OBD-II DTC · SAE J2012

P3400

Cylinder Deactivation Sys Bank1

Misfire → Do NOT suppress

What P3400 means

P3400 is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Cylinder Deactivation Sys 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?

Should NEVER be suppressed. Misfires indicate genuine combustion issues (ignition, injector, mechanical). Suppressing them risks engine damage.

Related codes in the P34xx family

P3401P3402P3403P3404P3405P3406P3407P3408P3409P3410P3411P3412

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