2021 Cadillac CT4 Technical Service Bulletins

814 technical service bulletins (TSBs) are on record for the 2021 Cadillac CT4. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10232283Feb 17, 2023Body and structure, Other or unknown, Visibility (wipers, defrost, mirrors). This PI provides information on Rear and Side Tempered Glass Spots (Quench Marks) and that they are a normal characteristic.
• 10232143Feb 17, 2023Equipment. This warranty administration bulletin provides policy information for variable diagnostic time allowances on select labor operations (U.S. Only).
• 10232138Feb 17, 2023Wheels. This service bulletin provides information on summer tire performance and tire cold weather cracking.
• 10232821Feb 16, 2023Equipment. This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication configuration did not complete correctly.
• 10232275Feb 16, 2023Transmission and drivetrain. This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation.
• 10232136Feb 15, 2023Exterior lighting. This service bulletin provides information for dealers/technicians on Exterior Lamp Condensation and Water Leaks and Replacement Guidelines.
• 10232811Feb 10, 2023Equipment. This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
• 10232069Feb 10, 2023Equipment, Latches, locks and linkages, Exterior lighting. This service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking.
• 10232073Feb 7, 2023Transmission and drivetrain, Electrical system. This service bulletin provides information for the technician that may experience a condition when after performing a DTC Clear/Reset on the TCM during diagnosis or after completion of a transmission repair or replacement, the DTCs did not clear or appear to reset on the next engine start.
• 10232066Feb 6, 2023Brakes. This bulletin provides information on possible normal brake drag caused by the vehicle parked for an extended period of time.
• 10231894Feb 2, 2023Equipment, Latches, locks and linkages, Electrical system. This service bulletin provides repair information to correct a customer concern of Child Safety Lock Update failure.
• 10231893Feb 1, 2023Electrical system, 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.
• 10231676Jan 31, 2023Other or unknown. This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication configuration did not complete correctly.
• 10231519Jan 31, 2023Wheels, Tires, Equipment. This service bulletin provides information for tire pressure monitoring (TPM) system concerns.
• 10231518Jan 31, 2023Equipment, Wheels, Tires. This service bulletin provides information for accurate tire pressures that ensure the safe handling and appropriate ride characteristics of GM cars and trucks.
• 10231672Jan 27, 2023Engine cooling. This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set.
• 10231661Jan 24, 2023Equipment. This Preliminary information communicates to the technician that GM is aware of this concern with audio loss and the OnStar LED being red. GM is working on a solution to correct this customers concern.
• 10231507Jan 23, 2023Transmission and drivetrain. This service bulletin provides diagnostic information for technicians in cases of an ETRS system fault or a no start condition - If the vehicle needs to be moved, it is recommended to use wheel dollies, tire skates or the NEW Manual Park Release tool DT-52910.
• 10231487Jan 20, 2023Transmission and drivetrain. This informational bulletin advises the technician of a possibly noise coming from the transmission oil pump.
• 10231407Jan 20, 2023Electrical system, Equipment. This service bulletin provides repair information to correct a customer concern of Head Up Display (HUD) Blank, Non-Responsive to Brightness, Aim, or Page Controls, DTC U0158 Set.
• 10231364Jan 20, 2023Latches, locks and linkages. This service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking.
• 10231302Jan 20, 2023Equipment. This service bulletin provides information for dealers/technicians on When and How to Submit a Field Product Report (FPR) (U.S. Dealers Only).
• 10231645Jan 17, 2023Electrical system, Visibility (wipers, defrost, mirrors). This Preliminary information communicates an issues with the side blind alert icon not working properly after a short range radar is replaced. Dealers are to perform a return to factory settings to correct the issue.
• 10231404Jan 17, 2023Electrical system. 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.
• 10231374Jan 17, 2023Equipment. This warranty administration bulletin provides policy information requirements applicable to key fob replacement under the New Vehicle Limited Warranty or under a Replacement Parts Warranty on 2017-2022 and newer model year vehicles with RPO ATH and AVJ.
• 10231644Jan 13, 2023Electrical system. This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and how to reset/clear the message.
• 10231643Jan 13, 2023Engine cooling. This Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
• 10230612Jan 13, 2023Electrical system. This service bulletin provides information to inform dealership personnel about Law Enforcement and Government vehicles that request to disable or enable content.
• 10230609Jan 12, 2023Transmission and drivetrain. This service bulletin provides a repair procedure to correct a customer concern of Delayed and/or Harsh Engagement of Transmission Shift After Vehicle Sitting with Engine Off.
• 10231628Jan 6, 2023Engine cooling. This Preliminary information communicates the possibility of dtc p0299 due to a stuck open Charge Air Bypass Valve
• 10230603Jan 6, 2023Engine cooling, Electrical system. 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.
• 10230601Jan 6, 2023Electrical system, Transmission and drivetrain. This service bulletin provides information for the technician that may experience a condition when after performing a DTC Clear/Reset on the TCM during diagnosis or after completion of a transmission repair or replacement, the DTCs did not clear or appear to reset on the next engine start.
• 10231623Jan 5, 2023Electrical system. This Preliminary information communicates an issues with false codes setting in vehicles due to timing issues between the modules.
• 10230600Jan 3, 2023Electrical system, Equipment. This service bulletin provides information for dealers/technicians on MDI 2 Required When Programming Vehicles with Vehicle Intelligence Platform (VIP).
• 10228912Dec 23, 2022Wheels. This service bulletin provides information on Dealer Installed LPO Wheel Installation and Return Process.
• 10230706Dec 22, 2022Equipment. This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and how to reset/clear the message.
• 10228906Dec 21, 2022Equipment. This Warranty Administration bulletin provides retail and wholesale service personnel with the policies/procedures and the warranty transaction submission procedures that support the Personal Property Damage process.
• 10230697Dec 15, 2022Visibility (wipers, defrost, mirrors). This Preliminary information communicates to the technician the need to inspect the induction system for potential icing issues in very cold ambient temperatures. To allow the ice to melt so that it can be drained from the related components. That any of the listed DTC's may set with or without poor engine performance.
• 10228888Dec 14, 2022Engine cooling. This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set.
• 10228886Dec 14, 2022Engine cooling. This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and prevent unnecessary engine replacement.
• 10228863Dec 13, 2022Transmission and drivetrain, Engine cooling. This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
• 10228192Dec 7, 2022Equipment. This service bulletin provides information about GM Accessories - Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.
• 10230685Dec 6, 2022Engine cooling. This Preliminary information communicates to dealers? information related to a Malfunction Indicator Lamp (MIL) Illuminated due to a U0672 setting. Advises the technician to perform Electric Engine Coolant Pump connection inspections. To clear the code to see if it resets current. If the code resets it advises to utilize Strategy Based Diagnosis. If the code does not reset, it advises to release the vehicle to the…
• 10228226Dec 6, 2022Brakes. This service bulletin provides information to dealership personnel that after performing a brake inspection, brake pad replacement, or any other repair that requires the caliper piston to be reseated may be causing DTC C05B0 to falsely set for eBoost applications.
• 10230684Dec 5, 2022Electrical system. This Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
• 10230683Dec 5, 2022Electrical system, Equipment. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
• 10228225Dec 5, 2022Transmission and drivetrain. This service bulletin advises the technician that the possible cause may not be from a faulty clutch piston or extension housing and to perform testing on transmission for possible other issues, but it still may be possible on high mile vehicles that orifices in housing may have come dislodged, causing the same customer concern.
• 10230682Dec 2, 2022Equipment, Electrical system. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
• 10227401Nov 30, 2022Equipment, Electrical system. This service bulletin provides diagnostic/repair information to correct a customer concern of Cellphone not Charging or USB Receptacle Inoperative.
• 10227676Nov 29, 2022Equipment. This Preliminary information communicates an issues with the odometer being incorrect after a programming event and how the dealership can resolve the issue.

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