Question about 2002 GMC Envoy

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Engine reduced power

It losing power and when i use the cruise control it doesn't come on

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Reduced power can be a multitude of things. Find out what code is present by using a scanner. The cruise control WILL NOT work if the check engine light is on. Once the check engine light is cleared, the cruise control will work again.

Posted on Jan 13, 2014

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Posted on Jan 02, 2017

SOURCE: The engine light in the 2004 Envoy stays on and the reduced engine power light

You may need to find a different shop

Nothing showing up, is about as common
as any vehicle coming into a repair bay

They know you won't pay diagnostic time or believe
anything your told,so they sent you on your way

Posted on Jun 22, 2012

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1 Answer

While driving hit resume cruise control and the car speed up to 100 and brakes would not work. Had to shut engine off in middle of freeway, what could it be?


Could be a faulty cruise control servo activator. The power to move the cruise control Actuator is most likely coming from the Brake power hydraulic booster vacuum pipe and if the cruise control vacuum servo is failing and leaking in air you lose the brakes power hydraulics.
check the vacuum pipe coming off the power booster brake master cylinder vacuum pipe you may find a tee connector in the vacuum main pipe and follow it to see where it goes to. Could be a break in the cruise control vacuum hose but if it is only happening when the cruise control is activated a fault or leak in the cruise control servo device is the main suspect. Which you should find at the other end of the cruise control vacuum hose.

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Sometimes my reduce engine power comes on I lose power if I turn the truck off for 15 seconds it goes off and runs good


How many miles does it have on the odometer ? The reduce engine power has to do with the ETC electronic throttle control . May have TPS - throttle position sensor problem or the APP sensor . 04 Silverado REDUCED ENGINE POWER Case Study Part 1

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2003 Chevy Trailblazer engine power lose light come on


Hi Steve , your vehicle has electronic throttle control . I don't know if you are aware of this. The gas pedal have position sensors an a wiring connector with 4-6 wires .these wires are connected to the engine computer . an there is a electric motor on the throttle body assembly , the computer opens an closes the throttle . You probably have codes stored in the engine computer .
Reduced Engine Power Mode When the PCM detects a condition with the TAC system the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.

?€¢
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.

?€¢
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.

?€¢
Forced idle mode--The control module will perform the following actions:

-
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.

-
Ignore accelerator pedal input.

?€¢
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.

Drive by Wire Function and diagnostics by Wells

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1 Answer

Throttle position sensor problems


reduced engine power has to do with the electronic throttle control or drive by wire . All electronic wires under the dash on the gas pedal , electric motor on the throttle body . DTC'S - diagnostic trouble codes stored in the computer . Take it to the dealer .

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My Cadillac sts 2005 4.6 cruise control doesn't


Cadillac has a cruise control system that becomes disabled when there is a fault in either the suspension, abs, traction control, or engine management system. The car needs to be scanned to find the cause

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1 Answer

A/c will work sometimes, when it doesn't work my cruise light comes on and the security light is on


may need a body control module wich needs to also be programed to car by the dealer

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What does engine power reduced mean? hhr 2006


It reduces power to protect from engine damage. I have had this happen twice because I accidentally hit the back of the gas peddle up when I was in cruise control. It will reset once you drive in reverse. If that does not resolve the problem you might have to take it in for service.

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My 2011 Sonata cruise control stops working going down steep hills. The set light goes off. I had it set at 50mph but applied brakes when it increased to 70mph. Dealership says they can find nothing...


going down steep hills will all but over ride a cruise control, since the motor is trying to keep the vehicle slowed to what your desired speed that you set , unfortunately this doesn't always work,, as your speed increases, the motor can't keep the speed reduced, when you apply the brakes, the system shuts off, cruise controls were meant to be used pretty much on long flat surfaces with Low inclines ,,

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