Service bulletins for the 2021 GMC Sierra
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.
1649 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Engine are shown. Show all
| N212333800 | 2021-08-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ELECTRICAL SYSTEM. Emission Recall. General Motors has decided to conduct a voluntary emissions recall involving certain vehicles equipped with a performance air intake system (LPO RVK or 5W7). The Engine Control Module (ECM) may not have been programmed with the calibrations appropriate for the performance air intake system installed on the engine in these vehicles. Dealers will reprogram the ECM. |
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| N212336570 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); FUEL SYSTEM, GASOLINE. Service Update. Certain trucks may falsely set fuel injector diagnostic trouble codes P026C and/or P20EE. Dealers will reprogram the engine control module (ECM). |
| PIE0642A | 2021-08-09. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards the Service Engine Soon (SES) lamp illuminated and/or Service Emission System Message on the Driver Information Center (DIC). |
| PIE0617A | 2021-08-09. Service bulletin. ENGINE AND ENGINE COOLING. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to why is Engineering seeking more details on what is driving Engine Oil Cooler replacements through the warranty system. |
| PIE0609A | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR:INTEGRATED STARTER(OTHER THAN PROPULSION); EQUIPMENT; ELECTRICAL SYSTEM; ENGINE. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a noise heard from the engine compartment, loss of charging and/or reduced alternator output. |
| 21NA149 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:WIRING; ENGINE. This technical bulletin provides repair information to correct a customer concern of Engine Wire Harness Chafing. |
| 21NA139 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). This service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set. |
| 21NA132 | 2021-08-09. Service bulletin. ENGINE AND ENGINE COOLING. This informational bulletin provides Changes to the Automatic Stop/Start feature for Certain 2021 Escalade models, Silverado 1500, Suburban, Tahoe, Sierra 1500, Yukon models Equipped with RPO NSS. |
| 21NA125 | 2021-08-09. Service bulletin. ENGINE AND ENGINE COOLING. This service bulletin provides a procedure to correct a condition of a Service Emission System and/or Service Engine Soon Lamp Illuminated on Driver Information Center (DIC), DTC P208B Set. |
| 21NA095 | 2021-08-09. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This technical bulletin provides a procedure to seal the exhaust at the UFSCR and Tailpipe flange. |
| PIE0642 | 2021-08-09. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards the Service Engine Soon (SES) lamp illuminated and/or Service Emission System Message on the Driver Information Center (DIC). |
| PIE0637 | 2021-08-09. Service bulletin. ENGINE. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to one or more of the following condition Stalls, Crank with no star, Check Engine Lamp illuminated on the Driver Information Center (DIC). |
| PIE0602B | 2021-08-09. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service Engine Soon Lamp illuminated on Driver Information Center. |
| 21NA109 | 2021-07-19. Service bulletin. ENGINE. This service bulletin provides diagnostic information for a customer concern of engine vibration. |
| 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. |
| 21NA128 | 2021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides repair information to correct a customer concern of MIL Illuminated- ECM Update for P026C, P20EE, or P11D5. |
| 21NA113 | 2021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides a procedure to perform a learn procedure for the turbo actuator. |
| 21NA109 | 2021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. This service bulletin provides diagnostic information for a customer concern of engine vibration. |
| 21NA096 | 2021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides a procedure to program the ECM to correct the customers concern. |
| 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. |
| 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. |
| PIP5776D | 2021-06-14. Service bulletin. ENGINE. This Preliminary information communicates that a vehicle may exhibit a misfire condition resulting in misfire codes P0300-P308. Upon diagnosis it may be discovered the lifter has come apart. It is recommended to replace the lifter guide and the four lifters. |
| PIP5805 | 2021-06-14. Service bulletin. ENGINE. This Preliminary information communicates that the performance air cleaner kit (cold air intake system) can only be installed on vehicles that had the option ordered for the vehicle when it was produced. This performance air filter kit can not be installed on vehicles that were not ordered / produced with this option. This document also reinforces, the vehicles that did have the kit ordered and installed, a calibration is needed to make the kit work properly or DTC's may set. |
| 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. |
| PIP5776C | 2021-05-17. Service bulletin. ENGINE. This Preliminary information communicates that a vehicle may exhibit a misfire condition resulting in misfire codes P0300-P308. Upon diagnosis it may be discovered the lifter has come apart. It is recommended to replace the lifter guide and the four lifters. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.