P349D

Cylinder 6 Deactivation/Intake Valve Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine operation
Increased fuel consumption
Reduced engine power
Check Engine Light Illuminates
Vibrations at idle

Causes

Malfunction of the cylinder deactivation solenoid valve
Valvetrain hydraulic problems
Low oil pressure
Mechanical damage to valves
Wiring or ECU problems

How to Fix

Check the level and condition of the engine oil
Diagnose the operation of deactivation solenoid valves
Check the oil pressure in the system
Inspect the valve mechanism for damage
Check the integrity of the electrical control circuits

Related codes

P349C P349E P349F