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
| PIC6382F | 2020-10-19. Service bulletin. FORWARD COLLISION AVOIDANCE: SENSING SYSTEM: CAMERA. This PI communicates a parts restriction is in effect on 2020 cadillac CT4, and CT5 Front View Camera Module. |
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| PIP5737A | 2020-10-19. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates additional diagnostic tips when diagnosing engine oil leaks on these vehicles. |
| PIP5722A | 2020-10-19. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates to the dealer technician diagnostic tips to aid in finding root case of P0708 setting on vehicles equipped with 8L45, 8L90, 10L60, 10L80 and 10L90 transmissions. |
| 990089019U | 2020-10-05. Service bulletin. EQUIPMENT. This Warranty Administration bulletin provides information on Global Warranty Management (GWM) Warranty Parts Center (WPC) Parts Return Program Information. |
| 20NA174 | 2020-10-05. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Malfunction Indicator Lamp (MIL) Illuminated With DTC P037C. |
| 20NA159 | 2020-09-28. Service bulletin. TIRES. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only). |
| 20NA157 | 2020-09-28. Service bulletin. 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. |
| 18NA099 | 2020-09-28. 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. |
| 16NA361 | 2020-09-28. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin explains possible normal condition of a flare from 1st to 2nd, even if the trans had been repaired for the flare and its still noticed. |
| PIC6395B | 2020-09-14. Service bulletin. EQUIPMENT; POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY. This Preliminary information communicates a parts restriction is in place for the Automatic Transmission Control on 2020 Cadillac CT4, and CT5. |
| PIT5411U | 2020-09-14. Service bulletin. EQUIPMENT:ELECTRICAL; ELECTRICAL 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. |
| PIE0579 | 2020-09-08. Service bulletin. ELECTRICAL SYSTEM. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the malfunction indicator lamp (MIL) illuminated. |
| PIE0575 | 2020-09-08. Service bulletin. ELECTRICAL SYSTEM. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineers listed in regards to no fob detected message on driver information center (DIC), passive and backup inoperative and active functions working for all transmitters. |
| 150089002B | 2020-09-08. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; STRUCTURE. This bulletin provides information to dealers regarding transportation damage repair claim submission requirements. |
| 20NA008 | 2020-08-31. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This informational bulletin provides information for dealers/technicians on No MIL illuminated, ignore these DTCs if set in History. |
| 16NA338 | 2020-08-31. Service bulletin. ENGINE; POWER TRAIN. This Bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only. |
| N192282860 01 | 2020-08-10. Service bulletin. POWER TRAIN. Service Update (Population Expansion). Certain vehicles may have a condition where the transmission enters a neutral state when the internal range sensor (IRS) fault is active. Dealers are to reprogram the transmission control module. |
| PIC6388B | 2020-08-10. Service bulletin. ELECTRICAL SYSTEM:ADAS:BLINDSPOT:SENSORS; LANE DEPARTURE: BLIND SPOT DETECTION. This PI communicates a parts restriction is in effect on 2020 Cadillac CT4, and CT5 Side Blind Zone Module. |
| PIC6382E | 2020-08-10. Service bulletin. BACK OVER PREVENTION. This PI communicates a parts restriction is in effect on 2020 cadillac CT4, and CT5 Front View Camera Module. |
| PIC6414A | 2020-08-10. Service bulletin. SERVICE BRAKES, AIR:DISC:PADS; SERVICE BRAKES, AIR:DISC:ROTOR; EQUIPMENT. This Preliminary information communicates that there maybe a squeak or squeal noise caused by contact between the brake pad wear sensor and the rotor. |
| PIC6382D | 2020-08-10. Service bulletin. ELECTRICAL SYSTEM; FORWARD COLLISION AVOIDANCE: SENSING SYSTEM: CAMERA. This PI communicates a parts restriction is in effect on 2020 cadillac CT4, and CT5 Front View Camera Module. |
| PIP5675E | 2020-08-10. 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. |
| PIP5696B | 2020-08-10. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates that the transfer case control module is on engineering restriction to verify diagnostics and service information. |
| PIC6403B | 2020-08-10. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates to the dealer that programming modules must be done in OFF power module using MDI2 on 2020 Cadillac CT4,CT5, and Chevrolet Corvette. |
| PIP5737 | 2020-08-10. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:PIPES, HOSES, AND FITTINGS. This Preliminary information communicates additional diagnostic tips when diagnosing engine oil leaks on these vehicles. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.