Question about 2002 GMC Envoy
Gas paddle posital sensor reduced engine power lite comes on
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
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
Removal & Installation
Detaching electrical connectors prior to TP sensor removal
Identifying components for removal of the TP Sensor
Posted on May 12, 2010
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.
Posted on Nov 07, 2010
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Mar 25, 2017 | Cadillac CTS Cars & Trucks
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.
Powertrain Control Module Description for the 4.8L, 5.3L and 6.0L engine
May 09, 2016 | 2006 Chevrolet Avalanche
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 !
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