Service bulletins for the 2021 Chevrolet Trailblazer
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.
753 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| PIT5791 | 2020-12-14. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; EQUIPMENT:APPLIANCE:TV/RADIO/SPEAKERS. This Preliminary information communicates a condition where the radio may display a :connection not availale, please call OnStar agent". This bulletin advises that Engineering is working on a software solution that will prevent the message from displaying when listening to non-SXM sources, but still allow the message to display when a loss of connectivity exists and the user is attempting to play Sirius XM. |
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| PIE0587 | 2020-12-07. Service bulletin. ENGINE AND ENGINE COOLING. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to loss of and/or reduced propulsion and multiple DTCs set. |
| 1308116001F | 2020-12-07. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION. The intent of this technical bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them. |
| 060089026Q | 2020-12-07. Service bulletin. EQUIPMENT. This warranty administration bulletin provides information on Warranty Administration - Customer Concern Not Duplicated (CCND) Labor Operation Numbers. |
| 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. |
| A202317281 01 | 2020-11-30. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR. Emission Recall - General Motors has decided to conduct a voluntary emission recall on certain vehicles with a 1.2L engine (RPO LIH). These vehicles may have received incorrect catalytic converter parts that do not meet all emission system requirements. Dealers are to inspect the catalytic converter and replace if the correct part was not installed. |
| A202317281 | 2020-11-30. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR. Emission Recall - General Motors has decided to conduct a voluntary emission recall on certain vehicles with a 1.2L engine (RPO LIH). These vehicles may have received incorrect catalytic converter parts that do not meet all emission system requirements. Dealers are to inspect the catalytic converter. |
| 20NA210 | 2020-11-30. Service bulletin. ELECTRICAL SYSTEM:ADAS:HILL START ASSIST:SOFTWARE; POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. This technical bulletin provides repair information to correct a customer concern of All-Wheel Drive Off and/or Service All-Wheel Drive System Messages Displayed in the DIC. |
| 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. |
| PIC6416A | 2020-11-16. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates to the dealer that if the service AWD (All-Wheel Drive) or AWD (All-Wheel Drive) Off messages are on and there is a history DTC of C15C9 SYM02 set then no repairs are to be made at this time, a software issue was found and Engineering is working on a permanent solution. If the DTC is setting current then published diagnosis needs to be followed. |
| PIP5758 | 2020-11-16. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates to the dealer technician a diagnostic tip related to a tapping noise from the engine. |
| 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. |
| 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). |
| 20NA186 | 2020-10-26. Service bulletin. PARKING BRAKE:ELECTRICAL. This technical bulletin provides repair information to correct a customer concern of an Unwanted Electric Park Brake Setting. |
| 20NA165 | 2020-10-26. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; STRUCTURE:BODY; ENGINE. This technical bulletin provides repair information to correct a customer concern of Flutter or Boom Noise at 1200 RPM- Service Calibration. |
| 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. |
| 20NA135 | 2020-10-26. Service bulletin. ELECTRICAL SYSTEM; STRUCTURE:BODY:HATCHBACK/LIFTGATE. This technical bulletin provides repair information to correct customer concerns of Power Liftgate and/or Instrument Panel Cluster (IPC) Inoperative, No Audio, AWD/ 2WD Light Toggles Randomly, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0650, P15A1, P159F-00, U0184-00, U0198-00 and/or U1501-00 Set. |
| 20NA028 | 2020-10-26. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin is to inform dealers that in extreme cold weather, a grille winter cover needs be added during PDI to avoid the customer returning with concerns related to charge air cooler icing. |
| 19NA200 | 2020-10-26. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides a repair procedure to correct a customer concern of start/stop inoperative, MIL illuminated w/DTC P2797. |
| 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). |
| 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. |
| A202317280 | 2020-10-26. Service bulletin. ENGINE AND ENGINE COOLING. Stop Delivery. Incorrect emission parts may have been installed on these vehicles. |
| A202310450 | 2020-10-26. Service bulletin. ELECTRICAL SYSTEM. Service Update - Certain vehicles may have condition that a MIL illuminates on the dash and technicians may find one or more following DTC(s) sets: P2B95, P2B08, P2B09, P2B0A, P2B96, P2B00, P2B01, or P2B02. Dealers are required to reprogram the engine control module. |
| PIP5692B | 2020-10-19. Service bulletin. ENGINE. This Preliminary Information communication advises the technician that the engine exchange program on vehicles equipped with engine Regular Production Option Code LIH has ended. This engine can now be ordered through the regular General Motors Customer Care and Aftersales parts process or Product Quality Center process for required dealers. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.