Bulb size & fitment reference

Cadillac CTS
Bulb Size Guide

Get the bulb-size answer first, then check factory-system differences and position-specific notes before buying.

Select Your Vehicle

Quick Answer for 2024 Cadillac CTS

Start with the positions you’re most likely to replace. Full fitment details are below.

Headlight High & Low Beam

Reverse Light

Courtesy Light

T10 / 194 / 168

Shop this position →

Dome Light

T10 / 194 / 168

Shop this position →

Full Bulb Fitment by Lighting Position

Find the bulb size for each lighting position and check any fitment notes before ordering.

Cadillac CTS (2023–2024) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low BeamD1SShop position →
Reverse Light921Shop position →
License Plate LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Courtesy LightT10 / 194 / 168Shop position →
Interior Door LightT10 / 194 / 168Shop position →
Glove Box LightT10 / 194 / 168Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2018–2019) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low BeamD3SShop position →
Reverse Light912 / 921 / T15Shop position →
Outer Reverse Light912 / 921 / T15Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Interior Door Light912 / 921 / T15Shop position →
Glove Box Light912 / 921 / T15Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
Luggage Compartment Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2017) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low BeamD3SShop position →
Reverse Light912 / 921 / T15Shop position →
Outer Reverse Light912 / 921 / T15Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Interior Door Light912 / 921 / T15Shop position →
Glove Box Light912 / 921 / T15Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2016) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low BeamD3SShop position →
Reverse Light912 / 921 / T15Shop position →
License Plate LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Courtesy LightT10 / 194 / 168Shop position →
Interior Door Light912 / 921 / T15Shop position →
Glove Box Light912 / 921 / T15Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2015) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low BeamD1SCoupeShop position →
Headlight High & Low BeamD3SSedanShop position →
Fog LightH11Shop position →
Daytime Running Light5202Shop position →
Reverse Light912 / 921 / T15Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Interior Door Light912 / 921 / T15Shop position →
Glove Box Light912 / 921 / T15Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2014) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High BeamH11Halogen CapsuleShop position →
Headlight High & Low BeamD1SV Sedan / HID Headlamps · Base Coupe / HID Headlamps · Base Wagon / HID Headlamps · Luxury Coupe / HID Headlamps · Luxury Wagon / HID Headlamps · Performance Coupe / HID Headlamps · Performance Wagon / HID Headlamps · Premium Coupe / HID Headlamps · Premium Wagon / HID Headlamps · V Coupe / HID Headlamps · V WagonShop position →
Headlight High & Low BeamD3SBase Sedan / Luxury Sedan / Performance Sedan / Premium SedanShop position →
Headlight Low BeamH11Halogen CapsuleShop position →
Fog LightH11Shop position →
Daytime Running Light5202Shop position →
Parking LightT10 / 194 / 168Halogen CapsuleShop position →
Reverse Light912 / 921 / T15Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Interior Door Light912 / 921 / T15Shop position →
Glove Box Light912 / 921 / T15Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2008–2013) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High BeamH11Halogen CapsuleShop position →
Headlight High & Low BeamD1SHIDShop position →
Headlight Low BeamH11Halogen CapsuleShop position →
Fog LightH11Shop position →
Daytime Running Light5202HIDShop position →
Parking LightT10 / 194 / 168Halogen CapsuleShop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Interior Door Light912 / 921 / T15Shop position →
Glove Box Light912 / 921 / T15Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2005–2007) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High Beam9005XS
Headlight Low BeamD1SHIDShop position →
Fog Light9145 / H10Shop position →
Daytime Running Light3157 / 3156Shop position →
Front Turn Signal3157 / 3156FrontShop position →
Front Turn SignalT10 / 194 / 168SideShop position →
Front Inner Turn Signal3157 / 3156Shop position →
Front Outer Turn SignalT10 / 194 / 168Shop position →
Parking LightT10 / 194 / 168Shop position →
Rear Turn Signal3157 / 3156Shop position →
Brake Light3157 / 3156Shop position →
Center High Mount Stop LightT10 / 194 / 168Shop position →
Tail Light3157 / 3156Shop position →
Reverse Light3157 / 3156Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Rear Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Stepwell Light912 / 921 / T15Shop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac CTS (2003–2004) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High Beam9005XS
Headlight Low BeamD1SHIDShop position →
Fog Light9145 / H10Shop position →
Daytime Running Light3157 / 3156Shop position →
Front Turn Signal3157 / 3156FrontShop position →
Front Turn SignalT10 / 194 / 168SideShop position →
Front Inner Turn Signal3157 / 3156Shop position →
Front Outer Turn SignalT10 / 194 / 168Shop position →
Parking LightT10 / 194 / 168Shop position →
Rear Turn Signal3157 / 3156Shop position →
Brake Light3157 / 3156Shop position →
Center High Mount Stop LightT10 / 194 / 168Shop position →
Tail Light3157 / 3156Shop position →
Reverse Light3157 / 3156Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Rear Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Courtesy Light211-2 / 578 / 41MMShop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →
Fitment Reminder
Bulb size can vary by factory setup. If you're unsure which option applies to your vehicle, confirm your current bulb or select your configuration on the product page.