Why is the car's turn signal flashing very fast?

[RicardoLee]

The main reasons why a car's turn signal flashes very fast are: 1. A burnt-out turn signal bulb. Generally, turn signal bulbs such as the turn signal, front fender light, cornering light, or rear turn signal - if any of these bulbs are burnt out, it may cause the flashing frequency to become too fast during turns. 2. Poor contact in the turn signal: such as loose bulbs or poor plug connections. 3. Faulty bulb control relay: The relay controlling the turn signal light system circuit may be the cause. 4. Lighting circuit faults: Multiple reasons including poor wiring connections, poor grounding, incorrect bulb installation, rust, etc.