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
| 20NA218 | 2021-07-19. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6. |
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| 20NA159 | 2021-07-19. Service bulletin. EQUIPMENT. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only). |
| 20NA121 | 2021-07-19. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. This service bulletin provides a procedure to locate and fix a possible leak in the roof area due to missing sealant to correct customer concerns of Various Electrical Issues, No Start, Stall, Brake Lamp Not Off, Radio Inoperative, Remote Key Inoperative, Malfunction Indicator Lamp (MIL) Illuminated with Possible DTCs. |
| 19NA044 | 2021-07-19. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This service bulletin provides information on the cold start control system in DI engines to reduce cold start emissions and improve fuel economy. |
| 18NA306 | 2021-07-19. Service bulletin. EQUIPMENT. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA). |
| 18NA279 | 2021-07-19. Service bulletin. LATCHES/LOCKS/LINKAGES; ELECTRICAL SYSTEM. This service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking. |
| 21NA124 | 2021-07-06. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set. |
| 21NA017 | 2021-07-06. Service bulletin. STRUCTURE. This technical bulletin provides repair information to correct a customer concern of a rattle or creak noise heard coming from driver left rear quarter panel area when driving over bumps. |
| 20NA218 | 2021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. This service bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6. |
| 20NA159 | 2021-07-06. Service bulletin. TIRES. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only). |
| 20NA121 | 2021-07-06. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This service bulletin provides a procedure to locate and fix a possible leak in the roof area due to missing sealant to correct customer concerns of Various Electrical Issues, No Start, Stall, Brake Lamp Not Off, Radio Inoperative, Remote Key Inoperative, Malfunction Indicator Lamp (MIL) Illuminated with Possible DTCs. |
| 19NA044 | 2021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. This service bulletin provides information on the cold start control system in DI engines to reduce cold start emissions and improve fuel economy. |
| 18NA306 | 2021-07-06. Service bulletin. EQUIPMENT. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA). |
| 18NA279 | 2021-07-06. Service bulletin. LATCHES/LOCKS/LINKAGES. This service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking. |
| A202317281 02 | 2021-06-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR. Emission Recall. Certain vehicles with a 1.2L engine (RPO LIH) 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. |
| PIT5842 | 2021-06-14. Service bulletin. STEERING; ELECTRICAL SYSTEM. This Preliminary information communicates to the dealer if there is a Service Power Steering message illuminated on Driver Information Center (DIC). There will be no driveability or steering related issues other than the message. Upon a GDS2 scan check DTC C0051 SYM58 (Steering Wheel Angle Sensor Performance) will be stored in the K43 Power Steering Control Module. If there are no driveability or steering issues as mentioned above, then clear out the DTC. Engineering is working on a permanent solution. As more information becomes available this PI will be updated or advanced to a bulletin. |
| PIE0620B | 2021-06-07. Service bulletin. ELECTRICAL SYSTEM; STEERING. This engineering information (EI) closure ends the need for further information from the field in regards to a Service Power Steering Message Illuminated on Driver Information Center (DIC), DTC C0051 58 Set. |
| PIE0620A | 2021-06-07. Service bulletin. STEERING; ELECTRICAL SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards a Service Power Steering Message Illuminated on Driver Information Center (DIC), DTC C0051 58 Set. |
| 070089036J | 2021-06-07. Service bulletin. EQUIPMENT. This service bulletin provides information on Enhancing Field Product Reports with Digital Pictures. |
| 050308002I | 2021-06-07. Service bulletin. SUSPENSION. This service bulletin provides information to dealership personnel on diagnosis and replacement of shock absorber and strut due to fluid leak. |
| 020089002T | 2021-06-07. Service bulletin. EQUIPMENT. This service bulletin provides information for dealers/technicians on When and How to Submit a Field Product Report (FPR) (U.S. Dealers Only). |
| 000601026N | 2021-06-07. Service bulletin. ENGINE. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage. |
| 21NA103 | 2021-05-24. Service bulletin. EQUIPMENT. This service bulletin provides information regarding Witness Marks from Panel Adjustments Made During Manufacturing and that it is considered a normal condition. |
| 21NA092 | 2021-05-24. Service bulletin. EXTERIOR LIGHTING. This service bulletin provides repair information to correct a customer concern of Intermittent Malfunction Indicator Lamp (MIL) Illuminated - DTC P146F Set. |
| 21NA068 | 2021-05-24. Service bulletin. EQUIPMENT:ELECTRICAL. This warranty administration bulletin provides policy information requirements applicable to key fob replacement under the New Vehicle Limited Warranty or under a Replacement Parts Warranty on 2017-2022 and newer model year vehicles with RPO ATH and AVJ (U.S. Only). |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.