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DTC codes / P01xx · Fuel and air metering / P01AA
P01AA indicates that the powertrain control module (PCM) has detected an out-of-range voltage or implausible signal from the alternative fuel tank temperature sensor circuit. This sensor monitors the temperature of the fuel in a compressed natural gas (CNG), liquefied petroleum gas (LPG), or other alternative fuel tank, and the PCM uses that data to adjust fuel delivery and protect the tank from over-temperature conditions.
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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