Do credits get used every time you read or write, or only the first time you tune a car?
Only once per vehicle. HP Academy explains that credits buy a license. The license is tied to the vehicle's VIN, the controller's serial number and its operating system. After that, you can reflash that computer as many times as you like without spending more credits.
- Cost: it varies by vehicle — typically 2–6 credits; HP Tuners notes many ECM/PCM licenses take 2. Extra controllers (such as a TCM) are licensed separately.
- Reading and logging: reading the stock file comes before licensing, and datalogging with VCM Scanner is part of the normal tune-log-reflash cycle.
- Interfaces: MPVI2 and newer use universal credits that work on any supported vehicle. The original MPVI used brand-specific credits.
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Confidence: medium — sources disagree or are limited; check the sources below.
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Sources
- Universal Credits - HP Tuners — HP Tuners
- How To Use HP Tuners | Credits, Setup, Reading, Logging & Writing ECU Tunes — High Performance Academy