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Service bulletins for the 2020 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.

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

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By component

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

Bulletins, newest first
N1922870202020-11-30. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). Service Update - Certain 2019-2020 model year Cadillac CT6 vehicles equipped with a 10 speed transmission, (RPO MHS or MHW) may have a condition when shifting into park, resulting in a momentary loss of park engagement. If this were to occur, one or more of the following DTC codes P0606, P06AF or P07E4 may set and illuminate the check engine light. Dealers will reprogram the ECM.
20NA1962020-11-30. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides information and a service procedure for dealers/technicians on OnStar Over the Air Update for TTY / TDD Operation and Continuous Improvement Changes.
PIC64192020-11-16. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates there is an issue in the latest map version causing Super Cruise disengagements.
20NA1712020-10-26. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. This technical bulletin provides repair information to correct a customer concern of software issues with Radio Software Version V808.
20NA1572020-10-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
20NA1552020-10-26. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. This technical bulletin provides repair information to correct a customer concern of Service Engine Soon Message at Start Up or Shortly after Start Up.
PIP57542020-10-19. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates to the dealer an issue where diagnostic trouble code P262B may set in the engine control module due to a software concern. The dealer has been advised to clear the dtc and release the vehicle as the issue is under investigation.
PIC6410A2020-10-19. Service bulletin. ELECTRICAL SYSTEM. This preliminary information describes a condition where movies will no longer play on the radio display after a software update. This PI gives them the option of returning to the previuos version as long as they are willing to accept that they may have issues with the concerns that were fixed with the updated software until a repair is released
20NA1712020-09-28. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. This technical bulletin provides repair information to correct a customer concern of software issues with Radio Software Version V808.
20NA1572020-09-28. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
PIC6410A2020-09-14. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT:VIDEO (TOUCH)SCREEN/MONITOR/UNIT; ELECTRICAL SYSTEM. This preliminary information describes a condition where movies will no longer play on the radio display after a software update. This PI gives them the option of returning to the previuos version as long as they are willing to accept that they may have issues with the concerns that were fixed with the updated software until a repair is released
PIC6265E2020-08-10. Service bulletin. LANE DEPARTURE: ASSIST; ELECTRICAL SYSTEM; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. 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".
PIP5095G2020-08-10. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. 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.
PIT57452020-08-10. Service bulletin. ELECTRICAL SYSTEM; SEATS. This Preliminary information communicates and issue with the memory seat module waking up the low speed GM lan bus and causing a battery draw.
20NA1322020-08-10. Service bulletin. ELECTRICAL SYSTEM. This warranty administration bulletin provides policy information on the requirements for battery testing and warranty replacements.
070849020Q2020-06-22. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information for the IPC odometer programming method quick reference guide.
070604025M2020-06-22. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information on Clicking/Ticking Sound/Noise Heard During Cold Start and that this should be considered a normal characteristic.
060089029T2020-06-22. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. This informational bulletin includes information on Interior Cleaning - Instrument Panel (IP), Hard or Plastic Surfaces, Seats, Carpet, Leather, Vinyl, Fabric Cleaner, Stain Remover, Restorer - Product Availability.
060089029S2020-06-22. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. This informational bulletin includes information on Interior Cleaning - Instrument Panel (IP), Hard or Plastic Surfaces, Seats, Carpet, Leather, Vinyl, Fabric Cleaner, Stain Remover, Restorer - Product Availability.
20NA1092020-06-22. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides a procedure to correct a condition of an MIL Illuminated w/DTC P0128.
20NA0992020-06-22. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Park Assist Not Available to Turn On or Off and Possible Driver Information Center (DIC) Illuminated with DTC U0159 Set.
19NA2692020-06-22. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. This Technical bulletin provides a service procedure for dealers/technicians on installation of Radio Software Version U148 Over-the-Air Update.
20NA0732020-05-26. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Loss of Brake Assist, Various Messages Displayed in DIC, Brake Pedal Travel and Apply May Feel Different, DTC C0024 Set.
19NA0762020-05-26. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Blue Screen and Service Rear Vision System Message on Radio Display.
18NA1802020-05-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This Warranty Administration Bulletin Provides High Voltage Battery Exchange Process Information.

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