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DTC codes / P02xx · Fuel and air metering (injector circuits) / P0253
P0253 indicates that the powertrain control module (PCM) has detected a low voltage or low duty-cycle signal on the fuel metering control circuit for injection pump control 'A', which is often associated with the cam ring, rotor, or injector timing advance mechanism. The computer compares the commanded fuel metering position with the actual feedback signal and sets this code when the circuit remains below the expected threshold for a calibrated time.
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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