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Service bulletins for the 2021 Cadillac CT4

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

813 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Bulletins, newest first
PIT4261H2022-08-15. Service bulletin. EQUIPMENT; TIRES. This Preliminary Information communication provides information to the technician about vehicles with tire sidewall irregularities. This is a visual condition that will not affect durability, reliability or performance of the tires. Dealer should communicate to the customer that slight sidewall indentations are a common characteristic of radial tire construction.
21-NA-1892022-08-04. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. This service bulletin provides information on Super Cruise Escalation Cancellation.
21-NA-2442022-08-03. Service bulletin. EQUIPMENT. This service bulletin provides a repair procedure to correct a customer concern of a No Fob detected message on Driver Information Center (DIC) and/or No Crank / No Start condition.
18-NA-3062022-08-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Warranty Administration service bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA).
04-00-89-015X2022-08-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides information on Warranty Administration – Required Operating Procedures - 8 Points (U.S. Only).
PIC5260F2022-07-25. Service bulletin. VISIBILITY:SUN/MOON ROOF ASSEMBLY. This Preliminary Information communication advises the technician the steps on diagnosing the concern. Customer's sunroof operation intermittent, bind, noise, auto-reverse, and/or water leaks.
PIT5913A2022-07-25. Service bulletin. BACK OVER PREVENTION:DISPLAY FUNCTION. This Preliminary information communicates a condtion where SD card removed is being displayed on the radio display intermittently. ThisPI advises that engineering is working on a fix for this issue
PIT5099F2022-07-25. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
22NA0442022-07-18. Service bulletin. STRUCTURE; ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM; ELECTRICAL SYSTEM. Check Engine MIL Illuminated in DIC Set by Body Control Module with DTC P0607
22NA0312022-07-18. Service bulletin. SEAT BELTS; AIR BAGS; EQUIPMENT:ELECTRICAL:INFOTAINMENT; ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM. Child Safety Lock with Update Unsuccessful Message on Infotainment Screen.
22-NA-1352022-07-12. Service bulletin. EQUIPMENT. This warranty admin bulletin covers information on Essential Tools that include Consumable Parts.
22-NA-0942022-07-12. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This service bulletin provides repair information to correct a customer concern of a loss of cabin heat.
22-NA-0912022-07-12. Service bulletin. POWER TRAIN. This service bulletin provides repair procedure information to correct a customer concern of a Rear Axle Moan Type Noise During Left or Right Turns.
12-01-37-001F2022-07-12. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This service bulletin provides information to dealership personnel on a new refrigerant (R1234yf) for A/C service.
22-NA-1262022-07-12. Service bulletin. FORWARD COLLISION AVOIDANCE. This service bulletin provides repair information to correct a customer concern of Automatic Emergency Braking (AEB) Forward Collision Icon Lamp On with No DTCs Present.
22-NA-1152022-07-12. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This service bulletin provides information for U.S. dealers ONLY to refer to the Battery Maintenance Report to identify vehicles in dealer inventory that require attention.
22-NA-0702022-07-12. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This service bulletin provides information for replacement parts traceability (RPT) process to aid in tracking part replacements.
21-NA-1882022-07-12. Service bulletin. EQUIPMENT. This service bulletin provides service information/procedures on continuous improvement Radio Software Version V158 Update to address customer comments on software related issues.
21-NA-0262022-07-12. Service bulletin. EQUIPMENT. This service bulletin provides information for dealers/technicians on accessory all-weather floor liners and flat mats warped or misshapen.
22-NA-0092022-07-01. Service bulletin. ENGINE AND ENGINE COOLING. This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
20-NA-1592022-06-25. Service bulletin. WHEELS. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
22NA0282022-06-21. Service bulletin. BACK OVER PREVENTION. This service bulletin provides a repair procedure to correct a customer concern of a Whining/Whirring, Whistle, Squeaking, Groaning/Growling Noise Coming from Front Wheel/Engine Area.
21NA1352022-06-21. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This service bulletin provides information to inform dealership personnel about Law Enforcement and Government vehicles that request to disable or enable content.
21NA2752022-06-21. Service bulletin. WHEELS; SERVICE BRAKES. This service bulletin provides repair information to correct customer concerns of Rear Wheel Lock Up, ABS Event, Loud Bang and a Flashing ?D? on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.
21NA1312022-06-21. Service bulletin. SEATS:FRONT ASSEMBLY:POWER ADJUST; ELECTRICAL SYSTEM. This service bulletin provides repair information to correct a customer concern of Memory Seat Module Does Not Adjust.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.