While a "harmonic balancer" sounds like some form of auto-tune, it's actually a necessary component for your car. What happens if it goes bad?

GM has published a service bulletin describing a fix for 2021 Cadillac CT4 sedans with an Engine Control Module that fails to report catalytic converter faults.

You've probably heard about the choke valve in your car engine's carburetor, but what does this seemingly essential component actually do?