P3400

Cylinder Deactivation System Bank 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–167 (est.)

Symptoms

Increased fuel consumption
Rough engine idling
Reduced engine power
Check Engine Light Illuminates
Cylinder deactivation system does not work

Causes

Malfunction of cylinder deactivation solenoid valves
Problems with the system wiring harness
Malfunction of camshaft position sensors
Mechanical damage to system components
Problems with ECU software

How to Fix

Check the condition of the system solenoid valves
Diagnose the integrity of the wiring harness
Check the operation of the camshaft position sensors
Inspect the mechanical components of the system for damage
Update ECU software if necessary

Related codes

P3401 P3402 P3403