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Service bulletins for the 2018 Cadillac CT6

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.

1096 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
PIC63422018-12-17. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates to the dealer technician that U0100 can currently set for a loss of communications with either the TCCM or the ECM and further diagnostics will be required to determine which module is at fault.
PIC6307P2018-12-17. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a parts restriction for the Super Cruse components.
PIC6288A2018-12-17. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This Preliminary information communicates a possible P1FFE for a stuck sensor after Repair. This explains that air pocket could cause the sensor to get stuck. It explains the process for resting the sensor float.
PIC6231B2018-11-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician about vehicles EV range is less than expected, or the estimated EV range on the display is greater than the actual range achieved. Dealer should walk the customer though using the energy screen. The energy screen will help the customer understand were there battery energy is being used.
PIC63392018-10-15. Service bulletin. STEERING; ELECTRICAL SYSTEM. This Preliminary information communicates to the dealer technician the need to disconnect the Steering Column Friction Control Module to correctly diagnose B290A SYM49.
PIC6272C2018-10-15. Service bulletin. ELECTRICAL SYSTEM. The Preliminary Information communication advises the technician that the Technical Assistance Center has a Parts Restriction for Drive Motor Battery.The dealer technician is advised to call the GM Technical Assistance Center for further assistance.
PIP5095F2018-09-17. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon and may also have an oil or coolant leak. Technician may find coolant or oil in a spark plug tube. If the Spark Plug Tube is leaking and it is determined that the oil or coolant is not coming from a leak above the spark plug then replace the cylinder Head, spark plug and coil.
174792018-08-20. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. 17479 - Customer Satisafaction Program. A software update package is available for vehicles with Super Cruise. The enhanced Super Cruise software will improve lane centering and add descriptive instrument cluster messaging that will allow drivers to better understand why Super Cruise is unavailable or why Super Cruise needs to disengage and return control to the driver. System performance will be enhanced. Easier to Engage Super Cruise. Adaptive Cruise Control provides smoother acceleration and braking behavior. Dealers are to update the Super Cruise software, and provide the customer with an owner manual insert that outlines the new available cluster messaging.
PIP5373B2018-08-06. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This Preliminary Information communication provides the technician with steps on how to program an Engine Control Module when getting a Service Programming System error code E4491 or E4423. In some cases Techline Customer Support Center may need to be contacted to resolve the issue.
174792018-08-06. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. 17479 - Customer Satisafaction Program. A software update package is available for vehicles with Super Cruise. The enhanced Super Cruise software will improve lane centering and add descriptive instrument cluster messaging that will allow drivers to better understand why Super Cruise is unavailable or why Super Cruise needs to disengage and return control to the driver. System performance will be enhanced. Easier to Engage Super Cruise. Adaptive Cruise Control provides smoother acceleration and braking behavior. Dealers are to update the Super Cruise software, and provide the customer with an owner manual insert that outlines the new available cluster messaging.
PIT5399A2018-06-18. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician about connectivity concerns when connecting an Apple device via USB cord. Technician should insure the customer is using an original equipment manufacturer Apple USB cable.
16-NA-3712018-06-11. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This informational bulletin explains how the technician no longer needs to perform the 3 hour battery relearn procedure on 2017-2018 vehicles with Start/Stop.
03-08-46-004T2018-06-11. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information on OnStar® VCIM is currently restricted parts. By working closely with our dealers and technicians, through the part restriction process, the General Motors team will gain a better understanding of any field concerns that may develop.
180652018-06-04. Service bulletin. WHEELS:HUB; WHEELS; ELECTRICAL SYSTEM; EQUIPMENT. 18065 - Service Update. A splash shield in the right front hand wheel house may have not been installed. Customers may experience a no start condition due to debris and water entering the impacted area covered by the shield. Dealers are to install a splash shield if it is missing. They should also inspect the two ring terminals (starter / ground) within the impacted area for corrosion and clean the area as necessary.
150603002K2018-06-04. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT. This informational bulletin provides information on approved warranty part numbers for original equipment batteries
150603001D2018-06-04. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This informational bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and testing those batteries.
060089026N2018-06-04. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY:SUN/MOON ROOF ASSEMBLY; STRUCTURE:BODY:DOOR; POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE); VISIBILITY:WINDSHIELD; ELECTRONIC STABILITY CONTROL (ESC). This warranty bulletin provides labor operation numbers for customer concerns that cant be duplicated.
17NA0742018-06-04. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This informational bulletin provides information and Tips for Customers Having Difficulty Launching Android Auto or Apple CarPlay.
150603002J2018-06-04. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This informational bulletin provides information on approved warranty part numbers for original equipment batteries
150603002I2018-06-04. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information on approved warranty part numbers for original equipment batteries
150603001C2018-06-04. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and testing those batteries.
17NA3602018-06-04. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This informational bulletin explains to the technician to charge the battery if the vehicle battery is discharged during transport.
070604019F2018-06-04. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This technical bulletin provides repair information for repairing the IP to body harness connector to correct a customer concern for intermittent Malfunction Indicator Lamp (MIL) illuminated with Reduced Engine Power displayed and DTC P2138 set.
17NA1422018-06-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This informational bulletin provides information on Wireless Charging Module Diagnosis and cell phone compatibility.
17-NA-0672018-05-21. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information on On rare occasions, a security code input message with SPS error code E5659, M5304, and/or M5530 may be displayed in TIS2web when the technician is programming any module. If this concern is encountered, the technician should start by ensuring that the module being programmed is not a used module and that the VIN matches on VIN plate, TIS2web programming screen, and GDS2 module identification information screen.

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