Service bulletins for the 2021 GMC Yukon
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.
1240 on file from NHTSA, as of 2026-10-19.
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By component
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Only bulletins with component: Engine are shown. Show all
| 010601011L | 2021-03-01. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION; EQUIPMENT. This informational bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption. |
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| N202319660 01 | 2021-03-01. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin. |
| N202310850 02 | 2021-03-01. Service bulletin. ELECTRICAL SYSTEM; SEATS; ENGINE AND ENGINE COOLING; EQUIPMENT; AIR BAGS. Customer Satisfaction Program (Revised Service Procedure and Part Ordering Information). In certain vehicles, driver movement can disrupt the electrical connection to the seat-mounted inboard airbag system. This airbag system is supplemental and not required equipment under applicable Federal Motor Vehicle Safety Standards. If this occurs, the vehicle?s driver information center will display a ?Service Restraints System? message to the driver before resistance at the connection will prevent the deployment of the airbag. Dealers are to verify the DTC B14DC is present and replace the affected driver inboard side seat wiring harness connector assembly as necessary. |
| N202310850 Reope | 2021-03-01. Service bulletin. EQUIPMENT; SEATS; ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Customer Satisfaction Program (VINS re-opened, software updated). In certain vehicles, driver movement can disrupt the electrical connection to the seat-mounted inboard airbag system. This airbag system is supplemental and not required equipment under applicable Federal Motor Vehicle Safety Standards. If this occurs, the vehicle?s driver information center will display a ?Service Restraints System? message to the driver before resistance at the connection will prevent the deployment of the airbag. Dealers are to verify the DTC B14DC is present and replace the affected driver inboard side seat wiring harness connector assembly as necessary. |
| N202310850 01 | 2021-03-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; AIR BAGS; ENGINE AND ENGINE COOLING; SEATS. Customer Satisfaction Program (Revised Correction, Service Procedure and Warranty Information). In certain vehicles, driver movement can disrupt the electrical connection to the seat-mounted inboard airbag system. This airbag system is supplemental and not required equipment under applicable Federal Motor Vehicle Safety Standards. If this occurs, the vehicle?s driver information center will display a ?Service Restraints System? message to the driver before resistance at the connection will prevent the deployment of the airbag. Dealers are to verify the DTC B14DC is present and replace the affected driver inboard side seat wiring harness connector assembly as necessary. |
| 20NA228 | 2021-02-22. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); FUEL SYSTEM, OTHER:FUEL FILTER. This technical bulletin provides a procedure to replace the fuel filter and perform a filter life procedure if found the reason for a failed fuel filter life reset during ECM transfer of data. |
| 20NA218 | 2021-02-22. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; EQUIPMENT. This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6. |
| 19NA218 | 2021-02-22. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides a service procedure to correct a condition of Ticking Noise from the Engine. |
| 17NA166 | 2021-02-22. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides a procedure to measure vibration and install engine mounts to correct a Rough Idle in Drive concern. |
| N202319660 01 | 2021-02-22. Service bulletin. ENGINE AND ENGINE COOLING. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin. |
| N202321230 | 2021-02-16. Service bulletin. LANE DEPARTURE; FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING. Service Update. On certain vehicles the clamp may not be properly aligned and positioned on the hose, or the hose is rolled over on the pump port. The improper assembly can quickly develop into a significant leak early in the truck?s life. As the coolant level drops, a Low Coolant Warning or potential for engine overheat with DIC message is possible. Dealers are to inspect for both the vertical and horizontal hose at the auxiliary coolant pump, and repair as needed. |
| N202319660 01 | 2021-02-16. Service bulletin. ENGINE; EQUIPMENT. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin. |
| N202310850 02 | 2021-02-16. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; AIR BAGS; EQUIPMENT. Customer Satisfaction Program (Revised Service Procedure and Part Ordering Information). In certain vehicles, driver movement can disrupt the electrical connection to the seat-mounted inboard airbag system. This airbag system is supplemental and not required equipment under applicable Federal Motor Vehicle Safety Standards. If this occurs, the vehicle?s driver information center will display a ?Service Restraints System? message to the driver before resistance at the connection will prevent the deployment of the airbag. Dealers are to verify the DTC B14DC is present and replace the affected driver inboard side seat wiring harness connector assembly as necessary. |
| N202310850 01 | 2021-02-16. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT; AIR BAGS; ELECTRICAL SYSTEM. Customer Satisfaction Program (Revised Correction, Service Procedure and Warranty Information). In certain vehicles, driver movement can disrupt the electrical connection to the seat-mounted inboard airbag system. This airbag system is supplemental and not required equipment under applicable Federal Motor Vehicle Safety Standards. If this occurs, the vehicle?s driver information center will display a ?Service Restraints System? message to the driver before resistance at the connection will prevent the deployment of the airbag. Dealers are to verify the DTC B14DC is present and replace the affected driver inboard side seat wiring harness connector assembly as necessary. |
| N202310850 | 2021-02-16. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; AIR BAGS; ENGINE AND ENGINE COOLING. Customer Satisfaction Program. In certain vehicles, driver movement can disrupt the electrical connection to the seat-mounted inboard airbag system. This airbag system is supplemental and not required equipment under applicable Federal Motor Vehicle Safety Standards. If this occurs, the vehicle?s driver information center will display a ?Service Restraints System? message to the driver before resistance at the connection will prevent the deployment of the airbag. Dealers are to verify the DTC B14DC is present and replace the affected driver inboard side seat wiring harness connector assembly as necessary. |
| PIE0601A | 2021-02-01. Service bulletin. 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 the Service Engine Soon Lamp being illuminated. |
| 090604026S | 2021-02-01. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING. This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2. |
| 010601011L | 2021-02-01. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. This informational bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption. |
| 20NA228 | 2021-02-01. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); FUEL SYSTEM, GASOLINE; EQUIPMENT. This technical bulletin provides a procedure to replace the fuel filter and perform a filter life procedure if found the reason for a failed fuel filter life reset during ECM transfer of data. |
| 20NA218 | 2021-02-01. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; ENGINE AND ENGINE COOLING. This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6. |
| 19NA218 | 2021-02-01. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE AND ENGINE COOLING. This technical bulletin provides a service procedure to correct a condition of Ticking Noise from the Engine. |
| 17NA166 | 2021-02-01. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. This technical bulletin provides a procedure to measure vibration and install engine mounts to correct a Rough Idle in Drive concern. |
| N202319660 01 | 2021-02-01. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin. |
| N202319660 | 2020-12-21. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin. |
| PIE0601 | 2020-12-21. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. 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 being illuminated. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.