Stage 2 Opel Astra-J OPC 2.0 Turbo ACDelco ECU Calibration File | Software 12656377 / SW G12083 | 12656378

Change log

  • v1.0 — 2025-06-09
    • Added Stage 2 and Stage 2 SB (Sport-button) maps
    • Vmax off; torque & boost ceilings raised
    • Over-run crackle enabled in SB variant
    • CVN patch and checksum correction implemented​

Release notes

  • v1.0 — 2025-06-09
    • Packaged for Astra-J OPC owners seeking switchable road/track calibrations
    • Compatible with stock internals and K04 turbo; ensure clutch health before flashing
    • Install via CMD Flash, KESS V2 or any Delco5-capable bench tool
    • Verify ECU 12656378 / software 12656377 before programming​
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