Modern Cars: How Over-Reliance on Electronics Sacrifices Reliability

We expect our cars to start reliably every morning. In 1952, this meant trusting that a lead-acid battery would retain its charge overnight, that starter switch contacts would conduct current, and that the starter motor’s 30 electromagnetic loops would respond to 200 amps with precision. It meant relying on ignition points and coils to generate voltage spikes that would jump spark plug gaps at the right moment. It meant pistons moving in perfect sync to create the air depression needed to vaporize fuel into an ignitable mixture.

These were purely analog processes—amps, air depressions, fuel evaporation, sparks, and controlled explosions—all governed by predictable physics. If the pistons sealed properly, the rest of the system followed suit. The engine started. The process was reliable.

From Analog to Digital: The Hidden Cost of Convenience

Today, we still depend on these analog events occurring flawlessly. But now, they are overlaid with dozens of microchips and millions of lines of code. The result? A system that mostly works—but not always. As one computer engineer noted in the 1980s, “Don’t worry about how a computer actually works; be amazed that they work at all.”

That sentiment holds true for modern automobiles. My Audi A7’s electronic control unit manages most functions, often without driver input. The throttle pedal isn’t mechanically linked to the throttle body; instead, redundant sensors and servo motors interpret my input, adjusting power delivery based on what the system thinks I need—not what I actually demand. Engaging Sport mode doesn’t just adjust throttle response—it redefines it, prioritizing speed over precision. The result? A driving experience that sometimes feels more like a video game than a traditional drive, complete with a 100-millisecond delay between pressing the pedal and acceleration.

The Fragility of Digital Dependence

As my Audi ages, I grow more aware of the day when the system’s “ghosts” take over permanently. So far, at nearly 100,000 miles, the only issue has been an erratic rear spoiler that deploys on its own—despite no other apparent problems. A quick forum search revealed this behavior is often linked to a failing AGM battery. The connection between low voltage during cranking and a misfiring hexadecimal code for the rear spoiler’s electric motor is baffling, yet undeniable. It’s a gremlin in the machine—one that highlights how deeply embedded electronics can introduce unpredictable failures.

Modern cars are engineering marvels, but their reliability is increasingly tied to the flawless operation of digital systems. When those systems fail, even the most mundane components can behave unpredictably. The question remains: Are we trading reliability for convenience?