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DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2041
P2041 means the engine computer has seen the reductant injection air pressure sensor signal drop out or jump erratically for a moment, rather than reading a steady, plausible pressure. The circuit is not dead or shorted outright; the fault is an intermittent glitch in the sensor's electrical signal, which the computer flags because it cannot trust the air pressure reading used for diesel exhaust fluid (DEF) injection.
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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