Engine Coolant
50/50 mixture of clean, drinkable water and use only DEX-COOL Coolant. See Cooling System 0 317.
Applies to: Engine Coolant
Owner’s manual specs
2021 Cadillac CT4 Specs: Oil Capacity, Fluids, Maintenance Schedule & Fuse Box
Figures for the 2021 Cadillac CT4, copied from Cadillac’s own owner’s manual. Every one links to the manual page it came from.
From the manufacturer’s manuals. Every figure here is copied from the manufacturer's own manual, with a link to the page it came from. Where a manual is unclear or contradicts itself, we leave the figure out.
Fluids & capacities
All engines
Engine Cooling System*
11 qt
Applies to: 10.4 L
Engine Oil
Engine oil meeting the dexos1 specification of the proper SAE viscosity grade. ACDelco dexos1 full synthetic is recommended. See Engine Oil 0 312.
Applies to: Engine Oil
5.0L
Engine Oil with Filter
5.3 qt
Applies to: 5.0 L · with filter
Maintenance schedule
Normal service schedule
Use this for ordinary driving.
| Service | When |
|---|---|
| If the vehicle is not equipped with the engine air filter life system, replace engine air cleaner filter. (3) | Every 45,000 mi(72,000 km) |
| Replace passenger compartment air filter. (2) | Every 22,500 mi(36,000 km) |
Severe service schedule
Use this if you tow, idle a lot, drive short trips in the cold, or run in dust.
| Service | When |
|---|---|
| Change automatic transmission fluid and filter. | Every 45,000 mi(72,000 km) |
| If the vehicle is not equipped with the engine air filter life system, replace engine air cleaner filter. (3) | Every 45,000 mi(72,000 km) |
| Replace passenger compartment air filter. (2) | Every 22,500 mi(36,000 km) |
Fuse box locations & fuse chart
Engine Compartment Fuse Block
Where to find it
Engine Compartment Fuse Block The engine compartment fuse block is on the driver side of the engine compartment.
Lift the fuse block cover to access the fuses.
What each fuse protects
| Fuse | Amps | Protects | Source |
|---|---|---|---|
| 1 | — | Long range radar front sensor | p.333 |
| 2 | — | Park/Daytime running lamps | p.333 |
| 3 | — | Exterior lighting module 4 | p.333 |
| 7 | — | Electronic brake control module | p.333 |
| 8 | — | Washer pump | p.333 |
| 13 | — | Front wiper | p.333 |
| 14 | — | Exterior lighting module 6 | p.333 |
| 15 | — | Exterior lighting module 1 | p.333 |
| 16 | — | Exterior lighting module 5 | p.333 |
| 17 | — | Exterior lighting module 3 | p.333 |
| 18 | — | Aero shutter | p.333 |
| 21 | — | Virtual key system/ Power sounder module | p.333 |
| 22 | — | Engine control module | p.333 |
| 23 | — | Transmission control module/Transmission reverse lock out | p.333 |
| 24 | — | Active engine mount | p.333 |
| 26 | — | Engine control module | p.334 |
| 27 | — | Injectors/Ignition 2 | p.334 |
| 28 | — | Charged air cooler | p.334 |
| 29 | — | Transmission aux oil pump/Transmission reverse lock out | p.334 |
| 30 | — | Injectors/Ignition 1 | p.334 |
| 31 | — | Emissions 1 | p.334 |
| 32 | — | Emissions 2 | p.334 |
| 33 | — | Starter solenoid | p.334 |
| 36 | — | Starter pinion | p.334 |
| 37 | — | AC clutch | p.334 |
| 48 | — | Front wiper speed | p.334 |
| 49 | — | Front wiper control | p.334 |
| 52 | — | Engine control module | p.334 |
| 53 | — | Starter solenoid | p.334 |
| 54 | — | Starter pinion | p.334 |
| 57 | — | AC clutch | p.334 |
Instrument Panel Fuse Block
Where to find it
Instrument Panel Fuse Block The instrument panel fuse block is in the end of the driver side of the instrument panel.
remove the end panel by gently prying with a plastic tool near each clip, beginning at the point shown.
What each fuse protects
| Fuse | Amps | Protects | Source |
|---|---|---|---|
| 1 | — | Run after park/ Accessory | p.336 |
| 7 | — | Air quality ionizer | p.335 |
| 8 | — | Heated steering wheel | p.335 |
| 10 | — | Electronic steering column lock 1 | p.335 |
| 18 | — | Display/Infotainment/ USB/Multi-function control module | p.336 |
| 19 | — | Airbag/ Automatic occupant sensing / Data link connection/ Wireless charging module/ Virtual key module | p.336 |
| 20 | — | Power steering column module/ Electronic steering column lock 2 | p.336 |
| 21 | — | Driver monitor system/Performance data recorder | p.336 |
| 25 | — | USB | p.336 |
| 31 | — | Headlamp level | p.336 |
| 33 | — | Body ignition/IP ignition | p.336 |
| 34 | — | Exhaust valve | p.336 |
| 35 | — | Transmission control module ignition/ Engine control module ignition/Shift ignition/Brake ignition | p.336 |
| 36 | — | Shift module | p.336 |
| 37 | — | Body control module 1/Electronic park brake switch | p.336 |
| 39 | — | Steering wheel controls | p.336 |
| 40 | — | Body control module 2 | p.336 |
| 41 | — | Body control module 3 | p.336 |
| 42 | — | Body control module 4 | p.336 |
Rear Compartment Fuse Block
Where to find it
Rear Compartment Fuse Block The rear compartment fuse block is behind a cover on the driver side of the rear compartment.
What each fuse protects
| Fuse | Amps | Protects | Source |
|---|---|---|---|
| 1 | — | Remote function actuator | p.337 |
| 3 | — | Driver heated seat | p.337 |
| 4 | — | Fuel tank zone module | p.337 |
| 10 | — | Motor seat belt passenger | p.337 |
| 11 | — | Canister vent solenoid | p.337 |
| 12 | — | Sunroof | p.337 |
| 15 | — | Passenger heated seat | p.337 |
| 17 | — | Electronic suspension control | p.338 |
| 19 | — | Motor seat belt driver | p.338 |
| 20 | — | Rear defog | p.338 |
| 21 | — | DC to DC transformer 2 | p.338 |
| 22 | — | Driver power window / Door handle switch | p.338 |
| 23 | — | External object calculating module/ Front camera module/High definition localization/Short range radar | p.338 |
| 24 | — | Passenger power window / Door handle switch | p.338 |
| 31 | — | DC to DC transformer 1 | p.338 |
| 32 | — | Transfer case electronic control | p.338 |
| 33 | — | Central gateway module/Side blind zone alert | p.338 |
| 34 | — | Video processing module | p.338 |
| 35 | — | Hands free closure release | p.338 |
| 36 | — | Exterior lighting module 2 | p.338 |
| 37 | — | Passenger memory seat module | p.338 |
| 39 | — | Right front/Right rear window | p.338 |
| 43 | — | Park assist module | p.338 |
| 44 | — | Driver memory seat module | p.338 |
| 45 | — | OnStar | p.338 |
| 50 | — | Driver seat | p.338 |
| 51 | — | Left front/Left rear window | p.338 |
| 52 | — | Passenger seat | p.338 |
| 55 | — | Run | p.338 |
More fuse pages in the manual
Diagrams and printed legends we can’t host. Check the box name printed on a diagram before counting positions.
Not on this page
- Oil life & reset procedures: We're still checking these figures.