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• 19:04, 6 July 2026 Cliff talk contribs created page Code 53 (Created page with "'''Code 53''' is a diagnostic trouble code related to system voltage on the Pontiac Fiero. Code 53 indicates that the ECM has detected a system over-voltage condition. == Overview == The ECM monitors vehicle electrical system voltage. If voltage becomes too high, the ECM may set Code 53. A system over-voltage condition can be caused by a charging-system problem, alternator problem, voltage regulator problem, wiring problem, poor b...")