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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

Only bulletins with component: Driver assistance are shown. Show all

Bulletins, newest first
25-NA-1182025-09-10. Service bulletin. FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. This service bulletin provides information for the technicians to use a Customer Concern Verification sheet to facilitate the questions needing to be answered by the customer regarding Automatic Emergency Braking (AEB) issues.
25-NA-0702025-04-24. Service bulletin. FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. This service bulletin provides information on Super Cruise IME Recognition.
PIT5551P2024-12-05. Service bulletin. FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. This Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. This is normal when the FAB has been set to "Alert".
24-NA-0902024-06-18. Service bulletin. FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of SuperCruise Unavailable – No road Info: Road Expansion.
N23-2411562023-10-05. Service bulletin. BACK OVER PREVENTION:SOFTWARE. (There may be future updates under this same release number.) Your vehicle keeps getting better. This vehicle software update includes the following: Refinements: •Updates made to the overall vehicle software update process. Better Never Stops™
PIT60502023-09-18. Service bulletin. ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC). This Preliminary information communicates to dealership technicians that if they receive a radio with the 2 stickers as noted above, the radio was remanufactured with missing components and will need to order another radio unit from the ESC to properly repair the vehicle at this time.
23-NA-0422023-07-14. Service bulletin. BACK OVER PREVENTION:SOFTWARE; EQUIPMENT; ELECTRICAL SYSTEM. This service bulletin provides repair information to update radio software to correct customer concerns of Software related issues.
PIT5832H2023-06-13. Service bulletin. BACK OVER PREVENTION. This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication configuration did not complete correctly.
N23-2396592023-05-19. Service bulletin. BACK OVER PREVENTION:SOFTWARE. Your Cadillac keeps getting better. A vehicle software update is ready for you to install which includes the following if your vehicle is equipped: Refinements: Improvements made to Automatic Lane Change feature within Super Cruise. Software improvements to the Super Cruise driver assistance technology. A variety of software improvements to make your in-vehicle experience better. Better Never Stops.
PIT5865B2023-05-15. Service bulletin. FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; LANE DEPARTURE: LANE KEEP: AUTOMATIC STEERING. This Preliminary information communicates an issue with adaptive cruise and lane keep assist inoperative due to an internal issue with the front view windshield camera. Dealers are to replace the camera.
PIT5832G2023-04-17. Service bulletin. BACK OVER PREVENTION; ELECTRICAL SYSTEM:STARTER ASSEMBLY. This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication configuration did not complete correctly.
22-NA-1272023-03-04. Service bulletin. BACK OVER PREVENTION:SOFTWARE; EQUIPMENT:ELECTRICAL. This service bulletin provides repair information on release of Radio Software Version V160 Update to correct customer concerns of radio software issues.
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
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.
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.
PIP5841A2022-06-13. Service bulletin. BACK OVER PREVENTION; SERVICE BRAKES. This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set.
070601016G2022-06-13. Service bulletin. BACK OVER PREVENTION. This informational bulletin provides information on Internal Engine Noise or Damage After Oil Filter Replacement.
PIE0661C2022-06-04. Service bulletin. FORWARD COLLISION AVOIDANCE; ELECTRICAL SYSTEM. This engineering information (EI) closure ends the need for further information from the field in regards to a Forward Collision Icon Message Illuminated on Driver Information Center (DIC) and/or No DTCs Set.
22NA0122022-05-31. Service bulletin. ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SENSORS. This service bulletin provides information for dealers/technicians on Stone Chip/Membrane Damage, Broken Connector and/or Sensor Retaining Tabs, and/or Paint Damage of Park Assist Sensors.
PIE0661B2022-04-02. Service bulletin. ELECTRICAL SYSTEM; FORWARD COLLISION AVOIDANCE. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a Forward Collision Icon Message Illuminated on Driver Information Center (DIC) and/or No DTCs Set.
PIP5817B2022-02-14. Service bulletin. BACK OVER PREVENTION. This Preliminary information communicates to the dealers information related to a hot idle tick noise from the engine. Testing to isolate the noise to the upper engine / valve train and repair recommendations related to valve train components.
PIP5817A2022-02-14. Service bulletin. BACK OVER PREVENTION. This Preliminary information communicates to the dealers information related to a hot idle tick noise from the engine. Testing to isolate the noise to the upper engine / valve train and repair recommendations related to valve train components.
PIC6048N2022-02-14. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN; STEERING; AIR BAGS; LANE DEPARTURE; BACK OVER PREVENTION. This Preliminary Information communicates to the technician that some customers may comment on the operation of their haptic seat during a Lane Keep Assist event. Lane Keep Assist works differently than Lane Departure Warning. The Lane Keep Assist icon is solid amber, Forward Camera Module is actively commanding a torque to Electronic Power Steering. This means that the driver should also feel some feedback from the steering wheel. No Chimes or haptic in the seat. Lane Keep Assist icon is flashing amber; Forward Camera Module is actively commanding torque to Electronic Power Steering. This will also be accompanied with Lane Departure Warning chimes and haptic in the seat feedback based on the setting chosen in the vehicle settings. This will take place when the vehicle has crossed lane marking by (40 cm) or (15.75 in).
PIT5865A2022-01-24. Service bulletin. LANE DEPARTURE: SENSING SYSTEM: OTHER; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL:SOFTWARE. This Preliminary information communicates an issue with adaptive cruise and lane keep assist inoperative due to an internal issue with the front view windshield camera. Dealers are to replace the camera.
PIT58652021-12-13. Service bulletin. FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; LANE DEPARTURE. This Preliminary information communicates an issue with adaptive cruise and lane keep assist inoperative due to an internal issue with the front view windshield camera. Dealers are to replace the camera.

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