Bulb size & fitment reference

Cadillac ATS
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 ATS

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

Headlight High & Low Beam

9012 · Halogen Capsule

View this option →

Reverse Light

Front Side Marker Light

T10 / 194 / 168

Shop this position →

Front Turn Signal

Before You Buy: Factory Lighting Can Vary

Your vehicle may use different factory lighting systems. Check the applicable system before ordering.
Halogen bulb example

Halogen

Halogen bulbs are the standard factory bulbs and are easy to replace.

HID bulb and ballast example

HID

HID bulbs provide higher intensity light and require a ballast.

Full Bulb Fitment by Lighting Position

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

Cadillac ATS (2023–2024) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low Beam9012Halogen CapsuleShop position →
Headlight High & Low BeamD1SHIDShop position →
Front Turn Signal7443Shop position →
Parking Light7443Shop position →
Reverse Light921Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Interior Door LightT10 / 194 / 168Shop position →
Vanity Mirror Light31MMShop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk LightT10 / 194 / 168Shop position →
View Fitment Options →

Cadillac ATS (2019) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low Beam9012Halogen CapsuleShop position →
Headlight High & Low BeamD3SHIDShop position →
Front Turn Signal7443Shop position →
Parking Light7443Shop position →
Rear Turn Signal7443Shop 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 →
Courtesy LightT10 / 194 / 168Shop position →
Glove Box LightT10 / 194 / 168Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk LightT10 / 194 / 168Shop position →
Luggage Compartment LightT10 / 194 / 168Shop position →
View Fitment Options →

Cadillac ATS (2018) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low Beam9012Halogen CapsuleShop position →
Headlight High & Low BeamD3SHIDShop position →
Rear Fog Light912 / 921 / T15Shop position →
Front Turn Signal7443Shop position →
Parking Light7443Shop 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 →
Map LightT10 / 194 / 168Shop position →
Courtesy LightT10 / 194 / 168Shop position →
Glove Box LightT10 / 194 / 168Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk LightT10 / 194 / 168Shop position →
Luggage Compartment LightT10 / 194 / 168Shop position →
View Fitment Options →

Cadillac ATS (2017) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low Beam9012Halogen CapsuleShop position →
Headlight High & Low BeamD3SHIDShop position →
Rear Fog Light912 / 921 / T15Shop position →
Front Turn Signal7443Shop position →
Parking Light7443Shop 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 →
Map LightT10 / 194 / 168Shop position →
Courtesy LightT10 / 194 / 168Shop position →
Glove Box LightT10 / 194 / 168Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Trunk LightT10 / 194 / 168Shop position →
View Fitment Options →

Cadillac ATS (2014–2016) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low Beam9012Halogen; For Vehicle Without Headlamps High Intensity Discharge / Halogen CapsuleShop position →
Headlight High & Low BeamD3SHIDShop position →
Rear Fog Light7443Shop position →
Front Turn Signal7443Shop position →
Parking Light7443Shop position →
Reverse Light912 / 921 / T15Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Side Marker LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Courtesy LightT10 / 194 / 168Shop position →
Glove Box LightT10 / 194 / 168Shop position →
Stepwell LightT10 / 194 / 168Shop position →
View Fitment Options →

Cadillac ATS (2013) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High & Low Beam9012Halogen; For Vehicle Without Headlamps High Intensity Discharge / Halogen CapsuleShop position →
Headlight High & Low BeamD3SHIDShop position →
Rear Fog Light7443Shop position →
Front Turn Signal7443Shop position →
Parking Light7443Shop position →
Reverse Light912 / 921 / T15Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Side Marker LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Courtesy LightT10 / 194 / 168Shop position →
Glove Box LightT10 / 194 / 168Shop position →
Stepwell LightT10 / 194 / 168Shop 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.