Why is the D gear flashing in an automatic transmission?

[LeMarcus]

Automatic transmission car D gear light flashing may indicate issues with the transmission or battery. Below is relevant information about automatic transmissions: 1. Automatic principle: The engine's power is transmitted through the gearbox, which is also a key factor affecting fuel consumption. Generally, automatic transmissions consume 10% more fuel than manual transmissions. Whether manual or automatic, more gears mean better fuel efficiency. 2. Driving techniques: For manual transmission vehicles, upshifting should be done at higher RPMs. Engines are designed to operate at higher RPMs, with various components' dynamic balance and rotational inertia parameters set accordingly. Prolonged operation at abnormal RPMs increases internal component load and wear, often causing vibration and knocking, which affects lifespan. Selecting 3000 RPM as the upshift point ensures post-shift operation at around 2300 RPM, keeping the engine within its healthy operating range.