OBD-II DTC · SAE J2012

P0403

Exhaust Gas Recirculation Circuit Malfunction

EGR → Suppressible (off-road only)

What P0403 means

P0403 is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Exhaust Gas Recirculation Circuit Malfunction. This is the OEM-agnostic definition; specific manufacturer interpretation may add detail (subsystem, bank, sensor location) but the core meaning is consistent across all OBD-II compliant vehicles since 1996.

Can this code be suppressed via ECU tuning?

Very common service. EGR mechanical failure (sticking, carbon buildup) often pairs with ECU-side EGR off. Off-road or motorsport only.

Related codes in the P04xx family

P0400P0401P0402P0404P0405P0406P0407P0408P0409P0410P0411P0412

Need P0403 resolved on a real ECU?

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