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DTC codes / P01xx · Fuel and air metering / P012B
P012B indicates that the engine control module (ECM) has detected an out-of-range or performance fault in the circuit for the turbocharger or supercharger inlet pressure sensor, often called sensor A. The ECM compares the sensor's signal against expected values under specific operating conditions and sets the code when the signal does not match the predicted pressure within a calibrated time window.
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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