Question about 2003 GMC Sierra 2500HD

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Where is the throtle actuator control for 2003 gmc sierra 2500 hd?

Having a reduced engine power notice on dashboard

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If this is "fly by wire" throttle, any misalignment between gas pedal and TPS will cause this issue. Failure of the gas pedal sender is so common Lokar company makes a replacement pedal unit that is much better than stock.

Posted on Jul 13, 2015

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Posted on Jan 02, 2017

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redbeard00
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SOURCE: display on dash reads

Is this a gas or diesel? Usually this is to protect an engine if there is a fault found by the truck's computer. It can be related to oil level, temp, or pressure. Could be related to the antifreeze. Check the levels. Also you said something about a headlight being dim. So You will need to check that Curcuit out as well. Could be related but a scan-tool would be needed to look a parameters.

Posted on Nov 19, 2009

  • 3763 Answers

SOURCE: Can a faulty O2 sensor cause a reduced engine power fault in a 2003 GMC Sierra 2500 hd

Yes, faulty O2 sensor will change the air/fuel ratio and although a small amount of extra fuel can produce more power, both an excess and insuffcient amount of fuel will rob an engine of power.

Posted on Feb 06, 2015

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1 Answer

Can a faulty O2 sensor cause a reduced engine power fault in a 2003 GMC Sierra 2500 hd


Yes, faulty O2 sensor will change the air/fuel ratio and although a small amount of extra fuel can produce more power, both an excess and insuffcient amount of fuel will rob an engine of power.

Feb 06, 2015 | GMC Cars & Trucks

1 Answer

2006 gmc 2500 hd sieara duramax diesal,reduced engine power light came on, what is the problem??


Unhook battery wait a few minuites reconnect battery should reset computer codes to allow you to get it to a repair shop.

May 25, 2014 | 2006 GMC Sierra

1 Answer

Display on dash reads '' reduced engine power '' . will start & run but have no throttle control, engine idles more rpm than normal, left headlight is dim, turn key off then have to turn back on for...


Is this a gas or diesel? Usually this is to protect an engine if there is a fault found by the truck's computer. It can be related to oil level, temp, or pressure. Could be related to the antifreeze. Check the levels. Also you said something about a headlight being dim. So You will need to check that Curcuit out as well. Could be related but a scan-tool would be needed to look a parameters.

Nov 19, 2009 | 2004 GMC Sierra 2500

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Problem with Diesel Fuel System. Gmc 2002 duramax 2500 HD 4x4 will start 

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2003 gmc 2500 hd turn key nothing happends


try checking your neutral safety switch.

Apr 15, 2009 | 2003 GMC Sierra 2500HD

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2003 GMC Sierra 1500 looses power at highway speeds, however the engine sounds normal


Does the reduced engine power message come on? if it does check the electric connector at the throttle body. sometimes the wires get dirty or something. and usually the yellow one.

Apr 10, 2009 | 2003 GMC Sierra 1500

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