2021 Cadillac CT4 Service and Repair Manual

This factory service and repair manual for the 2021 Cadillac CT4 is matched to this exact model year, engine and trim, covering the 2.0L L4 (VIN K, LSY) and 2.7L L4 (VIN L, L3B) turbocharged engines with the specifications and torque sequences Cadillac published for this car, not figures borrowed from another year.

Engines covered

• 2.7L inline-four (166 cu in) — DOHC, turbocharged, gasoline
• 2.0L inline-four (122 cu in) — DOHC, turbocharged, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Luxury
• Premium Luxury
• Sport
• V

Known issues on the 2021 CT4. Four recalls are on federal record for this model year. The first covers the roof rail side-curtain air bags, which may not have been installed correctly and can deploy improperly in a crash. The second covers the communications gateway module, which can incorrectly process a loss of communication with the sensing diagnostic module and cause the air bag malfunction indicator light to fail to warn the driver of a problem. The third covers the daytime running light software, which may not deactivate when the headlights are on, producing glare that reduces visibility. The fourth covers the 10-speed automatic transmission, which can become internally damaged and cause the wheels to lock up while driving. Owners have filed 7 complaints for the year. The factory diagnostic and repair procedures behind each of those systems are here.

From an air bag system fault to a transmission wheel-lockup diagnosis or a routine service interval, it keeps you on the OEM procedure and the correct specification for your specific 2021 CT4.