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Service bulletins for the 2020 Chevrolet Blazer

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.

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

By type

By component

By trouble code

By topic

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
PIP5095G2020-08-10. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon and may also have an oil or coolant leak. Technician may find coolant or oil in a spark plug tube. If the Spark Plug Tube is leaking and it is determined that the oil or coolant is not coming from a leak above the spark plug then replace the cylinder Head, spark plug and coil.
PIP5675E2020-08-10. 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.
PIT57452020-08-10. Service bulletin. ELECTRICAL SYSTEM; SEATS. This Preliminary information communicates and issue with the memory seat module waking up the low speed GM lan bus and causing a battery draw.
20NA1322020-08-10. Service bulletin. ELECTRICAL SYSTEM. This warranty administration bulletin provides policy information on the requirements for battery testing and warranty replacements.
20NA0712020-08-10. Service bulletin. ELECTRICAL SYSTEM; SERVICE BRAKES, HYDRAULIC:POWER ASSIST; ENGINE. This technical bulletin provides repair information to correct a customer concern of the Service Engine Soon Lamp illuminated and/or Service Power Brake Assist message displayed, with DTCs P0557 or P0558 Stored.
20NA0122020-08-10. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; ELECTRICAL SYSTEM:SOFTWARE. This Technical bulletin provides service procedure information for dealers/technicians on Radio Software Version V135116 Over-the-Air Update.
N2022987702020-07-20. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; SERVICE BRAKES, ELECTRIC. Customer Satisfaction Program - Certain vehicles, equipped with 4 Cyl gas engines, may have incorrect instructions in the owner?s manual for Dinghy and Dolly Towing. Instructions should include disconnecting the negative battery cable when towing their vehicle. If not disconnected, the electronic brake control module may remain awake which could lead to draining the vehicle battery while being towed and the electronic stability control (ESC) may activate brakes under specific operation conditions while the vehicle is being towed. Dealers are to print and insert revised owner manual page(s) included with this bulletin.
PIE05672020-06-22. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to SD Code messages displayed on the Radio Screen and/or Instrument Cluster - Navigation System Malfunction.
070849020Q2020-06-22. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information for the IPC odometer programming method quick reference guide.
070604025M2020-06-22. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information on Clicking/Ticking Sound/Noise Heard During Cold Start and that this should be considered a normal characteristic.
060089029T2020-06-22. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. This informational bulletin includes information on Interior Cleaning - Instrument Panel (IP), Hard or Plastic Surfaces, Seats, Carpet, Leather, Vinyl, Fabric Cleaner, Stain Remover, Restorer - Product Availability.
060089029S2020-06-22. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. This informational bulletin includes information on Interior Cleaning - Instrument Panel (IP), Hard or Plastic Surfaces, Seats, Carpet, Leather, Vinyl, Fabric Cleaner, Stain Remover, Restorer - Product Availability.
19NA2692020-06-22. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. This Technical bulletin provides a service procedure for dealers/technicians on installation of Radio Software Version U148 Over-the-Air Update.
19NA2432020-06-22. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This technical bulletin provides a procedure for replacing the body plugs due to water leaking through the body plug above the connector X500 causing the connector to be corroded.
20NA0732020-05-26. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Loss of Brake Assist, Various Messages Displayed in DIC, Brake Pedal Travel and Apply May Feel Different, DTC C0024 Set.
20NA0712020-05-26. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. This technical bulletin provides repair information to correct a customer concern of the Service Engine Soon Lamp illuminated and/or Service Power Brake Assist message displayed, with DTCs P0557 or P0558 Stored.
20NA0122020-05-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This Technical bulletin provides service procedure information for dealers/technicians on Radio Software Version V135116 Over-the-Air Update.
19NA0762020-05-26. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Blue Screen and Service Rear Vision System Message on Radio Display.
20NA0122020-04-27. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE. This Technical bulletin provides service procedure information for dealers/technicians on Radio Software Version V135116 Over-the-Air Update.
20NA0672020-04-27. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin provides information for dealers/technicians on Accessory Rear Seat Infotainment (RSI) Shuts Off, Coinciding with Closing of Door or Liftgate.
PIP5697B2020-04-13. Service bulletin. ELECTRICAL SYSTEM; ENGINE; POWER TRAIN. This Preliminary information communicates a possible BCM concern if DTC P0747 sets during engine cranking when the transmission is in park.
PIP5675B2020-04-13. 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.
N2022948202020-03-23. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. Customer Satisfaction Program - The brake system control module software in these vehicles may contain an error. If (i) the vehicle is started remotely using the MyChevrolet, MyGMC, or MyCadillac mobile app or (ii) the driver enters the vehicle and waits five or more minutes before starting the vehicle using the ignition, this software error can, in rare cases, disable the vehicle?s electronic brake assist and illuminate the ESC, ABS and BRAKE telltales. This occurs at startup and the telltales are illuminated before the driver puts the vehicle into gear. Dealers will reprogram the brake system control module.
PIP5704A2020-03-09. Service bulletin. EQUIPMENT; STRUCTURE; ELECTRICAL SYSTEM. This Preliminary information communicates a work around when only 11 digit PUN (Part Unique Number) is seen on Service Solenoid Body Assembly.
030846004W2020-03-09. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides information regarding Part Restriction and Ordering Process Information for OnStar® Vehicle Communication Interface Modules (VCIM) (GMNA Only).

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