Service bulletins for the 2020 Cadillac CT5
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.
898 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| 050604022R | 2020-12-07. Service bulletin. FUEL SYSTEM, DIESEL. This bulletin provides information on the TOP TIER Detergent Gasoline Licensed Brands and the TOP TIER Diesel Fuel Licensed Brands that are recommended for use in all GM vehicles and the TOP TIER FUELS website URL. |
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| N202316150 | 2020-11-30. Service bulletin. ENGINE; ELECTRICAL SYSTEM; EQUIPMENT. Service Update - Certain 2020 model year Cadillac CT5 vehicles had the incorrect torque applied to the starter nut. (6Nm instead of 12Nm). The nut may loosen over time due to insufficient clampload. This could cause intermittent start issues, a no start condition, or prolonged crank times. Arcing or sparking may also occur. Dealers will tighten the starter nut to 12 Nm and replace any parts that show arcing. |
| N202308320 | 2020-11-30. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Customer Satisfaction Program - Certain 2020 model year Cadillac CT4, CT5, and Chevrolet Corvette vehicles, equipped with the Cadillac User Experience with embedded navigation or the Infotainment 3 premium system w/navigation (RPO IOT), may have a condition where the radio display is non-functional except for the backup camera. The embedded Multi-Media Controller (eMMC) firmware contains a defect that could cause a continuous rebooting condition. Rebooting will continue even after shutdown, resulting in a battery drain for the affected vehicle, and possibly a dead battery and a no-start condition. Dealers will replace the radio receiver. |
| 20NA213 | 2020-11-30. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE AND ENGINE COOLING. This service bulletin provides information on Improved Oil Filter Gasket Design for Spin-On Oil Filters PF63, PF64 and PF48. |
| 20NA196 | 2020-11-30. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides information and a service procedure for dealers/technicians on OnStar Over the Air Update for TTY / TDD Operation and Continuous Improvement Changes. |
| 16NA222 | 2020-11-30. Service bulletin. ENGINE. This bulletin provides information on Engine Concerns that could result from lack of scheduled maintenance, improper service or aftermarket calibrations. |
| PIC6391D | 2020-11-16. 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. |
| PIP5675G | 2020-11-16. 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. |
| PIC6408A | 2020-11-16. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a concern that could cause U0512 to set in the Image Processing Control Module and engineering is working on a resolution. |
| PIP5760 | 2020-11-16. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates the possibility of a flutter noise that can be transmitted through the engine mounts when the vehicle is operating in AFM mode. |
| PIC6390B | 2020-11-16. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a parts restriction is in place for the Central Gateway Module on 2020 Cadillac CT4, CT5, and Chevrolet Corvette. |
| PIP5675F | 2020-11-16. 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. |
| PIC6407D | 2020-11-16. Service bulletin. EQUIPMENT. This PI communicates a parts restriction is in effect on 2020 Cadillac CT4, CT5 and Chevrolet Corvette Amplifier. |
| PIP5756 | 2020-11-16. Service bulletin. STRUCTURE. This Preliminary information communicates the possibility of dtc p2101 being stored in history and not to replace throttle body for this issue unless instructed to do so through published diagnostics. |
| 110089005P | 2020-10-26. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only). |
| 20NA191 | 2020-10-26. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This technical bulletin provides repair information to correct a customer concern of Auto Start/Stop Disabled with Malfunction Indicator Lamp (MIL) Illuminated and DTC U0599 set. |
| 20NA178 | 2020-10-26. Service bulletin. STEERING; ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Service Driver Assist and/or Take Steering Messages on Start-up, Advanced Driver Assist Systems (ADAS) Features Not Available. |
| 20NA157 | 2020-10-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF. |
| 18NA306 | 2020-10-26. Service bulletin. EQUIPMENT; STRUCTURE:BODY. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA) (US dealers only). |
| 18NA115 | 2020-10-26. Service bulletin. ENGINE AND ENGINE COOLING. This Bulletin provides inspection/diagnosis/correction information on a cold start misfire and/or rough idle and DTC P0300 that may also be set. |
| 16NA019 | 2020-10-26. Service bulletin. POWER TRAIN. This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares. |
| N202294740-02 | 2020-10-26. Service bulletin. STEERING. Service update - certain vehicles may require individual software updates to multiple modules to address various minor issues such as steering feel and data communication. Dealers are to reprogram multiple modules. |
| N202305180 | 2020-10-26. Service bulletin. FORWARD COLLISION AVOIDANCE: SENSING SYSTEM: CAMERA. Service Update Bulletin - Certain 2020 model year Cadillac CT4 and CT5 vehicles may have a condition where the front windshield camera module may reset and lose communication with other modules. DTCs P25A2, U0265, U0566 and U1962 are set. The malfunction indicator light (MIL) may illuminate. Reprogram the front view camera. |
| PIP5755 | 2020-10-19. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates the possibility of a engine oil leak that may occur at the cam carrier gasket T joint area due to improper amount of sealer be applied |
| PIP5693C | 2020-10-19. Service bulletin. EQUIPMENT. The Preliminary Information communication advises the technician that the Product Quality Center has a part restriction for the E99 Engine Control Module. The dealer technician is advised to call the GM Product Quality Center for further assistance. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.