Cylinder Deactivation Transition Vibration Excessive

What this code means

The vibration during the transition between full-cylinder and reduced-cylinder operation exceeds the acceptable threshold.

Symptoms

• Noticeable shudder during deactivation transition
• Vibration at highway cruise
• Engine sounds rough during cylinder change
• Passengers feel vibration change
• Steering wheel vibration at cruise

Common causes

• Engine mount worn or collapsed
• Active engine mount failure
• Deactivation transition timing incorrect
• Pendulum absorber in flywheel damaged
• Cylinder balance issue during transition

Diagnostic steps

1. Monitor vibration levels during cylinder transition
2. Inspect engine mounts condition
3. Test active engine mount operation
4. Check deactivation solenoid timing
5. Compare vibration with deactivation enabled vs disabled

Repair notes

Replace worn engine mounts. Active engine mount systems may need replacement. Recalibrate deactivation transition timing.

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