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2017 - 2021 L5P 2500 3500 Duramax | Tune file only

$1,000.00 - $1,400.00

2017 - 2021 L5P 2500 3500 Duramax | Tune file only

$1,000.00 - $1,400.00

2017 - 2021 L5P 2500 3500 Duramax | Tune file only

$1,000.00 - $1,400.00

This is available to anyone, it does not matter who you were previously tuned by.


How to get ECM/TCM serial number:

  • It is located on the back of the ecm on a white sticker, you can take a picture of it or;
  • If you hook up your computer to the truck (make sure you have the most recent hptuners beta as it updated today), then turn key on (dont start), then in the editor click the read button (or go to the drop down at the top of the page that says flash), save the file and send it to me.

DSP5 tunes are based off steering wheel controls. This is true swithable tuning where each tune setting has it's own sets of maps.

  • To change positions, simply hold down the cruise cancel button for a few seconds and push up (resume/increase speed) on the cruise to go up in tune levels, down to go down. The glow plug indicator light will blink the amount of times for the tune level you are in.

We will only offer tuning on the following injectors:

⭕ OEM / Stock injectors
⭕ Exergy
⭕ S&S Diesel

we will not offer tuning on random 90hp, stage 321423521 injectors, based on inconsistent flow.


Switch on the Fly Power levels

  1. 30
  2. 80
  3. 150
  4. 180
  5. 220

** IMMO relearn is required via GM TIS2 with a GM MDI or Mongoose cable in order for the VATS system to work. 2 seperate files will be sent to be used for the IMMO being reprogrammed, and one without it having to be reprogrammed.

Transmission tuning is NOT available for the 2020 yet.

Returns Policy

Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. 15% restocking fee is applied for all returns, unless it is deemed our fault. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.

Additional non-returnable items: Gift cards Downloadable software products Some health and personal care items To complete your return, we require a receipt or proof of purchase.

Refunds (if applicable) Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund. If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds (if applicable) If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us at

Sale items (if applicable) Only regular priced items may be refunded, unfortunately sale items cannot be refunded.

Exchanges (if applicable) We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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