2020 Cadillac CT4 Technical Service Bulletins

888 technical service bulletins (TSBs) are on record for the 2020 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.

• 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, Exterior lighting, Latches, locks and linkages. This service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking.
• 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, 2023Latches, locks and linkages, Equipment, Electrical system. This service bulletin provides repair information to correct a customer concern of Child Safety Lock Update failure.
• 10231893Feb 1, 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.
• 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, 2023Tires, Wheels, Equipment. This service bulletin provides information for tire pressure monitoring (TPM) system concerns.
• 10231518Jan 31, 2023Equipment, Tires, Wheels. This service bulletin provides information for accurate tire pressures that ensure the safe handling and appropriate ride characteristics of GM cars and trucks.
• 10231520Jan 30, 2023Back-over prevention (rear camera), Equipment. This service bulletin provides information for customers/dealers/technicians on Normal Camera Display Operation - Flashing Diamond - Spot - or UFO like image on Camera Display.
• 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.
• 10231407Jan 20, 2023Equipment, Electrical system. 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).
• 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.
• 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.
• 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.
• 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, 2023Equipment, Electrical system. 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.
• 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, 2022Engine cooling, Transmission and drivetrain. 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.
• 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, 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.
• 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.
• 10227674Nov 29, 2022Wheels, Tires. This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized, tested and designed for the vehicle in question and its applications. Technician should not use the information that is provided by the antilock braking system tire size selection.
• 10227671Nov 21, 2022Electrical system. This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication configuration did not complete correctly.
• 10227241Nov 18, 2022Transmission and drivetrain, Engine cooling. This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and information on Submission of Warranty Transaction in Global Warranty Management.
• 10227056Nov 9, 2022Engine cooling. This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
• 10227654Nov 1, 2022Electrical system. This Preliminary information communicates an issues with the odometer being incorrect after a programming event and how the dealership can resolve the issue.
• 10226396Oct 27, 2022Transmission and drivetrain. This Preliminary information communicates a parts restriction is in place for the Automatic Transmission Control on 2020 Cadillac CT4, and CT5.
• 10225711Oct 25, 2022Engine cooling, Electrical system. This service bulletin provides a procedure to repair a customer concern of Stop/Start System Inhibited / IBS / Battery Monitor with Module Malfunction Indicator Light (MIL) Illuminated - DTC U152D, P15FF, P305D, P305E, U01B0 Set.
• 10225615Oct 19, 2022Electrical system. This service bulletin provides information on Module Harvesting.
• 10225606Oct 17, 2022Electrical system, Equipment, Engine cooling. 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.
• 10225596Oct 10, 2022Wheels, Transmission and drivetrain. 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.
• 10224820Oct 7, 2022Equipment. This service bulletin provides information for dealers on how to submit a product information report (PIR) (Canada Only).

← All problems reported for the 2020 Cadillac CT4