Here’s the throttle body relearn procedureġ) Start the engine and let it idle in park for 3 minutes. It will eventually learn it on its own, but it may take over a week of driving, during which time you will experience high and low idle speeds and possibly rough idle. If you don’t do a relearn procedure, the PCM will “hunt” for a new baseline idle. If you replace the throttle body, the PCM won’t know and will continue to use the adaptive settings as if the carbon buildup is still in place. But when your battery goes dead or you disconnect it to work on your vehicle, the PCM “forgets” the adapative home position. If the buildup occurs gradually, the PCM “learns” the new home position. Over time, carbon buildup can accumulate around the throttle plate, changing it’s “home” position. A motor and gear reduction set inside the throttle body opens and closes the throttle plate to accomplish your request. The pedal simply provides an electronic signal, telling the throttle body how much acceleration you’re requesting. In those vehicles, the “gas” pedal isn’t connected to the throttle body by a cable. ![]() Many car makers including GM started installing fly by wire electronic throttle bodies. If you’ve replaced your GM electronic throttle body or you’ve disconnected the battery, you must do a GM throttle body relearn to establish a new baseline idle. PEDAL RELEARN OPTION SNAP ON MODIS ULTRA HOW TOMake and Model > GMC Trucks > Acadia > GM throttle body relearn procedure GM throttle body relearn procedure How to do a GM throttle body relearn procedure
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