What percentage of all automotive systems are controlled by electronics?

• A. 86%
• B. 50%
• C. 75%
• D. 95%

Answer: (A)

The main idea is that electronics now run the vast majority of automotive functions. Modern vehicles use many electronic control units (ECUs) connected by networks to manage engine tuning, transmission, braking (ABS/EDS), stability control, airbags, climate control, lighting, power accessories, and even infotainment. Because of this widespread electronic control, the typical estimate sits in the high 80s. The figure around 86% best reflects how extensive electronic control has become, without assuming every single function is electronic.

The other numbers don’t fit as well: 50% would grossly understate how many systems are electronics-driven, 75% underestimates the scope, and 95% would imply nearly all functions are electronic with little if any purely mechanical control, which isn’t accurate across all vehicles and older designs.