Garbage disposal vibrates and makes noise only when the dishwasher is draining.

Safety First: Turn OFF power to both the disposal and dishwasher before working under the sink.

Step-by-step:

• 1. Observe operation: Run the dishwasher and listen when it drains. Confirm the noise is from the KitchenAid disposal.
• 2. Check hose routing: Ensure the dishwasher drain hose has a high loop under the countertop or is connected to an air gap, preventing backflow.
• 3. Secure hose: Tighten the clamp at the disposal's dishwasher inlet and secure the hose to prevent vibration.
• 4. Inspect for debris: Remove the hose and check the inlet for debris that could cause turbulence.
• 5. Test: Reconnect and run a dishwasher drain cycle to confirm reduced noise.

When to call a technician: If plumbing codes require an air gap and one is not present, a plumber should install it.