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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 08-12-2007, 03:00 PM
Gerry Waddell Gerry Waddell is offline
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2003 Chevy TrailBlazer LS EXT
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Reduced Engine Power Sensor

The reduced engine power sensor on my 2003 Trailblazer keeps activating.
I have had it in the shop 5 times. Dealer has installed software updates, but
problem persists and is getting worse. They have no idea what is causing
this. Factory support has been no help. Looking for solutions.
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  #2  
Old 08-12-2007, 03:26 PM
rcam81 rcam81 is offline
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Welcome to the group. Something that you could do to help us diagnose your problem is to fill in your profile. Once you do that, the info will start flying.
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  #3  
Old 08-12-2007, 10:20 PM
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blandmiller blandmiller is offline
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Welcome to the site.

The "reduced engine power" message is not a sensor. It is a message from the PCM that some sensor(s) or operating parameters are not reporting correct information to the PCM or the sensor(s) are providing information that is causing the PCM to protect the powertrain. The problems that can cause a reduced engine power are probably too numerous to list.

Next time it happens, make sure you get the DTC codes and post them to the site. You should get many responses once you have some codes that everyone can make sense of. There are several very helpful members that can start to diagnose the problem with a little additional information.

I also agree with rcam81, fill out your profile so we all know what configuration you are driving.
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  #4  
Old 08-12-2007, 11:08 PM
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tblazed tblazed is offline
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A friend of mine had his accelerator pedal sender-resistor gizmo fail and got the reduced power light. Replaced the pedal ass'y and that fixed it. I think it set a code so you might get that checked somewhere like AutoZone who will do it free. A stored code should lead you in the right direction.
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  #5  
Old 08-25-2007, 01:28 AM
Towpig Towpig is offline
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My wife had this happen on the 06 5.3L and it turned out to be the throttle body and the ignition switch. Truck wouldn't go over 30MPH and the reduced engine power light was on. It definitely didnt protect the motor because right now it's in for a new long block.
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  #6  
Old 08-26-2007, 04:32 PM
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Nukedog Nukedog is offline
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Quote:
Originally Posted by Towpig View Post
My wife had this happen on the 06 5.3L and it turned out to be the throttle body and the ignition switch. Truck wouldn't go over 30MPH and the reduced engine power light was on. It definitely didnt protect the motor because right now it's in for a new long block.

Apples and Oranges...
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  #7  
Old 08-30-2007, 06:22 PM
Towpig Towpig is offline
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Be it the pedal or the throttle body, it is about the same. The sender or the receiver, the signal did not reach it's destination. But, I do know the computer does not shut down engine power due to signal input. It only tells you the drivetrain is not functioning properly. +/- 7-10% expectancy.

How much money would GM make if they shut down an engine due to heat or oil pressure, or had the DIC tell you exactly which sensor or part went bad?
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  #8  
Old 09-04-2007, 08:58 PM
accplu accplu is offline
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Reduced Power, engine light on

Just bought 2005 GM Buy Back loaded EXT with 25k on it. Immediately after brake controller was installed under dash, the reduced power thing happened with a check engine light on. Dealer found wiring harness under dash problem and fixed it.
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  #9  
Old 03-20-2010, 04:52 PM
sarge355 sarge355 is offline
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Reduced Engine Power

I am looking for some assistance. My 2003 Trailblazer has 63,000 miles and has been experiencing the reduced engine power problem. A GM dealer has replaced a fuel sensor, entire wiring harness, computer, and it still is occurring. The only other thing they plan to try is the accelerator assembly.

Any thoughts on whether or not this should fix the problem??? I've been a very loyal GM owner, but this experience has me reconsidering that...
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  #10  
Old 03-20-2010, 05:43 PM
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the roadie the roadie is offline
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On whose dime are they doing that INSANE and EXCESSIVE amount of guessing?

What exact code shows up in the computer when it goes into REP mode and sets the SES light?

Typically the code will point to the throttle body or the accelerator pedal. There's a TSB that it might also be chafing in the wiring harness from the PCM to the fan clutch, or a failure in the fan clutch. We're very familiar with it here on trailvoy - hard to believe the dealer isn't.
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