DTC codes / P2Axx · Hybrid propulsion / P2A51
P2A51 indicates that the powertrain control module has detected an out-of-range or erratic signal from the outlet temperature sensor of the alternative fuel vaporizer, which is part of a gaseous fuel system such as compressed natural gas or liquefied petroleum gas. The computer compares the sensor's voltage or resistance against expected values for the current operating conditions and flags the circuit when the reading falls outside the calibrated window or fails a rationality check.
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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