What Causes the Clicking Sound When Starting an Automatic Transmission Car?

[DeAurora]

Automatic transmission cars produce a clicking sound when starting due to internal transmission issues and excessively low engine RPM. Internal transmission problems: Excessive wear creates gaps, resulting in play during startup which causes abnormal clicking noises. Excessively low engine RPM: Insufficient output torque can cause gear dragging, potentially leading to abnormal sounds. During rapid acceleration when engine RPM rises extremely quickly, the transmission may produce an impact when shifting from 1st to 2nd gear. When heavily pressing the accelerator to raise RPM to 5,000-6,000 or higher, the transmission must suddenly reduce this RPM to 2,000-3,000 through gear shifting to stabilize engine speed, creating impact at this moment. Maintenance methods: Replace transmission fluid and perform comprehensive transmission maintenance. Additionally, avoid aggressive daily driving to prevent accelerated transmission wear. Another important note: regardless of gear shifting operation, always use the foot brake to completely stop the vehicle first.