Question about 2002 GMC Yukon Denali

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Engine light says Reduce power - 2002 GMC Yukon Denali

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This is most likely related to one or both accelerator pedal sensors. Communication between the two is not sufficient, causing the reduced power indicator light. One or both sensors will need to be tested and/or replaced. You can check the connections at the throttle and at the top of the accelerator pedal for a loose or corroded connection.

Posted on Jan 02, 2011

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I have had this problem, in the past on trail blazers with the 5.3 liter the throtle body sensor was the issue on both times. today i had the same experince on a denali 6.0 liter i was unable to scan the code but i did loose power and the dash said lose of power so i am assuming that its the throtle body once again. So that tell me that gm may have a bit of a problem with them, considering i have had this problem 3 differ times with 3 differ yrs.. i am a full time ASE tech i am posting this to maybe help with information on this ongoing GM issue

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

baccardo
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SOURCE: reduce power and check engine lights on

reduced power usally points toward a gas pedal to throttle correlation meaning the drive by wire system is where the problem is

Posted on Apr 18, 2009

abauto
  • 353 Answers

SOURCE: why does reduce engine power light comes on chevy

That is a hard problem to pin point without knowing what codes the computer has stored. It can be any number or sensors or engine problems.

You can go to most auto parts stores and they will pull the codes for you for free.

Posted on Jul 27, 2009

  • 396 Answers

SOURCE: reduce engine power 2007 chevy uplander

Sopunds like the computer has gone into a limp mode. You need to take it in for a professional diagnosis.

Posted on Jan 16, 2010

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1 Answer

Check engine light came on then reduce engine power


When this light comes on it means the computer control module has detected a fault in the system, it has reduced power to avoid any damage to the engine or transmission. You must now have the computer scanned for fault codes, this is done through the diagnostic connector under the dash see photo below.
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What does it mean when my reduce engine power light come on


Not sensor , SENSORS ! This message reduced engine has to do with the electronic throttle control !
Throttle Actuator Control (TAC) System



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Reduced Engine Power
Refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 3.6L or Throttle Actuator Control (TAC) System Description in Engine Controls - 3.8L
TAC System Default Actions/Reduce Power Modes
There are 2 reduce power modes that the engine control module (ECM) can default to if an error is detected in the throttle actuator control (TAC) system. If an accelerator pedal position (APP) sensor 1 or APP sensor 2 circuit fault, throttle position (TP) sensor 2 circuit fault, or if a TP sensor 1 circuit fault is detected with some APP angle, the ECM goes into one of the 2 reduce power modes. In this mode, the engine torque is limited so that the vehicle cannot reach speeds of more than 100 km/h (60 mph). The ECM remains in this reduce power mode during the entire ignition cycle even if the fault is corrected.
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My wife has a 2001 chevy taho and I just replaced the throttle body , we keep gettting a reduce engine power light and a service engine light. I changed it out an then the problem came back after I


I would like to know WHY you had to change the throttle body? who gave you the idea that reduce engine power has to do with the TBody and one last thing what is the trouble code now? Reply.

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My service engine light has been coming on for a while and now I was stopped at a light and my car killed the light Reduce engine power light came on what do you think it is?


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Reduce engine power 2007 chevy uplander


Sopunds like the computer has gone into a limp mode. You need to take it in for a professional diagnosis.

Jan 15, 2010 | 2007 Chevrolet Uplander

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Service engine soon light, service light, reduce power etc.


It is most likely the Throttle Position Sensor has gone bad. But if the check engine light is on, the only way to tell exact problem, is to have a scanner placed on the vehicle to have the codes read.

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Reduce power and check engine lights on


reduced power usally points toward a gas pedal to throttle correlation meaning the drive by wire system is where the problem is

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