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DTC codes / P2Axx · Hybrid propulsion / P2A4F

P2A4FAlternative Fuel Temperature Sensor Circuit Intermittent/Erratic

P2A4F means the powertrain control module (PCM) has detected an intermittent or erratic signal from the alternative fuel temperature sensor circuit, which monitors the temperature of fuels such as compressed natural gas, liquefied petroleum gas, or ethanol blends. The PCM sets this code when the sensor voltage jumps unpredictably or drops out momentarily, rather than reading a steady value.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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