have provided, I'm am inclined to agree with your assessment of a used engine being installed in your vehicle. An inspection of the engine, by a qualified technician could determine whether the engine is...

Coolant depletes quickly

The temperature gauge issues may be the result of a faulty coolant temperature sensor or a low coolant level. If there is no coolant in the system, the sensor cannot read temperature accurately. It would be best to consult the...

2002 s-10 4 wheel drive question when you press 4 wheel drive button either hi or low it blinks once and goes back to 2 wheel dri

Check to see if hose hooks to the air cleaner assembly? As far as the 4x4 not shifting you may have a transfer case not shifting internally and will cause the problem. Have a mechanic like one from YourMechanic check...

Getting a Check engine light and codes

These codes are related to intake air ports not opening and closing at proper times. This can be related to carbon buildup inside the intake, a vacuum leak, or a faulty electric solenoid depending on the setup. I would start...

The car won't start unless it sits for over four hours

Hello there. A few possible faults could cause this type of intermittent no start condition. The most common would be a battery, starter, battery cables, fuel pump, fuel injector, or a wiring issue. This type of failure indicates a fault...

What does the Manually Close the Power Liftgate message mean?

The Manually Close the Power Liftgate message can appear on your driver information center (DIC). When the DIC displays this message, it means that there is something obstructing your trunk and keeping the power liftgate from functioning.

Went too long without oil change and started hearing metal clanking noises. What should I do?

Hi Delmy. Thanks for contacting us today. The truth is, without removing the valve covers and inspecting the internal engine components, there is no way to be 100% what damage has occurred and what repairs are needed. When you have...

Related articles

Symptoms of a Bad or Failing Air Charge Temperature Sensor
Common signs include a lack of power when accelerating, trouble when starting in cold weather, and a decrease in fuel efficiency.
The Best Used Cars to Buy If You Love Road Trips
If If you love to travel, comfort is very important in a vehicle. You want a nice, quiet ride, comfortable seating, and enough room. We have evaluated several used vehicles, and narrowed our favorite road trip vehicles down to the...
2012 Ford F-150 vs. 2012 Chevrolet Silverado: Which One Should I Buy?
When you’re ready to really get some work done, there’s nothing like a full size pickup truck. These trucks are ready to haul a big load and really get in there and get busy. SUVs are great for moving people,...