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DTC codes / P2Axx · Hybrid propulsion / P2A59
P2A59 indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal from the outlet temperature sensor of the alternative fuel vaporizer, designated as 'B'. This sensor monitors the temperature of the fuel vapor exiting the vaporizer to ensure proper fuel delivery and combustion characteristics; the PCM sets this code when the signal voltage fluctuates unpredictably or drops out momentarily, rather than reading a steady value.
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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