P3400Faulty Cylinder Deactivation System
⚙️ Powertrain (Motor y Transmisión)🏭 Specific to Audi
The engine control module has detected a fault in the cylinder deactivation system on bank 1. Variable displacement engines shut off cylinders under low load to save fuel — a fault here disables the function.
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Can I keep driving? With caution
You can drive to the shop, but do not postpone the repair. The problem may worsen and damage other components.
Sistema Afectado
Motor · Powertrain
La falla pertenece al grupo motopropulsor (motor y gestión electrónica).
Espacio para vendedores de repuestos
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Possible Causes
The components or conditions that trigger this code
- 1Deactivation solenoid or oil control valve failed
- 2Collapsing lifter stuck
- 3Low oil pressure prevents activation
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Estimated Cost
Approximate range in USD (varies by region and shop)
$100—$800
Varies by diagnosis
* Diagnosis only: $50–$150
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Quick Info
CodeP3400
CategoryMotor (P)
ManufacturerAudi
SeverityModerada
Symptoms0
Causes3
Solution steps0
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