What should you do with a D4 transmiton gear light flashing?

If the D4 transmission gear light is flashing, it typically indicates a problem with the transmission system. First, check the Transmission Fluid level and condition, as low or dirty fluid can cause issues. If the fluid is fine, it’s advisable to consult the vehicle's manual for specific guidance and seek professional diagnostic help, as continued driving could lead to further damage. Avoid driving the vehicle until the issue is resolved to prevent potential transmission failure.