L5P E41 ECM unlock
The E41 engine computer on 2017+ L5P Duramax trucks is locked and has to be unlocked before tuning software can write to it. Ship us the ECM and we send it back unlocked.
Trucks
- 2017+ Chevrolet Silverado 2500HD and 3500HD with the 6.6L L5P Duramax
- 2017+ GMC Sierra 2500HD and 3500HD with the 6.6L L5P Duramax
- Chassis-cab and medium-duty L5P trucks: email us the part number
Emissions-legal tuning only
We unlock the E41 for tuning that keeps every emissions system in place and working: power, towing and transmission tunes that leave the DPF, DEF/SCR and EGR intact. We don't do deletes, and we won't unlock a module for one.
Works with the software your tuner uses
Tell us what your tuner works with when you start your order: HP Tuners VCM Suite or another platform. Each one unlocks controllers its own way. Some we unlock on our bench. Others go through the software maker's official unlock or upgrade program, and we handle that for you. Your quote says which, and lists any vendor fee.
How it works
- Order online with your VIN and tuning software
- We confirm the price and process before you ship
- We save the full original read, unlock and verify it
- It ships back tracked, ready for your tuner
HP Tuners, VCM Suite and MPVI are trademarks of their owners. Modulinx is an independent service and is not affiliated with or endorsed by them.
E41 unlocks are quoted per truck. Depending on your software and model year, the unlock may go through the software maker's own upgrade program, which carries a vendor fee of several hundred dollars. Your quote lists every fee before you ship.
- Price confirmed before you ship
- Original data saved before any work
- Tracked return shipping
- 90-day workmanship warranty
Common questions
Do you do delete tunes?
No. We don't do emissions-defeat programming, and we don't unlock modules for that purpose.
Do I still need HP Tuners credits?
Yes. An unlock lets the tuning software write to the module. It doesn't license the vehicle. Your tuner still buys credits or a license in their software as usual.
Do you also unlock the TCM?
Often, yes. Email us the part number from the TCM label and we'll confirm what your transmission needs. GM T87A units are covered on our T87A TCM unlock page.
Are you part of HP Tuners?
No. We're an independent ASE-certified shop. We unlock and program modules so they work with the tuning software you already use.
Related
Ready to ship it?
Start an order online. We confirm your price and send your job number within one business day.
Dealer-level programming. Without the dealer.
Box it. Ship it. Done. We email you when it lands on our bench and again when it ships back tested.