Code 15: Revision history

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6 July 2026

  • curprev 18:5618:56, 6 July 2026 Cliff talk contribs 2,822 bytes +2,822 Created page with "'''Code 15''' is a diagnostic trouble code related to the coolant temperature sensor circuit on the Pontiac Fiero. Code 15 indicates that the ECM is seeing a coolant temperature sensor signal that represents an unusually low coolant temperature. == Overview == The coolant temperature sensor is a thermistor. Its resistance changes with temperature. As coolant temperature rises, sensor resistance decreases. Code 15 is set when the E..."