Reduced Engine Power Warning And Check Engine Light

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38 Responses

  1. Tim Gonzales says:

    I am an ASE master certified auto technician I currently have a 2004 Silverado 2500 hd 6.0 L with a reduced engine power light the tech that worked on the truck before me replaced the harness going to the throttle body reprogramed the ecm and replaced thee tac module he also said that the check engine light was coming for a no communication code to the tac module so I hooked a lab scope and check for bus data confirmation it was talking to the pcm so are issue is intermentent I also noticed while scoping the 5 volt ref going to internal tps sensors in the throttle body I found that one 5 volt ref was being pulled to ground I was trying to find a pin out voltage test specifications but did not .so I will have to reverse engineer the system and continue diagnostics on the tac module I noticed in the wiring diagram that the cruise control module ties into the tac module when problem ocuurs I wil unplug cruise control module to see if that module was pulling down my tac module causing my bus data lines to freak out. will continue when I find fix.

  2. rose.hardin143 @gmail. Com says:

    I have a 2006 four wheel drive trailblazer it ran 13 codes it says pedal position at sensor 1-2 failed app sensor – control module throttle position- air injection system pressure sensor- air injection system shut off valve stuck- air injection system pump stuck on- engine coolant temperature sensor- oxygen sensor effective- throttle position sensor- short sensor on 5 volt circuit- air injection system pump stuck on filter air control relay- failure fuel level sending unit- engine control computer it says call Cardone at 1 888-280-8324 for flash I have the same thing everybody outside loss of power come to the stop sign it shakes and rumbles sometimes it gets going after a while and then sometimes it just slows down and go anywhere and sometimes the light on the dashboard go off and it still runs with no power an it idles quite a bit what do I do what does all this mean I can’t afford anything I can only buy one parts for each month after bill’s are paid if I’m lucky Thank you

  3. Tim in Gilroy says:

    Changed pedals sensors, throttle body is new plus upper and lower wiring harness. I’m still getting engine power reduction code. Found out engine mount was broken in half with no rubber left at all.
    Can this cause engine power reduction?
    2006 Chevy HD 2500….Thanks!

  4. Bill says:

    I went to a mechanic because my engine light came on. The mechanic told me it was the solenoid in transmission , so I told them to repair it . 900.00. The light was still on. Then he told me it was the brake light switch. Replaced that ,light still on. Can so eonehe me

  5. Mike Perrot says:

    I have a 2005 Saturn Vue SUV 2.2. 4 Cyl.and the Excelerator does not work.I can start the vehicle but when I push the Excelerator in the RPMs don’t go up.I noticed that the Excelerator pedal is do I diagnose this problem?

  6. Anonymous says:

    Hello everyone my name is Chris I have a 2006 hummer H2 ok this is what happen gas light was on got gas then got on freeway drove about 7 miles then check light and reduce engine power on dash I could not get any acceleration put hazard lights on got over to emergency lane asap turn motor off for 5mins then started engine dash still says reduce engine power put in drive max speed 20 to 25 mph any ideas

    • Terry says:

      I have a 2003 Tahoe with service engine light and reduced engine power. I’ve had two tps and two accelerator position sensors, also a throttle body and a pcm replaced and still have the same problem. The code comes as tps correlation or misconfiguration and pedal accelerator sensor. Chevy still doesn’t know what’s wrong with it and my funds are now extinct. Also ground wires changed. My car runs perfect until code comes on. Can anyone help me PLEASE..

  7. Phats says:

    Hello!!! I have a 2005 buick lacrosse 3.8 .. i was driving the other day in the rain went thru a few deep puddles of water.. later on that night my engine light comes on then the car died and said reduduced engine speed. Its started back up then dies again this time i need a jump that this. I jump the then make it like a mile samething it dies.. so the next day i reset the computer the engine light goes off and it rides fine till later that day .. engine light come back on and reduduced engine speed then it dies .. now it wont start!!!! Could it be possible the crankshaft sensor got wet or maybe the wires? What you think?? Its turning over and getting fuel but wont start… please help

  8. Florence says:

    Our Chevy dually has the reduced engine power on… and it’s constantly coming on and losing power to where the truck goes 10-20 MPH… what is the problem?

  9. Kristopher Harms says:

    2002 GMC Envoy

    Check Engine – Constant

    Reduced Engine Power w/ Throttle Restraint – Spontanious

    Throttle returns after engine restart.

    During throttle restraint vehicle does not shift into overdrive but will easily do 3k Rpm in 4th gear.

    Replace throttle body and possibly wiring?

  10. Ty says:

    I have a 2004 Chevrolet Trailblazer LS, on my way home the Reduce Engine Power light came on,what does this mean and is this expensive to repair?

  11. Julian bond says:

    I just put a motor in my 2004 Chevy Tahoe z71 I can’t accelerate and my reduce engine power comes on I’ve change the throttle sensor as well as the throttle if any one out there that can help me call 3124345530 will pay

  12. bondj133@att. net Julian bond says:

    I just put a motor into my 2004 Chevy Tahoe z71 the problem I’m having is this reduce engine power I’ve change the throttle sensor the throtter and its still not letting me accelerate and the reduce engine is still on if any body can fix this problem for me please contact me I will pay # 312 434 5530 thank you

  13. janet says:

    2005 chev silverado reduced engine light comes on … usually hot weather..hasnt done it for awhile running soon as weather warmed up it started doing it again…

  14. Shay says:

    I have a 2004 Gmc envoy I replace the throttle body with a new one that cost me $400 ..then I got a gas petal dat was $100 more and my reduce engine light came bk on…took it to get a diagnosis test any nothing come up….what is my problem

  15. Justin says:

    I have a 03 Chevy Silverado z71, I had my reduced engine power come on about a month ago when I started my truck, after shutting the truck off a few times and restarting it it went away and drove just fine. Now I warmed my truck up and when I was ready to go the truck shut off and I have absolutely no power, I ended up getting power back doing nothing to the truck but that lasted like a week, now I have no power and I can’t figure out where the bad connection is or is the issue related to the reduced engine power. Idk, any help with be great.

  16. Anonymous says:

    I have a 2006 Saturn relay 2 and recently the engine light comes on and a message that say reduce engine speed and the van slows down. What causes this?

    • Chad says:

      There can be many reasons why you lose power in your Saturn. The first step is to have the computer scanned for codes.

  17. Fred says:

    I have 2003 trailblazers an my reduce engine light come on an if I pull over an shut the truck off for about 10 to 15 teen second an start it back up the light goes off for a while. An the check engine light is staying on now

  18. Billy says:

    I have a 04 chevy silverado z71 thought I carefully rinsed my engine now when I drive just a little ways my reduced engine power comes on and the truck accelerates on it’s own until I shut it off is this part of the throttle body system as well?

  19. Jorge Ramirez says:

    i also have a 2004 gmc sierra 2500 hd and it keeps telling me to reduce engine power i turn it off for about 15 sec and the code goes away for few hours but it does have a throttle code going on.

  20. Linton Dixo says:

    I’m having the problem reduced engine power every time the light comes on my engine goes into a stall to where it doesn’t want to pick up speed

  21. jagger says:

    I have a 2006 GMC Canyon 4 cylinder engine I changed out the fuel pump once to turn on the truck the engine reduce light came on on the dash and the truck does not have power. I pushed the gas pedal and nothing what else can my truck have it never had a problem til I changed the fuel pump.

    • Billy says:

      It depends on what codes are stored in the computer. Sounds like your truck has a problem in the electronic throttle system. Maybe a bad accelerator position sensor which is part of the gas pedal.

  22. Eddy says:

    My 2005 Chevy Equinox while we were driving started showing the battery light, slowly after a lot off more warning lights came. Then my accelerator didn’t work,,then it shut-off. My battery was dead, it was replace since it had warranty, i had the alternator rebuild. Now my car starts but the accelerator moves inside the cabin, but it doesn’t due nothing in the engine.

  23. Robert De Leon says:

    I just bought 2006 4.8 Siverado and wash the engine yesterday then the Reduced engine light came on, after 15 minutes of driving and restarting then engine it went away.
    Should I worry or was the cause for washing the engine?
    Thanks Robert De Leon

  24. Ray Thornton says:

    I have a 2003p1125 GMC Yukon xl with about 143000 miles. We are getting a p1125 code and having reduced engine power. We have replaced the throttle body, app sensor, and wiring to throttle body, but code still comes up and reduced engine power. What else can we do?

    • ProTech says:

      There is another part on your vehicle which controls the functions of the throttle body and communicates with the PCM accordingly. That part is called the TAC module (Throttle Actuator Control). It is located on the firewall. That is what most likely needs to be replaced on your vehicle. It does not require any programming, so it is a part you can replace yourself.

  25. harlinwolf says:

    My s-10 pulls while accelerating..changed fuel filter but still does it. what else could it be?

    • Frankie says:

      A fuel filter would have nothing to do with the truck pulling to one side or the other. You either have a front suspension part gone bad, or a broken motor mount. Put the truck in drive with your foot firmly on the brake pedal and give it some gas. Have someone look at the engine to see if it is moving excessively.