How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29395
Experience:  GM Grand Master Technician 2007. 14 years experience.
Type Your Chevy Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

What can cause the reduce engine power light to come on, 2004 trailblazer LS V6

Resolved Question:

What can cause the reduce engine power light to come on, 2004 trailblazer LS V6
Submitted: 6 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 6 years ago.

Greetings and Welcome to Just answer.

In these vehicles, the Reduced Engine Power is the indication there is a problem with the throttle assembly. These engines use an electronic throttle assembly that is controlled by the engine computer and a sensor on the fuel pedal. What I suggest you do first is get your Trailblazer scanned for the code. A fault in the throttle to cause that will also have set the check engine light. IF the light is on now, then you can get it scanned at most any part store and they will do this for free. If the light has gone out, then the code is in history and you will need to get it scanned by more than just a code reader. You need to use a scan tool for this. A scan tool is very different than a code reader. Scan tools are larger, can scan and control certain systems of the whole vehicle, and usually cost about 2000+. A code reader will only read emission related codes and that limits them to reading the engine and transmission modules. Given the cost of the scan tools, it is usually cheaper to get a shop to read the codes. If they are honest, I would imagine that $20 is fair to stick the machine on and read codes.

If you reply back here with the codes I can tell you what they mean and direct you in a repair or further diagnosis.

GM Tech (Cam) and 4 other Chevy Specialists are ready to help you