2003 Silverado 2500HD REDUCED ENGINE ...
LEONARD

Sugar Land, TX

#62 Mar 20, 2013
MY PROBLEM STARTED AFTER INSTALLING A PERFORMANCE CHIP. TOOK IT TO THE AUTO PARTS STORE TO CHECK CODES AND HAD 4 DIFFERENT ONES NEED TO START AT THE ROOT CAUSE WHICH IS WHERE I HAD TO SPLICE TO CONNECT THE MODULE CHIP. MY 2003 2500 HD HAS 175,000 MILES BUT STILL HAS STRONG ENGINE JUST NEED TO FIX THIS MINOR PROBLEM

Since: Jan 07

Location Shown

#63 Mar 20, 2013
type in all caps, thats why it will not run
just_10

Houston, TX

#64 Apr 23, 2013
I had the same hair pulling problem,and fought with it for a long time, it ended up being my speed sensor mounted on transmission tailhousing i know it seems out of the box but check yours hopes this helps.
groovy ness wrote:
I have a Chevy Silverado 2500HD with a 6L gas motor with a automatic transmission. I have had an on going problem with the check engine light coming on followed by a REDUCED ENGINE POWER display. I have replaced the throttle body, had the wires re-connected and shrink-wrapped to the throttle body. I have replaced the PEDAL POSITION SWITCH. I still have problems with the engine shutting down and loss of power. I have to pull over and turn the motor off for a while and restart it only to have it happen again. I know I am not the only one with this problem. I think it is design flaw. I think the wires are too small and have too many poor quality connectors throughout the wire harness. If you know how to fix this problem, Please help me. My truck is my tool box for work! I have herd that many people have taken their trucks to the dealer only to have this problem return after heavy expenses. Can we get Chevrolet to acknowledge this problem and help us?
Backyard know it all

Canada

#65 Apr 30, 2013
Truck is a 03 gmc ! 6.0L truck went retarded on me when driving ... Just washed the engine bay 5 hours befor it went ... Brought it to my local high school plugged in the computer and wa told it was the throttle / pedal sensor ... Unplugged the coneconter and looke over an cleaned ! Fired up worked ever since !- just gos to show ! Check the plugs in by taking ten full apart ! As the purple conector was holding water in and Casuing a shortage
LEONARD

Sugar Land, TX

#66 May 1, 2013
YOU'RE TOO FUNNY BIG TIME
Chevy

Racine, WI

#67 Jun 14, 2013
Ron h wrote:
I went to the GMC dealer with my 2003 Chevy 2500HD pickup and ask them to flash the computer and run diagenostics all to find a short in the Throttle body. I had the throttle body replaced and now the truck runs better than new. I feel having the computer flashed is an answer to the problem which I found out there is a tech bulletin to have this done. I have had the throttle body replaced three times in the last two years. I think GM should compensate me for those parts which totaled over $1,200.00
Where did you find the short was it in the actual throttle body or in the wiring harness
DJ630 Grimmer

Livonia, LA

#68 Jun 17, 2013
I have a 2008 silverado 1500. I came home the other night the truck was ok. Got up the next day went out to go uptown and the thing would start for acouple of min. and die. tried to restart it and nothing. I got a reduced power light. about 15 min. later I tried to restart it. the same thing hppened only this time I got a truck hot indication and ws told to idle engine, only by now it hsd once again it had died. Have no problem, could use some help like the rest of all of you.
Jon

La Quinta, CA

#69 Jul 1, 2013
Check your oil?
Thats what happened to mine
Oil was a little to low half a quart later it was fine
cigar1

Springfield, NJ

#70 Jul 5, 2013
2003 gmc hd 2500 . Replaced throttle body and harness, tps and harness, tac.module, checked grounds , had computer flashed...AND STILL GET REDUCED POWER ....what next ?!
cigar1

Springfield, NJ

#71 Jul 5, 2013
Just_10, you were getting reduced power from speed senor ? Did you experiance all the problems with trottle body codes too ?
cigar1

Springfield, NJ

#72 Jul 5, 2013
Just_10, did your codes pop up throttle body too before you replaced speed sensor ?
Deanthemachine

Seward, AK

#73 Aug 14, 2013
Tim L wrote:
I got a 03 Chevy HD gas burner 6.0 a year or so ago replace everything to do with the front end all new breaks plugs wires shocks battery throttle accurater pump two fuel pumps new oil everything now it is not revin up the rpms are low it dies while driving spits an spuders until it shuts off Idk what it is can anyone help I'm sick of putting money in it.
Had same problem, remove the throttle body and clean bore and butterfly with a brush and solvent. Be sure to clean the edges of the butterfly. Mine would not hardly idle, stall etc.
World of difference for 20 minutes of work.
kevin

Vancouver, Canada

#74 Aug 16, 2013
i have same truck 6.0, my truck is at almost 400 000kms (about 250000miles) . i had same power loss and high temp. replaced thermostat and battery (cause mine was done) once reconnecting battery after having unhooked all day, problem continued for about 15-20min while idling and about 3 trips around block... never prob since. truck runs great and has been ABUSED over the yrs.
Ice

Los Angeles, CA

#75 Sep 2, 2013
Same dam problem on a 05 chevy
Dennis

United States

#76 Sep 9, 2013
I have a 2003 Chev Suburban with 185000 miles. I am having the same problem with the reduced engine power showing on the dash assembly. I have replaced the throttle body once and it helped for about 3 days then it started doing it again. If I turn the engine off and wait for a couple of minutes sometimes I can get the engine to run without the loss of power. I just bought another throttle body to install but I think I am going to hold off since I think it will be a waste of money and time. I am in on the law suit.
binmohd dxb

Dubai, UAE

#77 Oct 18, 2013
groovy ness wrote:
I have a Chevy Silverado 2500HD with a 6L gas motor with a automatic transmission. I have had an on going problem with the check engine light coming on followed by a REDUCED ENGINE POWER display. I have replaced the throttle body, had the wires re-connected and shrink-wrapped to the throttle body. I have replaced the PEDAL POSITION SWITCH. I still have problems with the engine shutting down and loss of power. I have to pull over and turn the motor off for a while and restart it only to have it happen again. I know I am not the only one with this problem. I think it is design flaw. I think the wires are too small and have too many poor quality connectors throughout the wire harness. If you know how to fix this problem, Please help me. My truck is my tool box for work! I have herd that many people have taken their trucks to the dealer only to have this problem return after heavy expenses. Can we get Chevrolet to acknowledge this problem and help us?
>>>>> i had same problem >>>>> I did what you did finally i got the problem which is the earth wire need to be cleaned or replaced .... no message since cleaned .... goo luck ^_^
binmohd dxb

Dubai, UAE

#78 Oct 18, 2013
If stil message comes check the brown wire which connected to the throttle maybe loose ..... *_^
BenP

Moncton, Canada

#79 Oct 29, 2013
had the same problem...engine light on and lost of power on my 2003 silverado 6.6L diesel. I solved the problem by cleaning the fuel(gas) cap to have a tight fit and prevent any air going to the fuel tank. cost $0.00...at worst you could get a new fuel(gas)cap.
woody

New Braunfels, TX

#80 Oct 31, 2013
I have the same problem and found the problem to be the throttle position sensor wiring harness was chewed by a dang squirl.
road king wrote:
<quoted text>
with computers onboard now the backyard mechanic is a thing of the past.....but maybe someone out there has an answer.
do you own the truck outright?
if so ,trading it in on a reliable truck is an option.
i drive a carburated non computerized truck even though i can afford a new truck....i own a $30,000 dollar harley vrod,so money is no problem....but i don't like computerized fuel injected vehicles that i need to rely on for work.i've owned my current work truck since 1985,the last non computerized and non fuel injected model year.
options for me would be ;
1] trade in your current vehicle for a "hopefully" more reliable one.
2]find an old truck thats been restored, or in great running condition.....try "ebay motors".
Braden

Calgary, Canada

#81 Nov 9, 2013
I agree with mark.. Fuel sucking hog.. I did fuel pump, knock sensors/harness, a couple other sensors, TWO GIAGE CLUSTERS!!!, heater module and motor, ect,ect... The reality is that most of us with these problems have around 2003 trucks.. Which are now 10 years old.. I work on oilfield truck for a living and see the same shit over and over with electronic component failures.. I guess if you really don't want to deal with these problems, you could always buy a pedal bike? But for most of us.. We work to pay for our vehicles..

Tell me when this thread is updated:

Subscribe Now Add to my Tracker

Add your comments below

Characters left: 4000

Please note by submitting this form you acknowledge that you have read the Terms of Service and the comment you are posting is in compliance with such terms. Be polite. Inappropriate posts may be removed by the moderator. Send us your feedback.

Top Stories Discussions

Title Updated Last By Comments
News Plurality of Americans think Trump is failing (Mar '17) 5 min Nutsos Nemesis 42,512
News Roman Catholic church only true church, says Va... (Jul '07) 11 min kent 690,609
Prove there's a god. (Mar '08) 44 min Gabriel 989,873
Why are Europeans a race of savages, thieves, a... (Jun '15) 1 hr im fair are you 157
beware! there is major health insurance fraud h... 2 hr Freakenstein 2
our STORE is starting on politics 2 hr Freakenstein 5
Bring the jobs back to the USA! 3 hr Big Al 646
More from around the web