![]() Rather than using brute force computing power to crack the encryption, they developed a circuit board level hardware modification to bypass whatever security module was inside the E41 computer. It had earned a reputation of being an efficient and reliable powerplant free of the injection pump woes that plagued the earlier LML, and owners were anxious to see how much extra power could be extracted from the brand-new Duramax, and HP Tuners offered the tools needed to find out. This was in the fall of 2018, and the L5P had been on the road for about two years. Here’s an excerpt of the initial post from Duramax Forum discussing the “uncrackable” ECM found on the L5P Duramax’s: A Workaround Is Better Than NothingĪbout a year after the original post was made claiming the L5P was impossible to tune, HP Tuners announced they had developed a solution for tuning the L5P. So, the aftermarket rolled up their sleeves and accepted the challenge, then got to work. While that was a major bummer to the consumer who bought an L5P hoping to add a few aftermarket goodies, many owners knew it would be worth the wait, since the L5P showed potential for some great power gains, if only they could be unlocked. The security protocols GM employed were so intense, it would take years for an advanced computer to peel back the security on a single ECM, and because each truck uses a different combination or code, effectively this meant the L5P would be impossible to tune on a commercial scale. While it was sort of a “he-said, she said” scenario, apparently General Motors used something called a Diffie-Hellman 2048-bit key exchange in addition to an SHA-256 hash digest to prevent anyone other than a GM dealership from being able to alter the programming of the E41 ECM. ![]() The post went into further detail about the security advancements GM made on the E41 ECM, and the claims were backed up by some anecdotical evidence provided by the I.T. ![]() On September 24, 2017, a statement was issued on a Duramax discussion forum which made the bold claim that the L5P Duramax ECM would never be tuned, and the security protocols were so advanced, even the NSA would not be able to tackle the job. At the time, diesel owners had become accustomed to flash programmers and custom tuning being readily available which can add significant power gains in just minutes, so Duramax fans headed to the dealerships in droves, and as soon as they had their keys, they began asking their favorite tuning company “How much power can we add?” Unfortunately, the answer to that question was “None” and as soon as the follow-up question “Well, how long do I have to wait?” was asked, the answer disappointed everyone. When the L5P Duramax first hit the streets in the fall of 2016, enthusiasts were impressed with its initial horsepower and torque from the factory, which measured in at 445 and 910 respectively, but of course we always want more. Now, you may be thinking “what’s the big deal? Owners have been flash tuning their diesel trucks for the last two decades, right?” The simple feat of flash tuning an L5P may not sound that impressive if you’re accustomed to working on Ford and Ram trucks, but until now, the newest generation of Duramax that could be flash tuned through the OBD2 port was the LML. The Edge EVO HT2 Programmer with Locksmith Tool, part number 26402, allows you to tune the 2017-2019 Duramax ECM without removal of the ECM, a feat never before accomplished.
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