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Have an 03 suberban z71 today wife was driving and lost power to the pettle and overheating transmission light came on how can i fix this

Posted by Kevin Danos on


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Jeff Armer

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Check engine light come on ? Any messages on DIC - driver information center , reduced power ,if the vehicle has it . Any other lights lite , yellow wrench symbol . Do you own a scan tool ? a professional grade scan tool , not a code reader . Do you know how to do electrical trouble shooting ? Suggest you go on you tube an check out videos on electronic throttle control .
Throttle Actuator Control (TAC) System Description
The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system components include the following:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The throttle actuator control module
• The powertrain control module (PCM) .I strongly suggest you take it to a ASE certified repair shop

Posted on Feb 15, 2016

  • Jeff Armer Feb 15, 2016

    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.



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