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• 18:37, 6 July 2026 Cliff talk contribs created page Code 12 (Created page with "'''Code 12''' is the normal diagnostic-mode code displayed by the ECM when reading Diagnostic trouble codes on the Pontiac Fiero. Code 12 does not normally indicate a fault. It indicates that the ECM is in diagnostic mode and that the check engine light is able to flash codes. == Overview == When the ECM is placed into diagnostic mode through the ALDL connector, the check engine light should flash Code 12 before any stored trouble codes are displayed....")