Service bulletins for the 2020 Cadillac XT4
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.
758 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| PIC6374 | 2019-12-09. Service bulletin. ENGINE AND ENGINE COOLING; SERVICE BRAKES. This Preliminary information communicates to the dealer a GDS2 error message (see below) might occur when trying to deactivate the boost system when preforming the hydraulic bleed procedure. This concern could be caused by the B20 Brake Fluid Level Switch Connector and the B34D Engine Coolant Temperature Sensor 4 Connector have been swapped. |
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| 990420002K | 2019-11-25. Service bulletin. POWER TRAIN. This informational bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operations. |
| 100089009C | 2019-11-25. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This informational bulletin provides information on key code security and information on GM key code look up applications. |
| 100089006G | 2019-11-25. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This informational bulletin provides information for dealers how to submit a product information report (PIR) (Canada Only). |
| 010601011K | 2019-11-25. Service bulletin. ENGINE AND ENGINE COOLING. This informational bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption. |
| 010089010N | 2019-11-25. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This informational bulletin provides information on comebacks prevention information and using customer concern verification sheets (CCVS). |
| 18NA359 | 2019-11-25. Service bulletin. POWER TRAIN. This informational bulletin advises the tech of a possible normal condition caused when the transmission performs a 1-2 upshift at light throttle and why the D in the PRNDL will flash. |
| 18NA306 | 2019-11-25. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA) (US dealers only). |
| 18NA279 | 2019-11-25. Service bulletin. EQUIPMENT:ELECTRICAL. This informational bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking. |
| 16NA338 | 2019-11-25. Service bulletin. POWER TRAIN. This Bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns. |
| PIT5535E | 2019-11-12. Service bulletin. LANE DEPARTURE. This Preliminary Information communication provides information to the technician about vehicles that may have Service Front Camera, Service Lane Departure Warning, and Service Lane Keep Assist Message. Technician may find Diagnostic Trouble Code B1008 Sym 4B set. Technician will need to check the windshield to ensure it is not aftermarket. Technician will also check for anything that may impair the front view camera and ensure the camera is properly mounted. |
| PIT5551E | 2019-11-12. Service bulletin. FORWARD COLLISION AVOIDANCE. This Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. This is normal when the FAB has been set to "Alert". |
| PIE0537 | 2019-10-28. Service bulletin. ENGINE AND ENGINE COOLING. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a check engine lamp illuminated and DTC P0451 set. |
| 19NA222 | 2019-10-28. Service bulletin. STRUCTURE. This technical bulletin provides repair information to correct a customer concern of hearing an upper B-Pillar rattle noise. |
| 17NA073 | 2019-10-28. Service bulletin. EQUIPMENT. This warranty administration bulletin provides information regarding the field action courtesy transportation policy. |
| 19NA207 | 2019-10-28. Service bulletin. EQUIPMENT. This informational bulletin provides information to educate the customer on using either the radio and/or the physical controls to adjust the HVAC settings. |
| PIP4670H | 2019-10-15. Service bulletin. ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician about a no start or another concern after swapping an Engine Control Module or other modules from one vehicle to another. The Global Architecture electrical system associated with these vehicles does not allow controller swaps between vehicles. |
| PIP5675 | 2019-10-15. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates to the dealer that a customer may comment that the MIL light is illuminated. The technician may find P1098 and/or P26BB set current or history. That this may be caused by a software anomaly, and that GM is currently looking into the issue. It provides testing and related direction based on the results. |
| PIT5551E | 2019-10-15. Service bulletin. FORWARD COLLISION AVOIDANCE. This Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. This is normal when the FAB has been set to "Alert". |
| PIT5481E | 2019-10-15. Service bulletin. STEERING. This Preliminary Information communication provides information to the technician with additional information on the functionality of Lane Keep Assist. Starting with 2016 model year Lane Keep Assist Regular Production Option Code (UHX) replaced Lane Departure Warning Regular Production Option Code (UFL). Lane Keep Assist is designed to assist the driver in keeping the vehicle from drifting out of a driving lane that has clearly identified markings. The electric power steering provides a gentle steering correction if a lane marking has been crossed and the driver has not actively responded. |
| PIP5673 | 2019-10-15. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates advises the technician that the ECM part number will be placed on a parts restriction through the General Motors Technical Assistance Center. Dealer will need to contact General Motors Technical Assistance Center for further assistance. |
| PI0592E | 2019-09-23. Service bulletin. ELECTRICAL SYSTEM. This preliminary information bulletin provides information om Service Programming System (SPS) Error Codes E4398, E4399, E4403, M4404, M4413, E4414, E4423, E4491 or E6961). |
| 130089008B | 2019-09-23. Service bulletin. EQUIPMENT. This bulleting provides Wiring, Terminal and Connector Repair Information including how to determine the Service Part Number in eSI and how to locate the part(s) in the EPC. |
| 090604026R | 2019-09-23. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2. |
| 080730026F | 2019-09-23. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin provides information on Some vehicles may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.