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Service bulletins for the 2019 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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
PIT5551E2019-11-12. 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".
PIE05392019-10-28. Service bulletin. STEERING. This engineering informational bulletin is requesting to gather information from the field to determine a root cause for a condition of a stick-Slip Type Condition Felt in Steering Wheel at Highway Speeds. The information gathered will be used to develop a field fix.
PIE05372019-10-28. 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.
PIE0526A2019-10-28. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. This engineering informational bulletin is requesting information from the field to determine the root cause of the overhead sunglasses compartment not being able to secure back into the resting position. Engineering to develop/Validate a Field Fix.
19NA2222019-10-28. Service bulletin. STRUCTURE. This technical bulletin provides repair information to correct a customer concern of hearing an upper B-Pillar rattle noise.
17NA0732019-10-28. Service bulletin. EQUIPMENT. This warranty administration bulletin provides information regarding the field action courtesy transportation policy.
19NA2082019-10-28. Service bulletin. SERVICE BRAKES. This technical bulletin provides repair information to correct a customer concern of hearing a brake squeal Noise in cold weather conditions.
19NA2072019-10-28. 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.
19NA1952019-10-28. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Intermittent OnStar Inoperative, DTC B101D-39, Red LED and Clock Date Time Inaccurate.
19NA1892019-10-28. Service bulletin. EQUIPMENT. This technical bulletin provides repair information to correct a customer concern of Radio Displays Climate Off Message or HVAC Popup Displays Different Settings.
N1922641702019-10-21. Service bulletin. ENGINE. N192264170 - SUB - Certain 2019 model year Cadillac XT4 vehicles equipped with a 2.0L. 4-Cylinder Turbo engine do not properly clear the permanent status for EBCM DTC U0100 (loss of communications with ECM) or U0101 (loss of communications with TCM) if a service tool was used to clear these DTCs. Vehicles with the permanent status set for these DTCs could potentially fail an emissions inspection in certain jurisdictions that check the permanent status of DTCs. Dealers will reprogram the electronic brake control module (EBCM).
PIP4670H2019-10-15. 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.
PIC6048K2019-10-15. Service bulletin. ELECTRICAL SYSTEM; LANE DEPARTURE. This Preliminary Information communicates to the technician that some customers may comment on the operation of their haptic seat during a Lane Keep Assist event. Lane Keep Assist works differently than Lane Departure Warning. The Lane Keep Assist icon is solid amber, Forward Camera Module is actively commanding a torque to Electronic Power Steering. This means that the driver should also feel some feedback from the steering wheel. No Chimes or haptic in the seat. Lane Keep Assist icon is flashing amber; Forward Camera Module is actively commanding torque to Electronic Power Steering. This will also be accompanied with Lane Departure Warning chimes and haptic in the seat feedback based on the setting chosen in the vehicle settings. This will take place when the vehicle has crossed lane marking by (40 cm) or (15.75 in).
PIT5630C2019-10-15. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates the possible setting of B101D-39 in the OnStar module and advises of over the air software update to resolve the concern.
PIP56752019-10-15. 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.
PIT5551E2019-10-15. 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".
PIT5481E2019-10-15. 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.
PIP56732019-10-15. 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.
PI0592E2019-09-23. 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).
130089008B2019-09-23. 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.
090604026R2019-09-23. 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.
080730026F2019-09-23. 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.
070601016F2019-09-23. Service bulletin. ENGINE AND ENGINE COOLING. This informational bulletin provides information on Internal Engine Noise or Damage After Oil Filter Replacement.
000601026M2019-09-23. Service bulletin. ENGINE AND ENGINE COOLING. This informational bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
19NA1892019-09-23. Service bulletin. EQUIPMENT. This technical bulletin provides repair information to correct a customer concern of Radio Displays Climate Off Message or HVAC Popup Displays Different Settings.

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