P04DB

Crankcase Ventilation System Disconnected

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$22–89 (est.)

Symptoms

Check Engine Light Is On
Unstable idle
Reduced engine power
Increased oil consumption
Noises from the valve cover area

Causes

PCV hose is disconnected or damaged
Crankcase ventilation valve malfunction
Dirty or clogged PCV system
Mechanical damage to system components
Valve cover sealing problems

How to Fix

Visual inspection of PCV hoses and connections
Checking the condition of the crankcase ventilation valve
System leak testing
Replacing damaged hoses or valves
Cleaning the system when blockages are detected
Reset error and test drive

Related codes

P0171 P0174 P2279 P2281