Is there anyway to turn on high idle when the truck is running? I know when i use my remote start it will idle higher, but i cant seem to figure out how to do it while running.
High Idle
- Thread starter Bosshogg
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DarkGhostPhantom
Member
You'll have to make sure you have the setting turned on in the head unit. Under comfort and convenience I belive.
Then when truck is running you'll have to apply parking break (push the small button on left side of dash) and then hit the cruise control knob down.
Under Climate and Air Quality, you can turn off and on... Rapid Heat-Elevated Idle. If truck is already warmed up, it won't elevate. Also it seems like it has to be below freezing to work.
There is a High Idle Switch, if optioned, that Mr. PHANTOM referred to. There is no infotainment system setting to use it. There will be a $200 line item on the monroney label if it is equipped.
Last edited:
DarkGhostPhantom
Member
Here is a video showing you have to make sure you enable it via the infotainment system if you ordered it with it.
I know there is a setting as I have it on mine.
I know there is a setting as I have it on mine.
He is confused as most salespeople. You would think it would be a requirement to read the owners manual to be in sales. And understand what they read. And for God's sake, don't make a youtube video to prove you don't.
From the GMC 2024 HD diesel supplement manual, page 9...
There are 2 systems here, that people get confused about. There is an Elevated idle that has to be enabled in the infotainment screen.
Then there is a High idle switch that costs an extra $200 dollars. Why gm can't name it Fast idle on the window sticker or call it High idle in the manual.
Either way the fast/high idle does NOT/can NOT be enabled in the infotainment system.
The Elevated idle can not be initiated by the cruise set roller. It is controled by the ECM. No user control, 'cept for turning it on or off in the infotainment system. Won't work above 32° or engine temp above 165°.
The High/fast idle can only be manually turned on with the cruise set roller whenever the user wants. I use it when parked to get more air moving across the condenser when the air temp is above 90°. It can not be initiated by a remote start.
From the GMC 2024 HD diesel supplement manual, page 9...
There are 2 systems here, that people get confused about. There is an Elevated idle that has to be enabled in the infotainment screen.
Then there is a High idle switch that costs an extra $200 dollars. Why gm can't name it Fast idle on the window sticker or call it High idle in the manual.
Either way the fast/high idle does NOT/can NOT be enabled in the infotainment system.
The Elevated idle can not be initiated by the cruise set roller. It is controled by the ECM. No user control, 'cept for turning it on or off in the infotainment system. Won't work above 32° or engine temp above 165°.
The High/fast idle can only be manually turned on with the cruise set roller whenever the user wants. I use it when parked to get more air moving across the condenser when the air temp is above 90°. It can not be initiated by a remote start.
DarkGhostPhantom
Member
I agree they need to explain them better and call them what they are not interchange the words like they have been.
--> They should put something like you wrote in a little handout so people will stop getting confused and calling it different things.
So in this case I would have elevated Idle and Fast Idle on my build since I added the "high idle switch".
--> They should put something like you wrote in a little handout so people will stop getting confused and calling it different things.
So in this case I would have elevated Idle and Fast Idle on my build since I added the "high idle switch".
VolklRunner
New member
Thank you for explaining this. GM made this WAY too confusing. I read the Duramax supplemental cover to cover, they could have explained this better. I have a couple questions:
1) Everything I'm finding online suggest not idling these Duramax motors. Period. What are you to do archery hunting in 100 degree NV summers between hikes looking for AC, or the opposite, hunting/skiing in 20 degree weather wanting to sit and heat up for a spell? Am I really supposed to idle for 15 minute max periods with big breaks between?
2) Would then a high-idle set solve this be it 100 degrees or 20? Run high idle only? And for how long?
3) Many Many days during winter here, it's 28 or so degrees in the morning. Frost locked up windshields. Am I not advised to remote start vehicle and let it run 10 minutes or so to defrost?
This seems like a huge bummer.
1. Keep an eye on the dpf soot level if'n you're idling for long periods. I have not had issues idling for hours at a time. Just keep in mind the truck will not regen at an idle.
2. I run for less than an hour at times on high idle it seems.
3. gm lets you do 2 remote starts without issues. The pre-re's have a 15 minute timer for remote starts.
Bonus. Due to environmental/safety concerns, gm has around a 30 minute idle timer built in and will shut engine down.
A gm dealership service dept can reprogram the truck to eliminate this idling timer. They have no issues to do this for .gov/police/ems/tow truck vehicles. I went to my service dept with the printed out tsb. Told them I need this done to my trucks, as I farm and need a truck to run at all times, also. They didn't bat an eye and reprogrammed the bcm.
2. I run for less than an hour at times on high idle it seems.
3. gm lets you do 2 remote starts without issues. The pre-re's have a 15 minute timer for remote starts.
Bonus. Due to environmental/safety concerns, gm has around a 30 minute idle timer built in and will shut engine down.
A gm dealership service dept can reprogram the truck to eliminate this idling timer. They have no issues to do this for .gov/police/ems/tow truck vehicles. I went to my service dept with the printed out tsb. Told them I need this done to my trucks, as I farm and need a truck to run at all times, also. They didn't bat an eye and reprogrammed the bcm.
I would say the no idling rule only applies to idling in the 600 rpm idle - not under high idle. High idle is meant for idling for this exact purpose - idling for extended periods of time - it keeps your oil pressure up and flowing as opposed to settling down and causing wear and tear.
As far as cold starts, never drive a cold diesel. I wouldn't even remote start it. Start it regularly, let it run for some seconds and within 30 seconds switch to high idle for 10-15 minutes. As a matter of fact, when I started to use high idle for warm ups, my Regen mileage / time in between went up significantly.
You can probably run high idle indefinitely but you need to be monitoring for regens.
If you need a truck to idle for long periods of time you're probably better off with the gas variant.
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I am not in the habit or do I live in an environment where I feel the need to idle for longer periods of time. It is rare but I can tell you my gas HD has shut off while idling after about 20 minutes.
Its been a long time since I checked high idle settings but vaguely remember setting it to going into high idle under certain conditions. Someone please refresh my memory.
I am assuming you are talking about the "elevated" idle that is available to be turned off or on under settings, on the infotainment screen. ECM controls it. It's free.
"High" or "Fast" idle (gm uses both words for the same function) is controlled by operator and costs $200.
You know I have every option in my truck; its all in my signature!
Sorry, I don't see signitures on mobile. There are no conditions that need to be met to use "high" or "fast" idle.
Well, just setting the Park brake and be in Park or Neutral.
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