How do you turn on high idle 2021 Duramax?

To activate the high idle, turn your switch into the ON position and switch the cruise to the ON position. This should result in an idle of 800RPM. Press the SET button on Page 3 the cruise and the RPM should climb to 1200. Slide the switch to RESUME and the RPM should be at 1800.

Where is the fast idle switch on a Duramax?

The manual fast idle switch is operated using the cruise control buttons on the left side of the steering wheel. . The parking brake is set. . The brake pedal is not pressed.

How do you set the fast idle on?

For the variable fast idle, press and hold the accelerator at the desired RPM, then press and release the cruise control switch to set the desired idle speed. When the fast idle is active the Driver Information Center (DIC) will display “FAST IDLE ON”. Pressing the brake. Selecting the Cancel button.

How does the preset fast idle switch work?

For the preset Fast Idle, press and release the cruise set switch. This will set the preset fast idle speed. For the variable fast idle, press and hold the accelerator at the desired RPM, then press and release the cruise control switch to set the desired idle speed.

What is the high idle switch on a Silverado?

The High Idle Switch, also known as the “Fast Idle System With Switch” in the manual, is described on page 2-25 of my 2008 Silverado manual. What manual do you have? The quote above is a direct copy of that information. I will be interested to learn how yours works. My truck came without the HIS even though I ordered it.

The manual fast idle switch is operated using the cruise control buttons on the left side of the steering wheel. . The parking brake is set. . The brake pedal is not pressed.

Is there an option to turn high idle on?

The DIC has an option to turn the High Idle ON but it does not appear to allow any manual setting. It may be active during cold weather but with no user controlled function. Check it out and let us know if it is working for you. Thanks.