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DTC codes / P22xx · Fuel and air metering (injector circuits) / P224D
P224D indicates that the powertrain control module (PCM) has detected a performance fault in the control circuit for the alternative fuel tank shutoff valve A, typically a valve that isolates the alternative fuel tank from the engine. The PCM commands the valve to open or close and monitors the circuit for expected voltage or current changes; when the response does not match the command, or the circuit appears stuck off, the code is stored.
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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