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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: Throttle and cruise control are shown. Show all

Bulletins, newest first
10-08-110-001L2025-02-11. Service bulletin. STRUCTURE:BODY; VEHICLE SPEED CONTROL. This service bulletin provides information on proper use of floor mats.
PIT61272024-03-18. Service bulletin. ELECTRICAL SYSTEM; VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary information communicates a vehicle may come to the dealer with Super Cruise inoperative. On inspection the tech will find code B126B. Tech is given direction on how to update the Map module to restore function. Dealer is also given directions to give to customer to ensure they continue to receive updates.
PIP5848A2023-04-17. Service bulletin. VEHICLE SPEED CONTROL:ACCELERATOR PEDAL. This Preliminary information communicates additional diagnostics for shudder related complaints.
18165 022022-02-07. Service bulletin. ELECTRICAL SYSTEM; VEHICLE SPEED CONTROL. Customer Satisfaction Program. All vehicles equipped with Hands-Free Lane Following (UKL) require control software improvement to optimize the performance of the Super Cruise system. Reprogram the long-range radar and active safety control modules.
18165 012022-02-07. Service bulletin. ELECTRICAL SYSTEM; VEHICLE SPEED CONTROL. Customer Satisfaction Program. All vehicles equipped with Hands-Free Lane Following (UKL) require control software improvement to optimize the performance of the Super Cruise system. Reprogram the long-range radar and active safety control modules.
181652022-02-07. Service bulletin. VEHICLE SPEED CONTROL; ELECTRICAL SYSTEM. Customer Satisfaction Program. All vehicles equipped with Hands-Free Lane Following (UKL) require control software improvement to optimize the performance of the Super Cruise system. Reprogram the long-range radar and active safety control modules.
PIC6312C2020-02-10. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary information communicates diagnostic tips to assist with diagnosis of the Super Cruise system.
N192211740 022019-08-19. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL; EQUIPMENT. Customer Satisfaction Program (revised service procedure and warranty information). General Motors is expanding the mileage of Super Cruise enabled roads to include over 70,000 additional miles (112,000 additional km) by the end of 2019, bringing the total number of Super Cruise enabled roads to over 200,000 miles (320,000 km). In addition to the currently mapped roads, this mileage expansion allows for the Super Cruise driver assistance feature to be engaged on divided, high-speed main roads that contain some limited intersections and traffic control devices. As always, it remains important for drivers to stay engaged and vigilant at all times while Super Cruise is engaged. Reprogram Active Safety Control Module and the Digital Map Control Module.
PIT5569A2019-08-12. Service bulletin. WHEELS; VEHICLE SPEED CONTROL. This Preliminary information communicates direction and examples when diagnosing multiple DTCs, one of which includes U**** Byte 71 DTC.
18165-032019-05-13. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL; ELECTRICAL SYSTEM:SOFTWARE. 18165-03 - Customer Satisfaction Program. All vehicles equipped with Hands-Free Lane Following (UKL) require control software improvement to optimize the performance of the Super Cruise system. Reprogram the long-range radar and active safety control modules.
PIC6265D2018-12-17. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL; LANE DEPARTURE. This Preliminary information communicates that a vehicle may exhibit a Adaptive Cruise Control Unavailable and/or Lane Keep Assist Unavailable message. The technician may attempt to program the Active Safety Control Module (ASCM) and encounter a code E4399. The technician is advised if he encounters this concern to zero the MIC counter by placing the vehicle into and back out of "Transport Mode".
PIC6307N2018-11-13. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary information communicates a parts restriction for the Super Cruse components.
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.
PIC6307H2018-05-21. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary information communicates a parts restriction for the Super Cruise components
PIC6307G2018-05-21. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary information communicates a parts restriction for the Super Cruse components
PIC63212018-02-21. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary Information was created to advise of an over the air update fix coming out for an intermittentSuper Cruise inoperative concern.
PIC63122017-12-14. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary information communicates diagnostic tips to assist with diagnosis of the Super Cruise system.

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