Question about 2003 GMC Yukon

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I have a 2003 gmc yukon truck reduced engine power and engine light on dash

Drive 25 mph

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  • 61 Answers

I had the same issue, it ended up being the gas pedal sensor. Try a new one

Posted on Nov 06, 2012

  • irene Dec 23, 2012

    thank you, ill try that. i had my abs brake module replace and still does the same thing, so ill try the gas pedal senor. lets see what happens thanks so much.

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Posted on Jan 02, 2017

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SOURCE: 2003 GMC throttle position sensor

I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.

Posted on Mar 17, 2009

  • 2 Answers

SOURCE: 2001 GMC YUKON REDUCE ENGINE POWER ON MESSAGE BOARD

The following is a post from another site. I had the same problem and this worked for me.

Hello all,

I just wanted to share with everyone with the problem that I had withmy 2003 1500HD Crew Cab with 6.0 Liter. My truck would go into reducedengine power off and on. Sometimes one a week, sometimes 5 times on a20 mile trip. My problem was a broken wire on the plug in going in tothe throttle body. In the picture is the plug in that had caused me allof my pain and grief....... My problem was very intermittent and washard to diagnose. I started vehicle and with all codes clear. I wiggledthe wiring harness in the picture and vehicle spit and sputtered,throwing it into reduced engine power mode, and then smoothed out to asmooth idle. I disconnected the plug and pulled wires out of plug endand found a broken wire. Mine was a brown wire with white stripe. BUT,what was interesting, was that this vehicle had apparently had the smaeproblem with previous owner, becuz there was another wire (yellow wire)right beside the one that I found broken already soldered up and tapedfrom where it had apparently happened before. This was my problem andnot my truck is running great, and actually even idles better thatbefore. Hope this helps with any problems that anyone else is having. Iknow this problem can be very irritating.

http://i184.photobucket.com/albums/x191/bunchtst/BrokenWire.jpg




Posted on Mar 26, 2009

  • 67 Answers

SOURCE: What does reduced engine power light mean

this model has what they call fly by wire.. no accelerator cable. If the computer detects a problem in the thottle system it will not allow the engine to accelerate and will show reduced power and possibly set a check engine light. The dealer usually wants to replace the throttle assembly which is very expensive and usually un nessesary.
I have had a lot of succes with just cleaning the throttle plates real good.

Posted on Jul 08, 2010

nighttrain_r
  • 444 Answers

SOURCE: I have a 2003 Envoy- GMC. Why does the reduce engine speed light come on

you need to scan you vehicles ECM, there is a trouble code stored there. depending on where you live most parts stores( such as a shucks/orielleys) will have a scan tool they will let you use if the vehicle is in thier parking lot. this should diagnose the issue, provided the battery hasnt been disconnected since then.

Posted on Mar 13, 2012

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REDUCED ENGINE POWER ON 2004 YUKON DENALI


throttle position sensor is prob. bad. unfortunately this mean replacing the throttle body

Dec 14, 2013 | 2006 GMC Yukon Xl Denali

1 Answer

I have a 2003 Envoy- GMC. Why does the reduce engine speed light come on


you need to scan you vehicles ECM, there is a trouble code stored there. depending on where you live most parts stores( such as a shucks/orielleys) will have a scan tool they will let you use if the vehicle is in thier parking lot. this should diagnose the issue, provided the battery hasnt been disconnected since then.

Mar 12, 2012 | 2003 GMC Envoy

2 Answers

Reduced Engine Power message comes on along with the engine light. It does this off and on. Sometimes it runs good and sometimes it barely runs at all. What causes this?


need to have vehicle scanned the trouble codes will be stored in the computer most auto stores offer thi service for free check ur local area there are a few hundred different codes or problems that can cause ur problems and being interment can also be an electrical connection/harness problem

Jun 28, 2011 | 2003 GMC Yukon

1 Answer

Dash light says--Reduced Engine Power


You need to have an OBII scan(fault scan) - to identify what sensor triggered computer (light) Reduced Engine Power = rig is in "Limp" mode. So you can drive it to get to repair shop.

Mar 12, 2011 | 2003 GMC Sierra 1500

1 Answer

99 gmc yukon daytime running lights dont work checked the fuse but not blown dash indacator shows it is on but are not please help


Make sure Parking brakes are fully released and then check the diode under the dash, drivers side above right foot, remove diode and shunt tyhe connection if lights lite diode is bad. These diode reduce the power by 25% and are prone to fail

Sep 10, 2009 | 1999 GMC Yukon

5 Answers

2003 GMC throttle position sensor


I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.

Dec 09, 2008 | 2003 GMC Yukon

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