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• 19:03, 6 July 2026 Cliff talk contribs created page Code 51 (Created page with "'''Code 51''' is a diagnostic trouble code related to the ECM PROM on the Pontiac Fiero. Code 51 indicates that the ECM has detected a problem with the PROM, PROM installation, PROM connection, or related ECM memory function. == Overview == The PROM contains calibration information used by the ECM. This calibration tells the ECM how to control fuel, ignition, idle, emissions equipment, and other engine-management functions for a sp...")