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DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2038
P2038 indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the reductant injection air pressure sensor circuit, which monitors the air pressure used to help inject diesel exhaust fluid (DEF) into the exhaust stream. The PCM compares the sensor signal against expected values under specific operating conditions and sets this code when the signal falls outside the acceptable range or does not respond as expected.
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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