PREUX POWER started because the tools we needed did not exist. Locked modules, undocumented calibrations, operating systems nobody had mapped — the answer from most of the industry was "send it away" or "that can't be done."
So we built the tooling ourselves: ECU flashers, checksum and signature utilities, definition generators, and custom operating systems. That started on GM P01 / P59 — Custom OS is where this bench began — then carried into E38 / E67 and E90 / E99. That work is why we can change things a file service cannot reach. When a calibration needs a table the factory OS never exposed, we add it.
We got started before a lot of the names that now fill this space. We were part of the seed. The seed just sprouted differently on this bench. In many cases it never germinated with the whole picture — we finished it: fixing what others said could not be fixed, and taking cars further for customers who had already paid somewhere else and been turned away.
Most work is remote: you read the ECU, send the file over the internet, and we send a calibrated file back — you do not have to ship the controller. Every file is written against the read you sent us. Not a database match, not a stage file with your VIN pasted in. It gets checksum-corrected, byte-verified against the target image, and it does not leave the bench until it is complete. After that we fine-tune, dyno-tune, and street-tune from your logs and feedback — the car tells us what to change next.
Every address is resolved against the target operating system's own image. Nothing is blind-copied from a sibling part number — that is how ECUs get bricked, and we don't do it.
If your platform can't do what you're asking, we'll tell you before you pay rather than after. An honest no costs less than a bad file.
The file stays here until it is complete. Then we fine-tune, dyno-tune, and street-tune from your logs and feedback. Free revisions for the first year; re-tunes in year one are 50% if nothing major changed.
Whether it's a single car or a shop full of them, the process is the same.
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