Cadillac CT4 Service Bulletins (2023)

547 manufacturer communications on file.

• March 9, 2026•Document ID: 11030091

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP4902V

  Date Added:

  March 17, 2026

  Manufacturer:

  BUICK

  Summary

  This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

  Associated Products (210)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 190 more
  Associated Documents

  • DownloadMC-11030091-0001.pdf↗
• March 2, 2026•Document ID: 11029950

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6425D

  Date Added:

  March 11, 2026

  Manufacturer:

  BUICK

  Summary

  This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC'ss

  Associated Products (210)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 190 more
  Associated Documents

  • DownloadMC-11029950-0001.pdf↗
• February 12, 2026•Document ID: 11028859

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5865L

  Date Added:

  February 18, 2026

  Manufacturer:

  GMC

  Summary

  This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.

  Associated Products (14)

  2026 Cadillac CT42026 Chevrolet Colorado2026 GMC Canyon2025 Cadillac CT42025 Chevrolet Colorado2025 GMC Canyon2024 Cadillac CT42024 Chevrolet Colorado2024 GMC Canyon2023 Cadillac CT42023 Chevrolet Colorado2023 GMC Canyon2022 Cadillac CT42021 Cadillac CT4
  Associated Documents

  • DownloadMC-11028859-0001.pdf↗
• February 12, 2026•Document ID: 11028856

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5841J

  Date Added:

  February 18, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set.

  Associated Products (22)

  2025 Buick Envision2025 Cadillac CT42025 Cadillac CT52025 Cadillac XT42025 Cadillac XT52025 Cadillac XT62025 Chevrolet Blazer2024 Buick Envision2024 Cadillac CT42024 Cadillac CT52024 Cadillac XT42024 Cadillac XT52024 Cadillac XT62024 Chevrolet Blazer2023 Buick Envision2023 Cadillac CT42023 Cadillac CT52023 Cadillac XT42023 Cadillac XT52023 Cadillac XT6+ 2 more
  Associated Documents

  • DownloadMC-11028856-0001.pdf↗
• February 4, 2026•Document ID: 11028658

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5841H

  Date Added:

  February 9, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set.

  Associated Products (38)

  2025 Buick Envision2025 Cadillac CT42025 Cadillac CT52025 Cadillac XT42025 Cadillac XT52025 Cadillac XT62025 Chevrolet Blazer2024 Buick Envision2024 Cadillac CT42024 Cadillac CT52024 Cadillac XT42024 Cadillac XT52024 Cadillac XT62024 Chevrolet Blazer2023 Buick Envision2023 Cadillac CT42023 Cadillac CT52023 Cadillac XT42023 Cadillac XT52023 Cadillac XT6+ 18 more
  Associated Documents

  • DownloadMC-11028658-0001.pdf↗
• January 30, 2026•Document ID: 11027949

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5921B

  Date Added:

  February 1, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates the possibility of DTC p0011 p0016 and potential for a rattle or ticking noise to occur from the Intake Cam Actuator, or cover plate screws backing out and making contact with Cam carrier

  Associated Products (3)

  2023 Cadillac CT42022 Cadillac CT42021 Cadillac CT4
  Associated Documents

  • DownloadMC-11027949-0001.pdf↗
• January 29, 2026•Document ID: 11027942

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5865K

  Date Added:

  February 1, 2026

  Manufacturer:

  GMC

  Summary

  This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.

  Associated Products (14)

  2026 Cadillac CT42026 Chevrolet Colorado2026 GMC Canyon2025 Cadillac CT42025 Chevrolet Colorado2025 GMC Canyon2024 Cadillac CT42024 Chevrolet Colorado2024 GMC Canyon2023 Cadillac CT42023 Chevrolet Colorado2023 GMC Canyon2022 Cadillac CT42021 Cadillac CT4
  Associated Documents

  • DownloadMC-11027942-0001.pdf↗
• January 27, 2026•Document ID: 11027932

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT5985K

  Date Added:

  February 1, 2026

  Manufacturer:

  CADILLAC

  Summary

  This PI provides diagnostics tips to dealership techs when trying to diagnose a CAN Bus communication issue after an event like a lightning strike, battery jump started backwards, failure over the air update, etc.

  Associated Products (85)

  2026 Buick Enclave2026 Buick Envision2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Chevrolet Colorado2026 Chevrolet Equinox2026 Chevrolet Tahoe2026 Chevrolet Traverse2026 GMC Acadia2026 GMC Canyon2026 GMC Hummer EV Pickup2026 GMC Hummer EV SUV2026 GMC Yukon2026 GMC Yukon XL2025 Buick Enclave2025 Buick Envision+ 65 more
  Associated Documents

  • DownloadMC-11027932-0001.pdf↗
• January 16, 2026•Document ID: 11027697

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6425C

  Date Added:

  January 19, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC's

  Associated Products (210)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 190 more
  Associated Documents

  • DownloadMC-11027697-0001.pdf↗
• January 14, 2026•Document ID: 11027701

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP6098

  Date Added:

  January 19, 2026

  Manufacturer:

  CHEVROLET

  Summary

  This PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered vehicles and advises of warranty direction.

  Associated Products (210)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 190 more
  Associated Documents

  • DownloadMC-11027701-0001.pdf↗
• January 12, 2026•Document ID: 11027689

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5700G

  Date Added:

  January 19, 2026

  Manufacturer:

  CADILLAC

  Summary

  This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering

  Associated Products (16)

  2023 Cadillac CT42023 Chevrolet Camaro2023 Chevrolet Express2023 GMC Savana2022 Cadillac CT42022 Chevrolet Camaro2022 Chevrolet Colorado2022 Chevrolet Express2022 GMC Canyon2022 GMC Savana2021 Cadillac CT42021 Chevrolet Camaro2021 Chevrolet Colorado2021 Chevrolet Express2021 GMC Canyon2021 GMC Savana
  Associated Documents

  • DownloadMC-11027689-0001.pdf↗
• January 12, 2026•Document ID: 11027686

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6457B

  Date Added:

  January 19, 2026

  Manufacturer:

  CHEVROLET

  Summary

  This preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements. They should follow the notes mentioned prior to anything being replaced.

  Associated Products (136)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 116 more
  Associated Documents

  • DownloadMC-11027686-0001.pdf↗
• January 10, 2026•Document ID: 11027617

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5841G

  Date Added:

  January 14, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set.

  Associated Products (38)

  2025 Buick Envision2025 Cadillac CT42025 Cadillac CT52025 Cadillac XT42025 Cadillac XT52025 Cadillac XT62025 Chevrolet Blazer2024 Buick Envision2024 Cadillac CT42024 Cadillac CT52024 Cadillac XT42024 Cadillac XT52024 Cadillac XT62024 Chevrolet Blazer2023 Buick Envision2023 Cadillac CT42023 Cadillac CT52023 Cadillac XT42023 Cadillac XT52023 Cadillac XT6+ 18 more
  Associated Documents

  • DownloadMC-11027617-0001.pdf↗
• January 10, 2026•Document ID: 11027615

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6369B

  Date Added:

  January 14, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates to dealership technicians to perform the reset for the 2 modules noted above.

  Associated Products (44)

  2026 Buick Encore2026 Cadillac CT42025 Buick Encore2025 Cadillac CT42025 Chevrolet Corvette2025 Chevrolet Tahoe2025 GMC Hummer EV Pickup2025 GMC Hummer EV SUV2024 Buick Encore2024 Cadillac CT42024 Cadillac CT52024 Cadillac Escalade2024 Cadillac Escalade ESV2024 Chevrolet Corvette2024 Chevrolet Tahoe2024 GMC Hummer EV Pickup2024 GMC Hummer EV SUV2024 GMC Yukon2024 GMC Yukon XL2023 Buick Encore+ 24 more
  Associated Documents

  • DownloadMC-11027615-0001.pdf↗
• January 10, 2026•Document ID: 11027614

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6566B

  Date Added:

  January 14, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates to dealership technicians to perform the reset for the 2 modules noted above.

  Associated Products (21)

  2026 Buick Encore GX2026 Cadillac CT42026 Cadillac Lyriq2026 Chevrolet Colorado2026 GMC Canyon2025 Buick Encore GX2025 Cadillac CT42025 Cadillac Lyriq2025 Cadillac XT42025 Chevrolet Colorado2025 GMC Canyon2024 Buick Encore GX2024 Cadillac CT42024 Cadillac Lyriq2024 Cadillac XT42024 Chevrolet Colorado2024 GMC Canyon2023 Buick Encore GX2023 Cadillac CT42023 Chevrolet Colorado+ 1 more
  Associated Documents

  • DownloadMC-11027614-0001.pdf↗
• January 8, 2026•Document ID: 11027601

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP4902U

  Date Added:

  January 13, 2026

  Manufacturer:

  GMC

  Summary

  This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

  Associated Products (210)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 190 more
  Associated Documents

  • DownloadMC-11027601-0001.pdf↗
• December 31, 2025•Document ID: 11026923

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6540F

  Date Added:

  January 4, 2026

  Manufacturer:

  CHEVROLET

  Summary

  This Preliminary information communicates to dealers a procedure to reset the radio.

  Associated Products (136)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 116 more
  Associated Documents

  • DownloadMC-11026923-0001.pdf↗
• December 17, 2025•Document ID: 11026721

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP6092A

  Date Added:

  December 22, 2025

  Manufacturer:

  CADILLAC

  Summary

  This preliminary information advises dealers that Engine Control Module designation E01 is on a ordering restriction through technical assistance.

  Associated Products (23)

  2026 Cadillac CT42026 Cadillac CT52026 Chevrolet Colorado2026 GMC Canyon2025 Buick Envision2025 Cadillac CT42025 Cadillac CT52025 Cadillac XT42025 Chevrolet Colorado2025 GMC Canyon2024 Buick Envision2024 Cadillac CT42024 Cadillac CT52024 Cadillac XT42024 Chevrolet Colorado2024 GMC Canyon2023 Buick Envision2023 Cadillac CT42023 Cadillac CT52023 Chevrolet Colorado+ 3 more
  Associated Documents

  • DownloadMC-11026721-0001.pdf↗
• December 12, 2025•Document ID: 11026600

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6457A

  Date Added:

  December 15, 2025

  Manufacturer:

  GMC

  Summary

  This preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements. They should follow the notes mentioned prior to anything being replaced.

  Associated Products (136)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 116 more
  Associated Documents

  • DownloadMC-11026600-0001.pdf↗
• November 25, 2025•Document ID: 11026062

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6457

  Date Added:

  December 3, 2025

  Manufacturer:

  CADILLAC

  Summary

  This preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements. They should follow the notes mentioned prior to anything being replaced.

  Associated Products (136)

  2026 Buick Enclave2026 Buick Encore2026 Buick Encore GX2026 Buick Envision2026 Buick Envista2026 Cadillac Celestiq2026 Cadillac CT42026 Cadillac CT52026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Cadillac XT52026 Cadillac XT62026 Chevrolet Blazer2026 Chevrolet Colorado+ 116 more
  Associated Documents

  • DownloadMC-11026062-0001.pdf↗