The service and repair manual for the 2021 Cadillac CT4 — 2.7L I4 and 2.0L I4 engines, 4 trims. Matched to this exact model year, so the specifications and sequences are the ones Cadillac published for your car, not figures carried over from a neighbouring year.
01 / FitmentWhat this manual covers
| Model year | 2021 |
|---|---|
| Engines | 2.7L I4 — 166 cu in, DOHC, turbocharged 2.0L I4 — 122 cu in, DOHC, turbocharged |
| Trims | V Sedan 4-Door · Sport Sedan 4-Door · Luxury Sedan 4-Door · Premium Luxury Sedan 4-Door |
| Federal record | 2 recalls · 8 complaints · 802 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 2021 CT4 manual
03 / ContentsSections in the manual
- Quick Lookups 783
- General Information 1,984
- Accessories & Equipment 11,390
- Heating, Ventilation & A/C (HVAC) 777
- Body & Frame 2,967
- Maintenance 11
- Brakes 1,632
- Restraints 578
- Drivelines & Axles 331
- Steering 354
- Electrical 4,821
- Suspension 333
- Engine Mechanical 1,716
- Transmission 1,081
- Engine Performance 4,193
- Loosen 45
04 / Known issuesRecalls on federal record for the 2021 CT4
- Exterior Lighting — lighting control module › software · 22V903000Drls that do not deactivate as intended may result in a glare, reducing visibility, and increasing t.
- Air Bags — side/window › curtain · 21V611000Air bags that do not deploy properly can increase the risk of injury in a crash.
Owners have filed 8 complaints and Cadillac has issued 802 technical service bulletins for the 2021 CT4. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 2021 CT4 manual
Is this manual specific to the 2021 CT4?
Yes. It is the OEM manual matched to the 2021 model year, covering the 2.7L I4 and 2.0L I4 across the V Sedan 4-Door, Sport Sedan 4-Door, Luxury Sedan 4-Door, Premium Luxury Sedan 4-Door trims. Specifications and procedure sequences are the ones Cadillac published for this year.
What 2021 CT4 problems does it help with?
2 recalls are on federal record for the 2021 CT4, covering exterior lighting, air bags. The manual carries the manufacturer's diagnostic and repair procedures for those systems; the recall repairs themselves are done free by Cadillac dealers.
Does it include 2021 CT4 wiring diagrams?
Yes — the complete wiring diagrams for the 2021 build, alongside repair procedures, specifications and diagnostics.
Is it a subscription?
No. $49.99 once and the manual is yours. It is a digital manual — nothing ships; access details arrive by email after checkout and it works on any device.
RelatedOther CT4 years and 2021 Cadillac models
2024 CT4 · 2023 CT4 · 2022 CT4 · 2020 CT4 · all 5 years
2021 Cadillac CT5 · 2021 Cadillac Escalade · 2021 Cadillac Escalade ESV · 2021 Cadillac XT4 · 2021 Cadillac XT5 · 2021 Cadillac XT6 · every 2021 model