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
| PIC6384A | 2020-04-13. Service bulletin. STRUCTURE; ELECTRICAL SYSTEM. This Preliminary information communicates a parts restriction is in place for the Body Control Module on 2020 Cadillac CT4, CT5, and Chevrolet Corvette. |
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| PIC6385A | 2020-04-13. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. This Preliminary information communicates a parts restriction is in place for the exterior lighting module on 2020 Cadillac CT4, CT5 and Chevrolet Corvette. |
| PIC6391A | 2020-04-13. Service bulletin. SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM. This PI communicates a parts restriction is in effect on 2020 Cadillac CT4, CT5 and Chevrolet Corvette Electronic Brake Boost Control Module and Valve Kit, Brake Pressure Modulator. |
| PIP5701A | 2020-04-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates that the E01 ECM p/n 12703874 is on part restriction. |
| PIC6388A | 2020-04-13. Service bulletin. LANE DEPARTURE: BLIND SPOT DETECTION; VISIBILITY. This PI communicates a parts restriction is in effect on 2020 Cadillac CT4, and CT5 Side Blind Zone Module. |
| PIC6382A | 2020-04-13. Service bulletin. ELECTRICAL SYSTEM; BACK OVER PREVENTION. This PI communicates a parts restriction is in effect on 2020 cadillac CT4, and CT5 Front View Camera Module. |
| PIC6381A | 2020-04-13. Service bulletin. ELECTRICAL SYSTEM; ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC); SUSPENSION. This Preliminary information communicates a parts restriction is in place for the Suspension Control Module on 2020 Cadillac CT4, CT5. |
| PIC6389A | 2020-04-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a parts restriction is in place for the Long Range Radar Module on 2020 Cadillac CT4 and CT5. |
| PIC6394A | 2020-04-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a parts restriction is in place for the Image Processing Module on 2020 Cadillac CT4, and CT5. |
| PIP5700B | 2020-04-13. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. This Preliminary information communicates to the dealer technician that the part numbers for the internal wiring harnesses for the 8 speed RWD transmissions are not listed in the Electronic Parts Catalog. Technicians are to refer to the information provided in this document to obtain the internal wiring harness part numbers by application. |
| PIP5712 | 2020-04-13. Service bulletin. ENGINE. This Preliminary information communicates to the technician a service Diagnostic / Repair tip to avoid causing the crankshaft sprocket to disengage from the crankshaft during crankshaft balancer removal. |
| 150089005C | 2020-04-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT ADAPTIVE/MOBILITY. This Warranty Administration bulletin provides information on Essential Tools that include Consumable Parts (U.S. Only). |
| 050307009J | 2020-04-06. Service bulletin. EQUIPMENT; WHEELS. This informational bulletin provides information on Wheel Alignment Specifications, Requirements and Recommendations for GM Vehicles. |
| 040601029J | 2020-04-06. Service bulletin. ENGINE; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin explains Unscheduled Supplemental Services (including Flushing Services and Additives) and the Proper use of GM Simplified Maintenance Schedules. |
| 040089015U | 2020-04-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides information on Warranty Administration ? Required Operating Procedures - 8 Points (U.S. Only). |
| 000310003Y | 2020-04-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; TIRES. This warranty administration bulletin provides information on the tires supplied with a new vehicle are covered by General Motors against defects in material or workmanship under the Bumper-to-Bumper New Vehicle Limited Warranty. |
| 19NA104 | 2020-04-06. Service bulletin. EQUIPMENT; STRUCTURE:BODY; EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin provides information for dealers/technicians and customers on steam/vapor coming from the front grille or radiator area. |
| 20NA045 | 2020-03-30. Service bulletin. WHEELS. This informational bulletin provides information on how to properly clean the wheel with the condition of Black Sealant Material Visible on Wheel Edge. |
| 18NA073 | 2020-03-30. Service bulletin. EQUIPMENT; ENGINE. This 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. |
| 16NA119 | 2020-03-30. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This warranty administration bulletin provide policy information to cover GMs policy on performing GM covered vehicle services and maintenance on vehicles originating/sold in Canada. |
| PIP5677C | 2020-03-09. Service bulletin. POWER TRAIN. This Preliminary information communicates to the dealer technician that the 10L60, 10L80 and the 10L90 transmissions have been place on a part restriction. Dealers are to contact the Product Quality Center before replacing the transmission assembly. |
| PIC6405 | 2020-03-09. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. This Preliminary information communicates that the OAT sensor may not read correctly upon startup after the vehicle has been parked for two hours or more. Engineering is aware of the concern and is working on a resolution. |
| PIC6404 | 2020-03-09. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; STEERING. This Preliminary information communicates An issue may occur causing a Service Driver Assist, Steering Assist Reduced Messages, or MIL illuminated with P25A2, U0265, and U0566, replacing the Front View Camera for frequently occurring cases and a software/hardware solution will be forthcoming for in frequently occurring cases. |
| PIT5411S | 2020-03-09. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; EQUIPMENT:ELECTRICAL; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This Preliminary Information communication advises the technician that the Radio or Tuner, radio controls, Integrated Center Stack, HUD's, IPC's, and radio displays are placed on restriction through the General Motors Technical Assistance Center. Dealers will need to contact General Motors Technical Assistance Center for further assistance. |
| PIP5677B | 2020-03-09. Service bulletin. POWER TRAIN; EQUIPMENT. This Preliminary information communicates to the dealer technician that the 10L60, 10L80 and the 10L90 transmissions have been place on a part restriction. Dealers are to contact the Product Quality Center before replacing the transmission assembly. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.