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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29396
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2007 impala: dtc..runs rough..the throttle body are they..somewhere

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I have a 2007 impala with 3.9 i have dtc p2101 and the mil light is on and the traction control light is on the screen displays reduced engine power and when it happens it runs rough the shop told me that i needed to clean the throttle body are they right or is the problem somewhere else

Welcome. Yes GM has a bulletin for this issue, and the first thing to try is cleaning the throttle plates and relearn the throttle position. After that, if it does not work, then you may need to try something else, but this is the cheapest and best place to begin.


Customer: replied 6 years ago.
whats the process to relearn the throttle position
  • Start and idle the engine in PARK for 3 minutes.
  • With a scan tool, monitor desired and actual RPM.
  • The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
  • Ignition OFF for 60 seconds.
  • Start and idle the engine in PARK for 3 minutes.
  • After the 3 minute run time the engine should be idling normal.

    Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

    If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
  • After the drive cycle, the engine should be idling normally.
    If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
  • Once the engine speed has returned to normal, clear DTCs.
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