2026 Cadillac CT4 TSBs
90 Technical Service Bulletins across 12 categories
Categories
Other
25 bulletinsThis preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements.
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They should follow the notes mentioned prior to anything being replaced.
This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
This Preliminary information communicates to the technicians a diagnostic tip if a technician loses communication with...
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the image processor #2 and how to restore communication
This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues
This PI states that if SDGM DTC U3000 Sym 49 is set and no other SDGM DTCs are present, clear DTCs and reset the SDGM.
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Advises of how to contact PQC to authorize SDGM replacement.
Pi created to provide GM dealers with information on gathering information for projection issue
This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues
This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical...
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Assistance Case in CX Connect.
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
This preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements.
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They should follow the notes mentioned prior to anything being replaced.
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
This preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements.
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They should follow the notes mentioned prior to anything being replaced.
This preliminary information is for technicians that may see DTCs that are history and should not perform any part replacements.
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They should follow the notes mentioned prior to anything being replaced.
New Vehicle Monitoring Programs Section in IVH
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
This Preliminary information communicates an issue with super cruise unavailable due to the driver's monitoring camera...
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and dealers to replace the camera.
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini...
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50 terminal test probe, replacement terminals, and terminated leads.
This PI communicates the requirement to provide a pico file to receive diagnostic assistance from TAC.
This Preliminary information communicates a diagnostic tip on how to resolve a issue if the serial data authentication...
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configuration did not complete correctly.
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini...
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50 terminal test probe, replacement terminals, and terminated leads.
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini...
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50 terminal test probe, replacement terminals, and terminated leads.
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini...
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50 terminal test probe, replacement terminals, and terminated leads.
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini...
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50 terminal test probe, replacement terminals, and terminated leads.
Engine
17 bulletinsThis Preliminary information communicates an issue with the SES MIL and DTC P062B and engineering is currently...
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investigating.
This Preliminary information communicates an issue with the SES MIL and DTC P062B and engineering is currently...
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investigating.
This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on...
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part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.
This preliminary information is to inform technicians and customers that the voice command will be inoperative when trying to open applications.
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Engineering is investigating and this PI will be converted to a bulletin when a repair is available.
The document advise technicians after an engine repair involving removal of the camshaft actuators, the vehicle may set...
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p1101 P0172 and or stalls when taken off idle. The technician is instructed to verify the intake and exhaust camshaft actuators are installed onto the correct camshafts.
The document makes technicians aware of a valvetrain tick noise that is created by one or more soft hydraulic valve lash adjusters.
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The soft lash adjuster concern is due to debris from the valve rocker arm, entering into the lash adjuster. The document instructs the technician to replace all of the lash adjusters and rocker arms in the entire engine if any soft lash adjusters are found.
This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on...
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part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.
The document makes technicians aware of a valvetrain tick noise that is created by one or more soft hydraulic valve lash adjusters.
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The soft lash adjuster concern is due to debris from the valve rocker arm, entering into the lash adjuster. The document instructs the technician to replace all of the lash adjusters and rocker arms in the entire engine if any soft lash adjusters are found.
This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the...
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possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.
This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the...
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possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.
This preliminary information advises dealers that Engine Control Module designation E01 is on a ordering restriction...
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through technical assistance.
This bulletin communicates to the dealer a temporary solution to prevent a dead battery until engineering can provide a...
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permanent solution.
This Preliminary Information communication provides information to the technician about vehicles that have had multiple...
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repair attempts that are being performed on customers 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.
This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the...
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possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.
This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the...
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possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.
Certain vehicles listed above, may have a condition in which the torque on the engine thermostat housing fasteners is low.
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Dealers will inspect for engine cooling system leaks originating at the thermostat housing. If a leak is present the thermostat housing gasket and seal will be replaced, fasteners secured to correct torque and coolant system refilled. If leak does not exist, torque fasteners to the 10Nm.
This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the...
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possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.
Electrical
15 bulletinsThis Preliminary information communicates to dealership technicians that if they encounter a customer vehicle with this...
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concern, to perform the steps listed and should be able to reprogram the module and correct this.
This Preliminary information communicates to dealership technicians to perform the reset for the 2 modules noted above.
This Preliminary information communicates an issue with a replace or low FOB battery message
This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no...
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DTC'ss
This PI provides diagnostics tips to dealership techs when trying to diagnose a CAN Bus communication issue after an...
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event like a lightning strike, battery jump started backwards, failure over the air update, etc.
This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no...
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DTC's
This Preliminary information communicates to dealership technicians to perform the reset for the 2 modules noted above.
This Preliminary information communicates to dealership technicians to perform the reset for the 2 modules noted above.
This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no...
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DTC's
This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no...
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DTC's
The Driver Information Center may display a message of Transport Mode On after the ignition is cycled.
This Preliminary information communicates not to replace the Image processing Module if the following DTC's are history...
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- U3000 SYM49, U1624, U0140, U023B SYM00, U053C, B1DD SYM57.
This Preliminary information communicates not to replace the Image processing Module if the following DTC's are history...
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- U3000 SYM49, U1624, U0140, U023B SYM00, U053C, B1DD SYM57.
This Preliminary Information communication provides information to the technician about vehicles that have an...
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intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble Codes B3055, B3060, B3935, C0750, C0755, C0760, C0765, and/or C0775.
This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use...
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for certain repairs, such as Wiring Harness Repairs.
Infotainment
13 bulletinsThis Preliminary information communicates to dealers a procedure to reset the radio.
This update contains a required software change to help improve the overall software update and diagnostics process.
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Be sure to install this update to be able to receive future software updates. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior.
Fixes to help prevent loss of audio Better connectivity for Bluetooth and CarPlay Improved performance for vehicle...
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software updates
Improvements to system responsiveness Improvements to camera image clarity Fixes to prevent blank screens and audio...
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drop-outs Improvements to vehicle software update installation
This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and...
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how to reset/clear the message.
Fixes to help prevent loss of functionality for connectivity features such as OnStar, Wi-Fi, Navigation, and Super...
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Cruise.
This Preliminary information communicates to dealers a procedure to reset the radio.
This Preliminary information communicates to dealers a procedure to reset the radio.
This Preliminary information communicates to dealers a procedure to reset the radio.
This Preliminary information communicates to dealers a procedure to reset the radio.
Fixes to help ensure responsiveness for the driver display and rear view camera.
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Improvements to reliability for alerts and chimes.
This Preliminary information communicates to dealers a procedure to reset the radio.
This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and...
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how to reset/clear the message.
Body & Paint
5 bulletinsThis PI advises of a procedure for a Service Door Latch System message with No Related DTCs
This PI Communicates information to ensure Memory Recall is enabled to ensure memory mirrors return to set position...
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after curbview assist is used.
This PI Communicates information to ensure Memory Recall is enabled to ensure memory mirrors return to set position...
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after curbview assist is used.
This PI Communicates information to ensure Memory Recall is enabled to ensure memory mirrors return to set position...
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after curbview assist is used.
This Preliminary information communicates a diagnostic tip on how to resolve a issue of the horn sounding when vehicle...
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doors are being closed and the key in vehicle reminder set to off.
Pre-Delivery & Maintenance
5 bulletinsThis service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may...
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not pass California smog inspection or smog inspection in other states.
This warranty administration bulletin provides information for dealers/technicians on System Reset and Connector...
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Reconnect Labor Code Numbers.
This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance...
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programs.
This warranty administration bulletin provides information for dealers/technicians on System Reset and Connector...
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Reconnect Labor Code Numbers.
The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for...
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causing multiple customer concerns that do not have other diagnostic methods to identify them.
Fuel System
3 bulletinsThis PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered vehicles and...
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advises of warranty direction.
This warranty administration bulletin provides policy information on vehicles outside of a California Emissions State...
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who move to and register their vehicle in a California Emission State may be entitled to the 7 year, 70,000-mile Emission Select State Component Limited Warranty.
This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for...
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analysis.
Brakes
2 bulletinsImprovements to traction and stability control on uneven terrain Improvements to braking performance on low-traction...
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surfaces Improvements to assisted braking Improvements to active cabin ventilation Additional protection for the health of your battery Updates to help prevent excessive battery drain and overheating Improvements to the software update system
This service bulletin provides information for the technicians to use a Customer Concern Verification sheet to...
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facilitate the questions needing to be answered by the customer regarding Automatic Emergency Braking (AEB) issues.
Tires & Wheels
2 bulletinsThis preliminary information communicates information about how to determine if a wheel and tires size change is...
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available.
This service bulletin provides information on Tire Sidewall Irregularities.
HVAC & Climate
1 bulletinPI to help diagnose A/C concern
Transmission
1 bulletinImproves transmission diagnostic software.
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Reduces unnecessary check
Air Bags & Safety
1 bulletinThis Preliminary information communicates assistance in locating the Rear seat belt comfort guides in the parts catalog.