# Service bulletins for the 2021 Cadillac CT5 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. 800 bulletins from NHTSA, as of 2026-10-19. - [PIT5698F](/bulletins/11037555.md), 2026-09-30, Service bulletin: UNKNOWN OR OTHER. This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it. - [PIC6555A](/bulletins/11037319.md), 2026-09-16, Service bulletin: UNKNOWN OR OTHER. This PI advises of a procedure for a Service Door Latch System message with No Related DTCs - [PIP4902W](/bulletins/11037253.md), 2026-09-10, Service bulletin: UNKNOWN OR OTHER. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance. - [PIC6551C](/bulletins/11036392.md), 2026-08-27, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues - [PIT5099J](/bulletins/11035340.md), 2026-07-29, Service bulletin: UNKNOWN OR OTHER. PI to help diagnose A/C concern - [PIT5966F](/bulletins/11034769.md), 2026-07-07, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and how to reset/clear the message. - [PIC6423A](/bulletins/11032764.md), 2026-05-19, Service bulletin: UNKNOWN OR OTHER. Pi created to provide GM dealers with information on gathering information for projection issue - [PIC6551B](/bulletins/11032763.md), 2026-05-19, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues - [PIT6511](/bulletins/11031948.md), 2026-05-02, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates an issue with a replace or low FOB battery message - [PIT6507](/bulletins/11031717.md), 2026-04-29, Service bulletin: UNKNOWN OR OTHER. This PI communicates information on a SPS programming issue causing Serial Data Authentication Configuration to fail. - [PIT3271Q](/bulletins/11030974.md), 2026-04-07, Service bulletin: UNKNOWN OR OTHER. This preliminary information communicates information about how to determine if a wheel and tires size change is available. - [PIP6104](/bulletins/11030092.md), 2026-03-17, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect. - [PIP4902V](/bulletins/11030091.md), 2026-03-17, Service bulletin: UNKNOWN OR OTHER. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance. - [PIT6425D](/bulletins/11029950.md), 2026-03-11, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC'ss - [PIP5841H](/bulletins/11028658.md), 2026-02-09, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set. - [PIT5985K](/bulletins/11027932.md), 2026-02-01, Service bulletin: UNKNOWN OR OTHER. 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. - [PIP6098](/bulletins/11027701.md), 2026-01-19, Service bulletin: UNKNOWN OR OTHER. This PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered vehicles and advises of warranty direction. - [PIT6425C](/bulletins/11027697.md), 2026-01-19, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC's - [PIP5841G](/bulletins/11027617.md), 2026-01-14, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set. - [PIT6369B](/bulletins/11027615.md), 2026-01-14, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates to dealership technicians to perform the reset for the 2 modules noted above. - [PIP4902U](/bulletins/11027601.md), 2026-01-13, Service bulletin: UNKNOWN OR OTHER. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance. - [PIP6093](/bulletins/11026720.md), 2025-12-22, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set. - [25\-NA\-156](/bulletins/11026104.md), 2025-12-04, Service bulletin: WHEELS. This service bulletin provides information on Tire Sidewall Irregularities. - [00\-06\-01\-026R](/bulletins/11026017.md), 2025-12-03, Service bulletin: ENGINE. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage. - [PIT5214G](/bulletins/11025755.md), 2025-11-28, Service bulletin: UNKNOWN OR OTHER. This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit vibration conditions without utilizing the support of General Motors Technical Assistance Center. If valid vibration frequency or Road Force Variation data has been collected and a repair attempt does not correct the customer complaint, contact General Motors Technical Assistance Center for further support. For any vehicles that remains unrepaired after being at the dealer for three days or more and a related bulletin or PI is not found, contact General Motors Technical Assistance Center for further support. 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