P3400
Système
Powertrain (Engine)
Scanner requis
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Cylinder 0 Deactivation System Performance

Understand P3400, common causes, and the right FOXWELL scanner to diagnose it.

Active Fuel Management (AFM/DOD) system cannot deactivate or reactivate cylinder 0 as commanded — common on GM V6/V8 with cylinder deactivation.

Symptômes courants

  • Ticking or misfire on affected cylinder
  • P0300 may accompany
  • Rough idle
  • Check engine light
  • Reduced fuel economy benefit lost

Causes typiques

  • Failed AFM lifter on cylinder 0
  • Low oil pressure to AFM solenoids
  • Wrong oil viscosity or low oil level
  • AFM solenoid oil passage blockage
  • Collapsed AFM lifter on cylinder 0

Quel scanner choisir ?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Utilisez les données en direct et le freeze frame avant de remplacer des pièces. Les codes ABS, SRS et U nécessitent souvent un scanner mult systèmes.

Conseils de diagnostic

  • Enregistrez le freeze frame lors de la première apparition du code
  • Effacez le code uniquement après avoir corrigé la cause
  • Vérifiez les codes en attente associés
  • Vérifiez que la batterie est au-dessus de 12,4 V avant de suspecter un capteur

Scanners FOXWELL recommandés

Questions fréquentes

Can I diagnose P3400 with a basic code reader?
P3400 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P3400?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.