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  • High Idle Kit - LB7 | 2001-2004

High Idle Kit - LB7 | 2001-2004

16 Reviews
SKU: 10457

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Full manual control of the elevated idle on your Duramax truck is possible with our High Idle Kit.

Operation is simple using only your cruise switch, no extra switches to mount or hide in your truck and features fool proof operation.

Get faster warm ups, increased output from your charging system and reduced wear on your engine during situations that require idling for extended periods of time.

Click Here to Download Instructions

Kit Includes

  • Wire with ECM pin
  • Wire loom
  • Scotch lock
  • Grommet
  • Zip ties
  • Instructions


Will this affect the factory cruise control function?

All of the functions will work as they did before while driving. In this case, the cruise buttons are only used to control the function of the high idle while in Park or Neutral.

I just installed this and it is not working, what now?

The most common issue is the connection of the high idle wire to the brake switch. It may help to strip the insulation on the high idle wire and a portion of the insulation on the green/white wire at the brake switch. Then the wire can be twisted together and taped up or even better, a drop of solder then covered with tape.

If you are sure you have a good clean connection, then we need to check the green/white wire for power. We should see 12 volts when in Park or Neutral and the brake pedal is released. 

If you do not have power on that circuit, check the 10amp BTSI fuse in the under-hood fuse block. 

If you find the fuse to be in good shape, use a test light or meter to ensure you have power at both sides of the fuse. 

If you have no power to the fuse, then check the reverse lights. With the key on and engine off, put the gear selector in reverse and see if the lights are on. If not, lets take a close look at the 20amp B/U LP fuse in the under-hood fuse block and replace if needed.

Will this work if I have a ZF6 manual transmission?

Yes. The install will be exactly the same for the ECM pin installation. We are using the Shift Interlock feature to supply power to activate the high idle. The shift interlock is the safety feature that requires you to step on the brake to remove the gear shift from Park. The manual transmission does not have this feature of course. It is recommended to install a switch from an ignition hot circuit to the end of the wire that would normally attach to the brake switch. The switch must be turned on to activate the high idle with the cruise buttons. It is very important that the switch is shut off while driving or the RPM will be limited. You could also use the switch as a valet mode if you wish. The limited RPM will not hurt anything, but will very frustrating to drive the truck.


GM 2500HD and 3500 Duramax Silverado - Sierra 6.6L V8 Diesel Trucks




2001, 2002, 2003, Early 2004

Ratings & Reviews

16 Reviews

  • 3 stars
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  • 2 stars
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  • 1 star
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Easy and works good

Jake - | 10/25/2019 12:01:00 pm

Running the pin into the ecm was kinda hard with barley any room but other than that it works grear


Michael - | 09/15/2019 12:01:00 pm

I had it installed, there was no hang-ups on that. Operation is flawless. I am very happy. Thank you MA

Great inexpensive addition

Gabriel Molina - | 02/08/2019 12:01:00 pm

Wish I would’ve gotten this product sooner. Helps a lot with engine warm-up time and works perfectly. Install was a breeze thanks to the detailed instructions and video.

High idle kit

Trevor - | 05/17/2019 12:01:00 pm

Pro: very easy to install, and the instructions were very easy to understand. Couldn't have asked for better instructions Cons: the idle elevation level cannot be controlled. But that does not affect the kit. It still works exactly how it's supposed to.

Great investment

Jordon - | 01/15/2019 12:01:00 pm

Kit comes with everything needed to install as well as a great install guide. Truck warms up a lot quicker and also keeps oil pressure up. Definitely recommend this product.

Great kit

Trevor - | 12/14/2018 12:01:00 pm

This kit was super easy to install with easily understandable instructions and everything I needed for a successful high idle kit install. Thank you Merchant Auto

Lb7 high idle

John - | 11/25/2018 12:01:00 pm

Awesome! Works great

Works great

Charles - | 10/29/2018 12:01:00 pm

Instructions were mostly clear for a guy that isnt an experienced mechanic. Product works great!

Great product

Kolby - | 10/04/2018 12:01:00 pm

Shipping was good. Simple install, just follow along with the YouTube video and you're golden! Works great on my 2003 duramax. Simple and effective. Great product

Definitely worth the price of admission!!

Aaron - | 05/02/2018 12:01:00 pm

Super simple, inexpensive, works great..... what's not to like?! And on my '01, I get all 3 levels of high idle!!

High idle kit

Mike - | 02/01/2018 12:01:00 pm

Came on time and did exactly as advertised. Instructions are spot on. Less than an hour of work and a 12 minute head start, you'll have a warm truck. Couldnt be happier with nu purchase

High idle kit

William - | 12/23/2017 12:01:00 pm

This kit was right on! It's a little funny to pay 20 for a wife and some zip ties but it is well worth it! The instructions are worth the 20 alone and the fact that I don't have an additional switch or extra holes in my dash is awesome. The hardest part was getting the grey retainer off of my ECM and back on- apparently it only goes on one way. Well done Merchant Auto!

Nice Kit/ Worth The Money

Kyle - | 11/22/2017 12:01:00 pm

Install was not great but not bad. Took a little more time in my case because the ECM had been worked on before I had it. I didn't have the room to just pull the connector out in the open like in the video in my case. Just make sure you have a good connection with the blue connector! Over all in my case it was still well worth it in the end. I would buy it again!

High idle kit

Neil - | 10/28/2017 12:01:00 pm

Great product, great install video

High idel kit

Mark - | 09/28/2017 12:01:00 pm

Nice, simple, as advertised. So why didn't GM do it to begin with? Right?

Almost perfect but awesome for the price

Lucas| 11/06/2020 5:38 pm

Installed this myself as I am a diesel mechanic apprentice, everything went smoothly and well except for hooking it up to the brake pedal. Had trouble getting a good connection and ended up breaking the little plastic blue piece (user error) but was able to just cut insulation off both and wrap the given wire around it followed by wrapping it in electrical tape. It works perfectly now! I found that the pinch method with the blue piece did not cut through enough of the insulation when I undid it.