No relearns or reprogramming is required as long as the ECM returns to the same vehicle it came from.E90/E93 ECM License for tuning: (8) Universal Credits (sold separately). This option takes at least 3 business days to complete (not including shipping times). After upgrading, you’ll have full access to calibrate, log, and scan via the OBDII port. We will upgrade your original ECM so it’s ready to accept tunes, and then we’ll send it back. Upgrade your original E90 or E93 ECM by sending it to HP Tuners. Users must follow these installation instructions to properly install the new ECM.E90/E93 ECM License for tuning: (8) Universal Credits (sold separately).This option is ideal if you need your vehicle up and running as quickly as possible. Make sure to include your VIN at checkout. Purchase a brand new E90 or E93 ECM that is already upgraded for tuning. But I did want to let you know that when I was Google searching to figure out if anybody else had this issue with this vehicle or this ECU or whatever that this is what I did to get it to fully right without having a bench flash it.E90 ECM: 2019-2022 Chevrolet Silverado & GMC Sierra, 5.3L & 6.2L V8 (L84/L87) (non-Global B)Į93 ECM: 2020-2023 Chevrolet Silverado & GMC Sierra, 6.6L (L8T) / 2021.5 Silverado/Sierra 1500 5.3L Nevertheless I got it to successfully right and everything seems to be fine and I'm about to start it here in a second. Anyway that's how I got it to completely rewrite for the first time using my mpvi to and whatever version of HP tuners I have it's only like a couple versions old maybe from a couple months I just have not updated. And she also has a viper security alarm on it which was not disabled but I did pull the fuse on the stereo just to be sure. There is an aftermarket Kenwood in the vehicle that is supposed to interface with the car but it looks like it just does it through the steering wheel wiring it doesn't interface with any sort of like car Network. After that I flicked the vehicle back into run and then try to write entire at high speed and at first it didn't work and without closing anything or turning anything off I tried it again and it worked just fine and it looks like now it's about to complete the whole rewrite. So yet again I went back to low speed calibration only let that finish to 100% which it did fine then against my better judgment I keyed off and then try to start of course it wouldn't start. So I tried to write it on low speed and then I tried after that finish to write entire on high speed and low speed and it timed out. That high-speed timed out when I tried to write the calibration only. So high speed timed out on write entire and low speed timed out on write entire. So I just did a right calibration and mind you this is the first time that I've ever written to this ECU. My main concern was getting a full right one way or another just to get it to you know finish. So I switched it over to write calibration and of course I haven't switched off the power or anything at all. So I could not write and tire using high speed or low speed it would time out at about 2%. Okay so I just ran into this issue with a 2004 Silverado 4.3 with a p59 in it. (Running the latest VCM v4.8.7 as of this post). After that, my truck then fired up and everything worked like it should! Just something to maybe try if you're getting timeout issues during writing? I will also note, I ran into this issue with the new MPVI2 Pro, I did not have this issue with my MPVI1 Pro, so it's got something to do with the newer HPTuners box that didn't happen on the original one. Only took round 2 minutes total to write, so not terrible (way better than "another brand" programmer I used to use in the early days). When I tried it again after that, it wrote just fine and completed successfully. What I ended up doing to get it to work was just unchecked the "Use High Speed" check box. I do also have an aftermarket radio with a CAN adapter module for remote on signal and has the door ajar beeper (since the original was in the stock radio). Every time I pressed Write, it would initialize and erase the ECU, then when it got to the actual writing step, sometimes it would get to 20%, sometimes only 5%, and sometimes it would just stay at 0%, the a few seconds later my gauges would fade out, and it would timeout. I also had the same issue in my 2005 Silverado (P59 ECM).
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