GM E41 ECM Services (L5P)


Get your 2017+ Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax ready for tuning! Choose one of two options to upgrade your L5P E41 ECM for tuning: Purchase or Upgrade.

Shipping address for send-in E41 ECM service: HP Tuners (ATT: L5P ECM Service), 700 Eastwood Ln, Buffalo Grove, IL 60089

ECMs with broken “LOCKING” tabs or connectors WILL NOT be accepted for upgrades.

See instructional videos!
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Tune your GM L5P Truck with HP Tuners

The L5P ECM Service from HP Tuners gives you the power to tune your 2017+ Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax.

There are two available options to calibrate, log, and scan via your vehicle’s OBDII port—Upgrade or Purchase. With either choice, you receive an E41 ECM that is fully compatible and ready to tune with the MPVI2 or newer device and VCM Suite (BETA).

Upgrade Service

This one-time, send-in upgrade option will upgrade your original or spare E41 ECM to enable tuning in VCM Suite. Simply send us your ECM and we’ll send it back to you fully upgraded for tuning in the latest VCM Suite (BETA). This means you must remove your ECM from your vehicle and ship it to HP Tuners (see removal video).

Advantages of the L5P ECM Upgrade Service:

  • No IMMO relearn*
  • No crank relearn*
  • No “Replace ECM” function*
*As long as the ECM is installed back into the same vehicle it came from. If you send in a spare ECM, you must complete all reprograming and relearns in the installation instructions. 

Please allow 1-3 business days for service (not including shipping time).

Important Note: This is a send-in service that requires you to send HP Tuners your ECM for servicing.

New ECM Purchase

Short on time and need an upgraded E41 ECM ASAP? This option allows you to purchase a brand-new, fully upgraded E41 ECM instead of sending in your original controller for servicing. This is ideal for enthusiasts who want their vehicles up and running as quickly as possible.

Once you install the brand-new, already upgraded E41 ECM, you must follow these installation steps.

Everything you need to tune your GM E41 ECM (L5P) vehicle with HP Tuners:

  • Select one of the two options available above: Upgrade or Purchase.
  • Download the latest version of VCM Suite BETA for free here.
  • Once upgraded, purchase (8) Universal Credits to license your upgraded ECM.
  • Make sure you have an MPVI2, MPVI2+, or MPVI3 interface.
    • Purchase a new MPVI3 here.
    • Upgrade your old device for MPVI3 here.

Note: Universal Credits for licensing are not included in the cost of any upgrade service or purchase. Credits must be purchased separately.

Instructional Videos

For more in-depth information into our L5P support, L5P Exchange, or How To Remove Your GM L5P E41 ECM, please reference the videos below.

  • ECMs with broken tabs will NOT be accepted for Upgrades.
  • Your Purchased or Upgraded E41 ECM can only be tuned via the OBDII port with an MPVI2/2+/3 (updated with the latest firmware), the latest version of VCM Suite BETA, and an internet connection.
  • No other tuning or calibration tools can be used with the ECM (including dealer reflash tools).
  • The latest version of VCM Suite can be used to return to stock calibration and/or update to the latest stock calibration.
  • If you select the PURCHASE option, you must follow these installation steps once receiving your new ECM.
  • VCM Scanner, Dealer Diagnostic, and other diagnostic tools will continue to function normally.
  • VCM Suite (version 4.13+) can be used to return to the stock calibration and/or update to the latest stock calibration.
  • If purchasing a new ECM, the Vehicle Anti-Theft System relearn (by a dealer tool) is required once the new ECM is installed.
  • The GM E41 ECM Upgrade Service take 1-3 business days to complete (not including shipping times) per ECM.

These steps only apply to the send-in upgrade service, NOT the purchase.

Step 1: Once you’ve confirmed your vehicle’s support (2017+ Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax with E41 ECM), purchase this service.

Step 2: After placing your order, see the “Shipping” tab for a shipping form and address. Fill out this form and place it in your shipping box. You will also receive an email immediately after placing your order with this shipping form and address.

Step 3: Remove your E41 ECM from your vehicle and safely package it. Place your completed shipping form in the box.

Step 4: Write your order number on the outside of the shipping box.

Step 5: Ship your ECM to HP Tuners using any carrier you prefer. The shipping address can be found on this page and in the email discussed in step 2. Shipping costs are the responsibility of the customer.

Step 6: HP Tuners will upgrade your ECM for tuning and diagnostics. Then, we’ll ship it back to you.

Step 7: Once you receive your upgraded ECM, install it back into your vehicle. License the E41 ECM for (8) Universal Credits (sold separately) and start tuning with your MPVI2 or newer generation device and the latest version of VCM Suite BETA.

Shipping address for send-in service:

HP Tuners, LLC
ATT: L5P ECM Service
700 Eastwood Ln
Buffalo Grove, IL 60089

After purchasing this service, please fill out the shipping form below and place it inside your shipping box.


Please allow 1-3 business days (not including shipping times) per ECM that you send in for the upgrade process to be completed.

Any additional hardware ordered with this product will be shipped along with your ECM. To avoid any delays on other products, please create a separate order for those items.

⚠️ NOTE: Customers are responsible for shipping costs when sending HP Tuners your ECM/PCM/TCM. The shipping charge at checkout only covers returning your control module after modification.

  • These ECM/PCM/TCM services are completed at the owner’s risk. HP Tuners will not be responsible for the vehicle, its powertrain, or electronics, nor how the control module is used, calibrated, and its functionality.
  • Due to the factory location of the PCMs in the vehicle, all PCMs will exhibit signs of weathering and wear, which is completely normal.

Should you experience any issues with your PCM, please submit a ticket to our support team for assistance on how to proceed.

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