Cadillac Lyriq Service Bulletins (2026)

166 manufacturer communications on file.

• January 28, 2026•Document ID: 11027935

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6639

  Date Added:

  February 1, 2026

  Manufacturer:

  CADILLAC

  Summary

  This PI details a possible issue with the heads up display being inop, due to a possible software anomaly.

  Associated Products (2)

  2026 Cadillac Lyriq2026 Cadillac Vistiq
  Associated Documents

  • DownloadMC-11027935-0001.pdf↗
• January 28, 2026•Document ID: 11027946

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6638

  Date Added:

  February 1, 2026

  Manufacturer:

  GMC

  Summary

  This Preliminary information communicates to the technician the repair direction needed to address an inaccurate speed limit sign displayed on instrument cluster.

  Associated Products (15)

  2026 Cadillac Celestiq2026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Chevrolet Equinox2026 Chevrolet Silverado2026 Chevrolet Traverse2026 GMC Acadia2026 GMC Hummer EV Pickup2026 GMC Hummer EV SUV2026 GMC Sierra2026 GMC Yukon
  Associated Documents

  • DownloadMC-11027946-0001.pdf↗
• January 28, 2026•Document ID: 11027938

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP6099A

  Date Added:

  February 1, 2026

  Manufacturer:

  CADILLAC

  Summary

  This P/I is advising that the TCM should not be replaced for DTC P16F4 and to follow the repair instructions.

  Associated Products (19)

  2026 Buick Enclave2026 Buick Envision2026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Chevrolet Blazer2026 Chevrolet BrightDrop2026 Chevrolet Equinox2026 Chevrolet Tahoe2026 Chevrolet Traverse2026 GMC Acadia2026 GMC Sierra2026 GMC Terrain2026 GMC Yukon2026 GMC Yukon XL
  Associated Documents

  • DownloadMC-11027938-0001.pdf↗
• January 28, 2026•Document ID: 11027936

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6478

  Date Added:

  February 1, 2026

  Manufacturer:

  BUICK

  Summary

  This Preliminary information communicates to the field about a normal condition about a message that appears when using a NFC card to start the vehicle when a key fob or a digital key device is not present.

  Associated Products (14)

  2026 Buick Enclave2026 Cadillac Celestiq2026 Cadillac Escalade ESV2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Chevrolet Silverado2026 Chevrolet Tahoe2026 Chevrolet Traverse2026 GMC Acadia2026 GMC Sierra2026 GMC Yukon2026 GMC Yukon XL2025 Cadillac Lyriq
  Associated Documents

  • DownloadMC-11027936-0001.pdf↗
• January 27, 2026•Document ID: 11027825

  Service Campaign
  UNKNOWN OR OTHER

  Mfr Comm. #:

  N252494250-01

  Date Added:

  January 27, 2026

  Manufacturer:

  CADILLAC

  Summary

  Certain vehicles listed above may be missing relevant information regarding the use of snow chains, snow socks, or other traction devices from the Owner’s Manual. Vehicle owners will be mailed an owner’s manual insert to include with other important printed material in the glovebox. For vehicles currently on dealer lots, dealers will include the insert prior to delivery.

  Associated Products (17)

  2026 Cadillac Lyriq2026 Chevrolet Trailblazer2025 Cadillac Escalade IQ2025 Cadillac Lyriq2025 Cadillac Optiq2025 Chevrolet Blazer2025 Chevrolet Equinox2025 Chevrolet Suburban2025 Chevrolet Tahoe2025 Chevrolet Trailblazer2025 GMC Yukon2025 GMC Yukon XL2024 Cadillac Lyriq2024 Chevrolet Blazer2024 Chevrolet Equinox2024 Chevrolet Trailblazer2023 Cadillac Lyriq
  Associated Documents

  • DownloadMC-11027825-0001.pdf↗
• January 26, 2026•Document ID: 11027931

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6511C

  Date Added:

  February 1, 2026

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates that a front license plate frame may cause interference with the park assist sensors.

  Associated Products (10)

  2026 Cadillac Lyriq2026 Chevrolet Traverse2026 GMC Acadia2025 Cadillac Lyriq2025 Chevrolet Traverse2025 GMC Acadia2024 Cadillac Lyriq2024 Chevrolet Traverse2024 GMC Acadia2023 Cadillac Lyriq
  Associated Documents

  • DownloadMC-11027931-0001.pdf↗
• January 20, 2026•Document ID: 11027888

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP6099

  Date Added:

  January 30, 2026

  Manufacturer:

  BUICK

  Summary

  This P/I is advising that the TCM should not be replaced for DTC P16F4 and to request FSE assistance for a TCM data pull.

  Associated Products (19)

  2026 Buick Enclave2026 Buick Envision2026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Chevrolet Blazer2026 Chevrolet BrightDrop2026 Chevrolet Equinox2026 Chevrolet Silverado2026 Chevrolet Suburban2026 Chevrolet Tahoe2026 Chevrolet Traverse2026 GMC Acadia2026 GMC Sierra2026 GMC Terrain2026 GMC Yukon2026 GMC Yukon XL
  Associated Documents

  • DownloadMC-11027888-0001.pdf↗
• January 20, 2026•Document ID: 11027877

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6456A

  Date Added:

  January 30, 2026

  Manufacturer:

  CHEVROLET

  Summary

  This preliminary information communicates an issue with the key fob buttons inoperative and how to resync the fobs back to the vehicle.

  Associated Products (50)

  2026 Buick Enclave2026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Chevrolet Corvette2026 Chevrolet Equinox2026 Chevrolet Silverado2026 Chevrolet Suburban2026 Chevrolet Tahoe2026 Chevrolet Traverse2026 GMC Sierra2026 GMC Yukon2026 GMC Yukon XL2025 Buick Enclave2025 Cadillac Escalade2025 Cadillac Escalade ESV2025 Cadillac Lyriq2025 Cadillac Optiq+ 30 more
  Associated Documents

  • DownloadMC-11027877-0001.pdf↗
• January 16, 2026•Document ID: 11027911

  Over The Air
  UNKNOWN OR OTHER

  Mfr Comm. #:

  654.50

  Date Added:

  February 1, 2026

  Manufacturer:

  CADILLAC

  Summary

  • Fixes for active cabin ventilation. • Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Improvements to the performance of electric vehicle sound enhancement. • Fixes to help prevent loss of functionality for Dolby Atmos. • Fixes to ensure proper audio options display in menu. •Fixes to help ensure accurate driver display messages and alerts.

  Associated Products (1)

  2026 Cadillac Lyriq
  Associated Documents

  • DownloadMC-11027911-0001.pdf↗
• January 16, 2026•Document ID: 11027908

  Over The Air
  UNKNOWN OR OTHER

  Mfr Comm. #:

  654.30

  Date Added:

  February 1, 2026

  Manufacturer:

  CADILLAC

  Summary

  •Improvements to help protect battery health in low temperatures. •Improvements to diagnostics to reduce service messages. •Fixes to help protect battery health in high temperatures. •Fixes to improve responsiveness for vehicle diagnostics.

  Associated Products (1)

  2026 Cadillac Lyriq
  Associated Documents

  • DownloadMC-11027908-0001.pdf↗
• January 16, 2026•Document ID: 11027697

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6425C

  Date Added:

  January 19, 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's

  Associated Products (325)

  2027 Chevrolet Bolt EV2026 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 Blazer+ 305 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 (279)

  2027 Chevrolet Bolt EV2026 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 Blazer+ 259 more
  Associated Documents

  • DownloadMC-11027701-0001.pdf↗
• January 12, 2026•Document ID: 11027686

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6457B

  Date Added:

  January 19, 2026

  Manufacturer:

  BUICK

  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 (152)

  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 BrightDrop+ 132 more
  Associated Documents

  • DownloadMC-11027686-0001.pdf↗
• January 10, 2026•Document ID: 11027614

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6566B

  Date Added:

  January 14, 2026

  Manufacturer:

  BUICK

  Summary

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

  Associated Products (32)

  2026 Buick Encore GX2026 Cadillac CT42026 Cadillac Lyriq2026 Chevrolet Blazer2026 Chevrolet Colorado2026 Chevrolet Silverado2026 GMC Canyon2026 GMC Sierra2025 Buick Encore GX2025 Cadillac CT42025 Cadillac Lyriq2025 Cadillac XT42025 Chevrolet Blazer2025 Chevrolet BrightDrop2025 Chevrolet Colorado2025 Chevrolet Silverado2025 GMC Canyon2025 GMC Sierra2024 BrightDrop Zevo2024 Buick Encore GX+ 12 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:

  CHEVROLET

  Summary

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

  Associated Products (735)

  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 BrightDrop+ 715 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 (152)

  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 BrightDrop+ 132 more
  Associated Documents

  • DownloadMC-11026923-0001.pdf↗
• December 19, 2025•Document ID: 11026854

  Over The Air
  UNKNOWN OR OTHER

  Mfr Comm. #:

  654.20

  Date Added:

  December 25, 2025

  Manufacturer:

  CADILLAC

  Summary

  •This update will allow you to enable digital key with the myCadillac mobile app. •Digital key is a new feature that lets you lock, unlock, and start your vehicle using your smartphone or smartwatch. This feature allows for convenient vehicle access without a key fob. •For more information, refer to the Cadillac support site. •Digital key requires a compatible device and active OnStar service plan. See onstar.com for details and limitations. •Fixes for active cabin ventilation. •Fixes to help ensure your vehicle can recognize the key when using digital key. •Improvements to the performance of vehicle software updates. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior when an update package is onboard the vehicle. Do not service your vehicle during installation.

  Associated Products (1)

  2026 Cadillac Lyriq
  Associated Documents

  • DownloadMC-11026854-0001.pdf↗
• December 19, 2025•Document ID: 11026727

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6445B

  Date Added:

  December 22, 2025

  Manufacturer:

  CHEVROLET

  Summary

  This PI communicates information that the Collision / Detection Systems will revert to default setting of Alert and Brake after an Ignition Cycle due to an Engineering change.

  Associated Products (24)

  2026 Buick Enclave2026 Cadillac Escalade2026 Cadillac Escalade ESV2026 Cadillac Escalade IQ2026 Cadillac Escalade IQL2026 Cadillac Lyriq2026 Cadillac Optiq2026 Cadillac Vistiq2026 Cadillac XT42026 Chevrolet Colorado2026 Chevrolet Corvette2026 Chevrolet Equinox2026 Chevrolet Silverado2026 Chevrolet Suburban2026 Chevrolet Tahoe2026 Chevrolet Traverse2026 GMC Acadia2026 GMC Canyon2026 GMC Hummer EV Pickup2026 GMC Hummer EV SUV+ 4 more
  Associated Documents

  • DownloadMC-11026727-0001.pdf↗
• December 15, 2025•Document ID: 11026712

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6578D

  Date Added:

  December 22, 2025

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary information communicates procedure to relearn window motor when it reverses when expressing up.

  Associated Products (4)

  2026 Cadillac Lyriq2025 Cadillac Lyriq2024 Cadillac Lyriq2023 Cadillac Lyriq
  Associated Documents

  • DownloadMC-11026712-0001.pdf↗
• December 15, 2025•Document ID: 11026714

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6465A

  Date Added:

  December 22, 2025

  Manufacturer:

  GMC

  Summary

  This preliminary information communicates an issue with the DRL LED strips flickering and dealer are to replace the lighting control module.

  Associated Products (7)

  2026 Cadillac Lyriq2026 Chevrolet Equinox2026 Chevrolet Suburban2026 Chevrolet Tahoe2026 GMC Terrain2026 GMC Yukon2026 GMC Yukon XL
  Associated Documents

  • DownloadMC-11026714-0001.pdf↗