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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.

By type

By component

By trouble code

By topic

Bulletins, newest first
PIP56012018-11-13. Service bulletin. EQUIPMENT. This Preliminary information communicates
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.
PIT5099D2018-11-13. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIC6180A2018-11-13. Service bulletin. SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER; SEATS. This Preliminary Information communication provides information to the technician with diagnostic tips for auto heated and ventilated seat operation. The auto thermal seats function activates seat heating or ventilation based on outside air temperature and the cabin air temperature control error. The cabin air temperature control error is the difference between cabin air target temperature and actual cabin air temperature.
PIP5486F2018-11-13. Service bulletin. ENGINE. This Preliminary information communicates possible concerns and a diagnostic strategy to locate and repair various noises within the engine as well as some misfire causes.
PIP5534A2018-11-13. Service bulletin. ENGINE. This Preliminary information communicates additional diagnostics to assist the dealer technician with diagnosing and repairing trouble code P2097.
PIP55972018-11-13. Service bulletin. ENGINE; EQUIPMENT:OTHER:LABELS. This Preliminary information communicates to the technician where to find the engine identification tag and what information on that tag to use during programming of someengine control modules.
PIP55962018-11-13. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS; FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP. This Preliminary information communicates that when removing the fuel line jumper hose care should be taken to be sure the line is reinstalled correctly to avoid a no/low fuel pressure situation.
PIC6307N2018-11-13. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. This Preliminary information communicates a parts restriction for the Super Cruse components.
181992018-11-13. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. 18199 - Service Update - Software that controls the electric motor for the auxiliary transmission fluid pump has a fault in the logic used for restarting the pump. During a pump restart attempt, motor current over threshold can occur resulting in DTC P0C28 (Auxiliary Transmission Fluid Pump High Current). Additionally, DTC P0B07 (Auxiliary Transmission Fluid Pump Motor Phase W Low Current) was incorrectly calibrated off. A Phase W Low Current fault will result in a vehicle shutdown or no-start condition with no DTC stored and no MIL illuminated.
PIC6137E2018-10-15. 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.
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.
PIP5545A2018-10-15. Service bulletin. EQUIPMENT. This Preliminary information communicates a possible noise from the water pump causing a DTC and the diagnostics for the repair.
182392018-10-09. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. 18239 - Emissions Recall - General Motors has decided to conduct a Voluntary Emission Recall involving certain 2018 model year vehicles, equipped with 4-cylinder engines (RPO LHN, LEX, L3A, LYX, LKN, LE2, LCV or LTG). On some vehicles, an electrical connection in the circuit board may fail in the engine control module. If this occurs, a malfunction indicator lamp (MIL), such as the Check Engine Light may illuminate. Replace the Engine Control Module (ECM).
PIP4902K2018-09-17. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; 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.
PIC6307M2018-09-17. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This Preliminary information communicates a parts restriction for the Super Cruse components.
PIP5486D2018-09-17. Service bulletin. ENGINE. This Preliminary information communicates possible concerns and a diagnostic strategy to locate and repair various noises within the engine as well as some misfire causes.
PIP5493G2018-09-17. Service bulletin. ENGINE. This Preliminary information communicates diagnostic tips for misfires on active fuel management cylinders and engineering investigations into cylinder 6 misfire on XT5 and cylinder 4 misfire on LaCrosse both of which are 2017. Changes to Preliminary informationinclude adding MY2018, advising of calibration for previous investigation and adding pictures to identify concern. Also defining calibration update information.
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.
PIP5163D2018-09-17. Service bulletin. ENGINE. This Preliminary Information communication provides information to the technician about engine block of possible cylinder bore damage, scoring or out of round as the possible cause of engine oil consumption, misfire, cylinder leakage or blow by. Technician will need to inspect the engine for Cylinder damage or scoring, An out of round cylinder bore, Dirt intrusion, and Catalytic Converter failure.
182062018-09-17. Service bulletin. EQUIPMENT. 18206 - Customer Satisfaction Program. Some vehicles may have an owner's manual that does not show the correct fuse information for the rear compartment fuse block. The label on the rear electrical center fuse block in the vehicle is correct, and does not need to be changed. Customers will receive an owner's manual insert. Dealers are to print and install owner's manual inserts.
182062018-09-10. Service bulletin. EQUIPMENT. 18206 - Customer Satisfaction Program. Some vehicles may have an owner?s manual that does not show the correct fuse information for the rear compartment fuse block. The label on the rear electrical center fuse block in the vehicle is correct, and does not need to be changed. Customers will receive an owner?s manual insert. Dealers are to print and install owner?s manual inserts.
PIP5568B2018-08-20. Service bulletin. EQUIPMENT. This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024).
PIP5402D2018-08-20. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary Information communication provides the technician with the diagnosis and repair steps for a vehicle with a check engine light on with Diagnostic Trouble Code P015B or a reduced engine power message with Diagnostic Trouble Code P1101. Technician should look for a missing or damaged O-ring seal in the charge air cooler coupler.

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