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Service bulletins for the 2020 Cadillac CT4

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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
PIE0661C2022-06-04. Service bulletin. FORWARD COLLISION AVOIDANCE; ELECTRICAL SYSTEM. This engineering information (EI) closure ends the need for further information from the field in regards to a Forward Collision Icon Message Illuminated on Driver Information Center (DIC) and/or No DTCs Set.
22-NA-1072022-06-04. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION. This service bulletin provides repair information to correct a customer concern of a Service AWD Message in DIC at Ignition On with DTC C056D Set.
22-NA-1062022-06-04. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT. This service bulletin provides information on GM Canada New Vehicle Tire Warranty Program for Original Equipment (OE) Tires and PDI installed Limited Production Option (LPO) Tires.
21-NA-2752022-06-04. Service bulletin. POWER TRAIN. This service bulletin provides repair information to correct customer concerns of Rear Wheel Lock Up, ABS Event, Loud Bang and a Flashing “D” on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.
21-NA-0432022-06-02. Service bulletin. FUEL SYSTEM, GASOLINE; SERVICE BRAKES; ENGINE AND ENGINE COOLING; FUEL SYSTEM, DIESEL; WHEELS. This informational bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
18-NA-0992022-06-01. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim.
22-NA-0942022-05-31. Service bulletin. ENGINE AND ENGINE COOLING. This service bulletin provides repair information to correct a customer concern of a loss of cabin heat.
20-NA-1592022-05-31. Service bulletin. WHEELS. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
22NA0182022-05-31. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This service bulletin provides information for the Global Warranty Management (GWM) Warranty Parts Center (WPC) Part Photo Return Process (U.S. Dealers Only).
22NA0122022-05-31. Service bulletin. ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SENSORS. This service bulletin provides information for dealers/technicians on Stone Chip/Membrane Damage, Broken Connector and/or Sensor Retaining Tabs, and/or Paint Damage of Park Assist Sensors.
22NA0092022-05-31. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:FILTER/SCREEN. This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
18NA0732022-05-31. Service bulletin. ENGINE. This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and prevent unnecessary engine replacement.
18NA0672022-05-31. Service bulletin. SERVICE BRAKES. This service bulletin provides information for cleaning brake dust off of aluminum or chrome wheels.
16NA3612022-05-31. Service bulletin. AIR BAGS; POWER TRAIN. This service bulletin provides service /diagnostic information to aid with a Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle.
16NA2222022-05-31. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:FILTER/SCREEN; UNKNOWN OR OTHER. This bulletin provides information on Engine Concerns that could result from lack of scheduled maintenance, improper service or aftermarket calibrations.
N2123533902022-05-17. Service bulletin. EQUIPMENT:ELECTRICAL. Service Update Bulletin. Certain vehicles that had the Serial Data Gateway Module (SDGM) replaced in service, may not have been programmed correctly resulting in an incomplete registration of the new module. Dealers are to reprogram the SDGM.
PIC5260E2022-05-16. Service bulletin. VISIBILITY:SUN/MOON ROOF ASSEMBLY. This Preliminary Information communication advises the technician the steps on diagnosing the concern. Customer's sunroof operation intermittent, bind, noise, auto-reverse, and/or water leaks.
16-NA-0192022-05-10. Service bulletin. POWER TRAIN. This service bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
12-00-89-003B2022-05-10. Service bulletin. EQUIPMENT:ELECTRICAL; ENGINE. This service bulletin provides policy information on warranty administration guidelines for multiple repairs with independent causes (GM Canada Dealers Only).
22-NA-0702022-05-03. Service bulletin. EQUIPMENT. This service bulletin provides information for replacement parts traceability (RPT) process to aid in tracking part replacements.
01-00-89-010P2022-04-29. Service bulletin. EQUIPMENT. This informational bulletin provides information on a guide to help reduce repeat visits for the same customer concern.
PI0281I2022-04-22. Service bulletin. STRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS; STRUCTURE. This preliminary informational (PI) bulletin provides information to dealership personnel which may be helpful when addressing underbody component corrosion with customers.
PIP4670J2022-04-18. 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.
PIP5839A2022-04-18. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates the possibility of the engine running hot or overheating with no DTC's due to inaccurate coolant temperature sensor located on the coolant pump outlet pipe.
PIP5701B2022-04-18. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates that the E01 ECM p/n 12703874 is on part restriction.

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