Question about 2002 GMC Envoy

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Throttle Position Sensor

Gas paddle posital sensor reduced engine power lite comes on

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I just finished fixing my 2005 Envoy with the same problem. Your problem is most likely a dirty throttle body. If you take it to a shop they are going to want to replace it for about $500. If you clean it, you can usually fix it for less than 10. There are a couple of good videos on youtube about removing and cleaning the throttle body. Some say not to touch the butterfly inside, but you can also pull the fuses for the fuel system, or do an idle relearn procedure after you clean the throttle body so the vehicle will run properly. Basically, you can clean the throttle body with throttle body cleaner after removing the unit from the intake manifold. You will need a flat-head screw driver, a 10 mm socket with an extension to remove the vortec cover/box that covers most of the engine. There is a wire attached to the left rear corner of the box and an evap hose attached to the front left corner of the box. Then you remove the plug on the throttle body, the fuel line and four mounting bolts and the throttle body comes off. Don't use anything abrasive to clean the part--just throttle body cleaner. Also Don't drop the part. These seem to be rather delicate and using abrasives or dropping the unit will damage the coating on the inside of the throttle body. I do recommend watching the videos.

After cleaning the unit, you may need to do a throttle relearn procedure for the system to reset. look these instructions up online or call a GM dealer. You may also need to clear fault codes while driving the vehicle for the relearn procedure. It took about 20-25 minutes to remove and clean the throttle body, about 15 to reinstall it, and then 200 miles to reset the OBDII codes on the computer. My vehicle also has a faulty fuel guage wich made completing the OBD tests take longer than usual. The repair is pretty straight forward--by no means worth over $500 at a garage!!

Good luck, I hope this helps


Posted on Jun 17, 2014

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2003 GMC throttle position sensor

I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.

Posted on Mar 17, 2009

  • 218 Answers

SOURCE: How do I change Camshaft position sensor

THE CAMSHAFT SENSOR IS IN THE DISTRIBUTOR.

Posted on May 01, 2009

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SOURCE: locting the throttle position sensor on a 2003 gmc

The throttle position sensor is located on the throttle body. Which is in the front of the intake manifold.

Posted on Nov 29, 2009

c17hydro
  • 2984 Answers

SOURCE: how do you replace the throttle position sensor

Removal & Installation

  1. Remove the idle air control (IAC) electrical connector (1) from the IAC sensor (4).
  2. Remove the manifold absolute pressure (MAP) sensor electrical connector from the MAP sensor.
  3. Remove the water pump belt cover.
  4. Remove the TP sensor retaining screws electrical connector (2) from the TP sensor (3).
  5. Remove the TP sensor electrical connector (2) from the TP sensor (3).


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Detaching electrical connectors prior to TP sensor removal



6244f87.gif

Identifying components for removal of the TP Sensor


To install:
  1. Install the new O-ring on to the TP sensor.
  2. Connect the TP Sensor electrical connector (2) to the TP sensor (3).
  3. Install the TP sensor (2) on to the throttle body (1). Tighten the TP sensor screws to 2.3 Nm (20 inch lbs.).
  4. Connect the IAC electrical connector (1) to the IAC sensor (4).
  5. Connect the MAP sensor electrical connector to the MAP sensor.
  6. Install the water pump belt and tensioner cover.
  7. Perform the TP Sensor learn procedure:
  8. Turn the ignition to the RUN/ON position.
  9. Wait 1 minute.
  10. Turn the ignition to the LOCK/OFF position.

Posted on May 12, 2010

emissionwiz
  • 75066 Answers

SOURCE: Where is the Throttle Position Sensor located on a

It is located on the throttle body, it is on the other side of the throttle shaft where the throttle cable hooks up, see the picture below.




emissionwiz_8.jpg

Posted on Nov 07, 2010

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Engine power reduced means it has a problem with the electronic throttle control system . You can't reset it , has DTC"S- diagnostic trouble codes stored in the computer . Something is worn , a position sensor in the gas pedal assembly or throttle position sensor on the throttle body . Your best bet , take it to a qualified repair shop ! or the dealer .
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REDUCED ENGINE POWER - mass airflow sensor has nothing to do with this problem .
Throttle Actuator Control (TAC)
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.


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Ignore accelerator pedal input.


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




Refer to
?€¢
Powertrain Control Module Description for the 4.8L, 5.3L and 6.0L engine


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1 Answer

I changed everything on a 2007 Chevy uplander the camshaft position sensor And the purged sensor And the throttle body and still the check engine light and the reduce engine power came back on


Reduced Engine Power Mode When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.


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


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


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


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


-
Ignore the accelerator pedal input


?€¢
Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.
Did you have it checked for DTC's - diagnostic trouble code's related to the reduced engine power ?
All so has APP sensor gas pedal !
Accelerator Pedal Position (APP) Sensor
The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
?€¢
A 5-volt reference circuit


?€¢
A low reference circuit


?€¢
A signal circuit

The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases to more than 4 volts as the pedal is actuated. The APP sensor 2 signal voltage at rest position is less than 0.6 volt and increases to more than 2 volts as the pedal is actuated.
Your best bet is take your vehicle to the dealer !
al

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1 Answer

When I push my gas pedal down about one inch the reduced power light comes on it don't stall just reduced power you shut the truck off restart it the light is off ,


The reduced power light is pertaining to the TAC - electronic throttle control . Is the check engine light lit ? If not still may have a DTC -diagnostic trouble code stored . You probably have a bad TPS - throttle position sensor .
Throttle Body Assembly
The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signal, low reference, and 5-volt reference circuits are used to connect the TP sensors and the powertrain control module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.

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