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Service bulletins for the 2016 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.

1371 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Bulletins, newest first
00-06-01-026F2017-08-15. Service bulletin. ENGINE AND ENGINE COOLING. This informational bulletin provides information to technicians regarding intake manifold inspection/replacement after severe internal engine damage.
PI0091B2017-08-15. Service bulletin. EQUIPMENT. This preliminary informational bulletin provides repair information to correct a customer concern of Iitermittently key will not rotate in door or ignition lock cylinder.
11-08-49-001O2017-08-15. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM. This technical bulletin provides repair procedure information to correct a customer concern of Transport Mode On message displayed in Driver Information Center (DIC) and/or battery light is flashing.
02-08-42-001H2017-08-15. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin provides information to assist dealership personnel with the identification of vehicle headlamp, tail lamp, license lamp or fog/driving lamp damage that are not considered warrantable.
15-00-89-0042017-08-15. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This informational bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered seepage.
PIP5388B2017-08-15. Service bulletin. EQUIPMENT:MECHANICAL; ENGINE AND ENGINE COOLING. This Preliminary Information communication advises the technician that the 3.0L LGW engine is no longer on exchange and can be ordered directly from their parts distributor.
PIP5403A2017-08-15. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. This Preliminary Information communication advises the technician that vehicles equipped with an 3.0L twin turbo charged engine no longer need to contact PQC to order the ECM the restriction has ended.
PIC6137C2017-08-15. Service bulletin. ENGINE. This Preliminary Information communication provides information to the technician about vehicles that the engine stops running after extended idle with shifter in park. Dealer should communicate to the customer this condition is a normal operating characteristic of their vehicle. If the customer exits the vehicle with the fob in their possession while the engine is running and the shifter is left in park, the engine will shut off after 1 - 2.5 hours depending on model year. If the customer is sitting in the vehicle with the engine running and the fob is in the vehicle, the Passive Entry Passive Start system will reach out and look for the fob after 1 - 2.5 hours depending on model year. If the fob is located, the timer will reset an additional 1 - 2.5 hours depending on model year.
PIT5389C2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This Preliminary Information communication provides information to the technician about vehicle that may have an OnStar system that has progression tones when pressing the blue or red button. Technician will need to call General Motors Technical Assistance Center with the scan tool data from the OnStar system.
PIC4935F2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This Preliminary Information communication provides information to help the dealership technicians perform a parasitic drain test for the OnStar module. When performing battery parasitic drain test, there may be some confusion as to what the normal power consumption reading should be from the OnStar system.
PIP4723B2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8 starting/charging tester and Vehicle Data Recorder tools, giving website address and step by step instructions to complete the update.
PIC5959C2017-08-15. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. This Preliminary Information communication provides information to the technician about vehicle that has no XM audio on certain channels but XM channel info is displayed. Technician will need to contact XM and deactivate and activate the module.
PIC4801H2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicles that may have an OnStar Turn-By-Turn Navigation the system that is inoperative. Technician verifies there are no Diagnostic Trouble Codes are present in the Antilock Braking System and Vehicle Communication Interface Module of the vehicle. If no Diagnostic Trouble Codes found call OnStar using the Blue button on the OnStar key pad and ask the advisor for a turn by turn route. Also make a OnStar personal call and a call into the vehicle. If normal diagnostics do not lead to a resolution technician will need to call General Motors Technical Assistance Center for further assistance.
PIC3278G2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; STEERING. This Preliminary Information communication provides information to the technician the steps needed to diagnose and repair the vehicles that may have unwanted or phantom phone calls. Technician will need to determine what type of call the customer is having that is unwanted. The vehicle may receive an incoming call just like any other phone. Typically the customer will hear the phone ringing in the vehicle. This scenario also includes incoming Bluetooth calls. One type of unwanted call can be made if the key pad is faulty the OnStar system will try to make a blue button call for shorted voltage in the circuits. The OnStar module could have an internal fault and produce a ″Phone Unavailable″ audio message also it may have a Diagnostic Trouble Code U1500 or B1000. Refer to diagnostics for the Diagnostic Trouble Code making sure to follow any applicable Bulletins or Preliminary Information sheets. A “Ready” or “OnStar ready” audio message heard while driving. In some cases it has been found that the customer is inadvertently pressing the ″push to talk″ button on the steering wheel controls. On rare occasions, other issues in the steering column or Steering Wheel Control system may induce this concern.
PIC5588C2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This Preliminary Information communication provides information to the technician on the programming and activation of the OnStar system. For many 2008 and prior model year GM vehicles, the programming is performed using the Tech 2 and the activation is initiated by a Service Programming System. For the 2010 and UP model year vehicles, the OnStar set-up procedure and OnStar Activation request have been combined into a single programming event called OnStar Set-up and Activation in Service Programming System.
PIP5029H2017-08-15. Service bulletin. ENGINE. This Preliminary Information communication provides information to the technician about vehicles that have a Malfunction Indicator Lamp on or engine misfire, rough idle, extended crank, or crank no start in some cases. Technician will need to perform published Service Information diagnostics. If technician finds carbon, an upper engine and valve cleaning should be performed. Update added part numbers for the cleaner and model years.
PIC6049F2017-08-15. Service bulletin. ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. This Preliminary Information communicationends thewireless charging module restriction through the General Motors Technical Assistance Center.
PIP5338A2017-08-15. Service bulletin. EQUIPMENT. This Preliminary Information communication provides information to the technician about vibration complaints that are one of the most challenging complaints to accurately diagnose and repair. Technician will need to use Pico Oscilloscope Diagnostic Kit to effectively diagnosis vehicles. Technician should drive the vehicle will using the Pico Oscilloscope to record data. After the data is recorded it should be reviewed to determine the root cause of the concern. If a repair attempt made the concern better but not eliminated or had no affect at all, and are requesting assistance from General Motors Technical Assistance Center record another Pico file and save it to the computer. After the new Pico Oscilloscope data has been saved email the data to General Motors Technical Assistance Center in the subject line include “Vibration” “Business Associate Code” and the last 8 of the Vehicle Identification Number.
PIP4902J2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. 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.
PIC62572017-08-15. Service bulletin. SERVICE BRAKES, HYDRAULIC. This Preliminary information communicates that the rear virtual bumper may apply the brakes in reverse in temps under 10 C with no objects arround. Engineering is investigating.
GCUS-3-8482017-08-15. Service bulletin. EQUIPMENT:ELECTRICAL. 44180 02 - Customer Satisfaction. Certain vehicles may have key codes which were inappropriately handled by a third party which could increase the risk of vehicle theft. Dealers are to replace all applicable keys and lock cylinders with new key configurations.
GCUS-3-8402017-08-15. Service bulletin. STEERING. 16189-01 - Service Update (Service Procedure Revised). Certain vehicles may have an electronic steering column lock ESCL) module installed that does not require the component. If the ESCL is not removed, the lock bolt can potentially move out of its position and lock the column. Inspect and, if present, remove the ESCL module.
GCUS-3-8322017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. 16078 -Service Update Bulletin. The light output of the forward Park/Position lamps is above design intent. The software in the Park/Position lamp?s electronic control unit was programmed incorrectly, leading to the Park/Position lamp?s electronic control unit to misinterpret the signals from the vehicle?s body control module. This results in higher-than-expected light output. Install right and left side in-line headlamp jumper harnesses.
PIC6123B2017-08-15. Service bulletin. EQUIPMENT:ELECTRICAL; LANE DEPARTURE: ASSIST; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. This Preliminary Information communication provides information to the technician for the adaptive cruise control or lane keep assist unavailable message in the driver's information center after the vehicle has been parked in direct sunlight and high ambient temperatures. The cameras electronic control unit's internal operating temperature range is -40 degrees Celsius to 85 degrees Celsius. If the temperature of the electronic control unit of the camera module exceeds 85 degrees Celsius the image processor will no longer function resulting in adaptive cruise control and lane keep assist to be unavailable until the temperature falls to below the maximum operating temperature range
PIT4733K2017-08-15. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This Preliminary Information communication provides information to the technician that customers may inquire as to the availability of OnStar bluetooth on their vehicle. Technician should be advised that Vehicles with Regular Production Option Code (UPF or UWE) offer Bluetooth through the OnStar system.

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