2020 Cadillac CT6 Bulb Size

Starting point: I built this bulb size chart after changing bulbs on my 2020 Cadillac CT6 and feeling frustrated by scattered information. Think of it as a single reference that lists each lamp, its correct bulb type, and common fit notes so you can avoid trial and error. Small win: I include quick wins like the most common replacement sizes and a simple mental model for reading bulb codes. Expand scope by covering headlights, turn signals, and interior lamps so you can match parts across different vendors without confusion. Refine and validate: I tested these fits on my CT6 and cross-checked OEM specs; the chart reflects what worked in practice. Quick recap: this page helps you pick the right bulb faster. Affiliate disclaimer: some links are affiliate links, and I may earn a small commission if you purchase through them, at no extra cost to you.