P3626moderate severityPowertrain
Cylinder Deactivation Transition Vibration Excessive
on 2009 Audi R8 5.2L V10 (Gen 1, 525hp) · AWD
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
- Monitor vibration levels during cylinder transition
- Inspect engine mounts condition
- Test active engine mount operation
- Check deactivation solenoid timing
- 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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