OBD-II DTC · SAE J2012

P2423

HC Adsorption Catalyst Efficiency Below Threshold Bank1

Catalyst → Suppressible (off-road only)

What P2423 means

P2423 is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: HC Adsorption Catalyst Efficiency Below Threshold Bank1. 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?

Suppressible at the calibration level. Required when fitting a de-cat downpipe or running a leaner catalyst. Off-road only.

Related codes in the P24xx family

P2400P2401P2402P2403P2404P2405P2406P2407P2408P2409P2410P2411

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