| OEM Issues Original Equipment Repairs and/or Problems |
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08-12-2007, 03:00 PM
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New Member
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2003 Chevy TrailBlazer LS EXT
Summit White 5.3L V8 2WD
Join Date: Aug 2007
Location: Cabot, AR
Posts: 1
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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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08-12-2007, 03:26 PM
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No longer with us
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2007 Chevy TrailBlazer LS
Red Jewel Tintcoat 4.2L I6 4X4
Join Date: Jun 2005
Posts: 1,531
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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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08-12-2007, 10:20 PM
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Member
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2002 Chevy TrailBlazer LT
Black 4.2L I6 4X4
Join Date: Jun 2005
Location: Springfield, Missouri
Posts: 414
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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.
__________________
Ed Bland '02 TB LT 4.2L I6 4x4 Onyx Black
"The Chassis Dyno Doesn't LIE!!!!  :
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08-12-2007, 11:08 PM
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Basic Vendor- DRL Killer
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2002 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
Join Date: Sep 2004
Location: DFW - The Republic of Texas
Posts: 2,212
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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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08-25-2007, 01:28 AM
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Junior Member
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2006 Chevy TrailBlazer LT
Black 5.3L V8 2WD
Join Date: Sep 2006
Location: Angleton, TX
Posts: 24
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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. 
__________________
2007 SSilverSStone 2wd
2002 Silverado 3500 4dr Duramax/Allison
1994 S10 355/TH400/3.73 Procharged & Fogged 
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08-26-2007, 04:32 PM
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Senior Member
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2006 Chevy TrailBlazer LS
Graphite Metallic 5.3L V8 2WD
Join Date: Oct 2006
Location: Jacksonville, FL.
Posts: 859
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Quote:
Originally Posted by Towpig
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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02 Busa 1397cc
05 ZX10R
08 Tundra DCRB 5.7
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08-30-2007, 06:22 PM
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Junior Member
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2006 Chevy TrailBlazer LT
Black 5.3L V8 2WD
Join Date: Sep 2006
Location: Angleton, TX
Posts: 24
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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? 
__________________
2007 SSilverSStone 2wd
2002 Silverado 3500 4dr Duramax/Allison
1994 S10 355/TH400/3.73 Procharged & Fogged
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09-04-2007, 08:58 PM
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New Member
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2005 Chevy TrailBlazer LT EXT
Silverstone Metallic 5.3L V8 4X4
Join Date: Aug 2006
Location: Des Moines, IA
Posts: 9
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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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03-20-2010, 04:52 PM
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Junior Member
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2003 Chevy TrailBlazer LTZ
Liquid Silver Metallic 5.3L V8 4X4
Join Date: Mar 2010
Location: Knoxville, TN
Posts: 3
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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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03-20-2010, 05:43 PM
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No longer with us
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
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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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