High Idle Switch - Chevy and GMC Duramax Diesel Forum
2017+ L5P Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 34 (permalink) Old 02-24-2017, 06:17 PM Thread Starter
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High Idle Switch

Anyone install a high idle switch after the fact? I have a Denali L5P. Searched all of central TX to find one that wasn't blue and had black interior. The one I found had everything but the high idle switch and the dealer hasn't been able to find any info on installing one. From what I understand, it should be fairly simple.
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post #2 of 34 (permalink) Old 02-24-2017, 07:37 PM
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It operates using the cruise control switches, so it should be just a programming change. (like setting an enable 'bit'?)

(the 'elevated idle', used to warm the engine and trans, is standard on all 6.6L Dmaxes.)

Fast Idle System
If equipped, this feature is available only with cruise control. The manual fast idle switch is operated using the cruise control buttons on the left side of the steering wheel.
This system can be used to increase engine idle speed whenever the following conditions are met:
. The parking brake is set.
. The brake pedal is not pressed.
. The vehicle must not be moving and the accelerator must not be pressed.
To control the fast idle:
. To enable the Fast Idle System, press and release the cruise control on/off button and ensure that the switch indicator light is lit.
. Press and release the cruise control SET- button. Engine speed will be held at approximately 1200 rpm.
One of the following actions will turn off the fast idle:
. Pressing the brake.
. Selecting the cruise control cancel button.
. Releasing the parking brake.
. Moving the transmission shift lever out of P (Park) or N (Neutral).
. Selecting the cruise control on/ off button when it was previously on.
. Pressing the cruise control SETbutton a second time.
. Pressing the accelerator more than one-quarter of the way down.
. Turning the ignition switch to the LOCK/OFF position.
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post #3 of 34 (permalink) Old 02-25-2017, 02:01 AM Thread Starter
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Quote:
Originally Posted by redwngr View Post
It operates using the cruise control switches, so it should be just a programming change. (like setting an enable 'bit'?)

(the 'elevated idle', used to warm the engine and trans, is standard on all 6.6L Dmaxes.)

Fast Idle System
If equipped, this feature is available only with cruise control. The manual fast idle switch is operated using the cruise control buttons on the left side of the steering wheel.
This system can be used to increase engine idle speed whenever the following conditions are met:
. The parking brake is set.
. The brake pedal is not pressed.
. The vehicle must not be moving and the accelerator must not be pressed.
To control the fast idle:
. To enable the Fast Idle System, press and release the cruise control on/off button and ensure that the switch indicator light is lit.
. Press and release the cruise control SET- button. Engine speed will be held at approximately 1200 rpm.
One of the following actions will turn off the fast idle:
. Pressing the brake.
. Selecting the cruise control cancel button.
. Releasing the parking brake.
. Moving the transmission shift lever out of P (Park) or N (Neutral).
. Selecting the cruise control on/ off button when it was previously on.
. Pressing the cruise control SETbutton a second time.
. Pressing the accelerator more than one-quarter of the way down.
. Turning the ignition switch to the LOCK/OFF position.
Thanks for the info. Yeah, mine definitely doesn't have it. I was thinking it would be a simple reprogram but wasn't sure if there is something else needed. I may need to check with a different dealer. Does anyone use their high idle system?
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post #4 of 34 (permalink) Old 02-25-2017, 08:16 PM
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I used the high idle when I had to jump my yukon.

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post #5 of 34 (permalink) Old 09-12-2017, 10:30 AM
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old topic but I am also curious about this. I have a 17 Silverado 3500 LTZ. I wish I had the high idle switch option. anyway to add this?
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post #6 of 34 (permalink) Old 09-12-2017, 05:08 PM
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High Idle Switch

Try this https://www.gmupfitter.com/files/med...lletin_82b.pdf


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post #7 of 34 (permalink) Old 09-13-2017, 06:18 AM
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That just explains how to order it on a truck (new) and how to use it. We are trying to figure out if it can be added to a truck post production.
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post #8 of 34 (permalink) Old 09-13-2017, 06:50 AM
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I am going to touch base with some of the guys here at the shop.

We offer a high idle kit for the earlier trucks but nothing for the L5P. Next time we get one here in the shop I will make sure the guys have it on their product development sheet and see if it is a simple as the earlier trucks. Wont be a quick response but it is on our radar. Thank You.

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post #9 of 34 (permalink) Old 09-13-2017, 06:58 AM
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Quote:
Originally Posted by nickMA View Post
I am going to touch base with some of the guys here at the shop.

We offer a high idle kit for the earlier trucks but nothing for the L5P. Next time we get one here in the shop I will make sure the guys have it on their product development sheet and see if it is a simple as the earlier trucks. Wont be a quick response but it is on our radar. Thank You.
Good to know thank you!
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post #10 of 34 (permalink) Old 09-13-2017, 07:10 AM
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Quote:
Originally Posted by StrmTrpr View Post
That just explains how to order it on a truck (new) and how to use it. We are trying to figure out if it can be added to a truck post production.
Read page 3 of the posted PDF, it can be programmed by a cooperative dealer. There is no hardware added with the current model, it is just a programming change to enable a feature that actually exists on any of the trucks with cruise control. UF3 (fast idle) is nothing but a programming change on these trucks and the dealer will either make their profit on the initial sale or on the service fee (if the feature is "unlocked" at a later date); depending upon your dealer it MAY be cheaper to skip it on order and have it programmed later but for those thinking about ordering keep in mind you aren't paying retail sticker for the pickup and thus you aren't paying for the full retail for the UF3 option ($200).
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