Service bulletin 21-NA-147
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.
| Type | Service bulletin |
|---|---|
| NHTSA id | 10247524 |
| Published by NHTSA | 2023-12-19 |
| Manufacturer's number | 21-NA-147 |
| Manufacturer's date | 2023-12-13 |
| NHTSA component | ENGINE AND ENGINE COOLING |
NHTSA's summary
This service bulletin provides a repair procedure to correct a customer concern of Coolant and/or Oil Leak, Malfunction Indicator Lamp (MIL) Illuminated.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Engine
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 2010170 | 2010-05-28. Engine |
|---|---|
| 10V223000 | 2010-05-25. ENGINE AND ENGINE COOLING |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| N262546590-01 | 2026-07-15. Service campaign. Certain vehicles listed above, may have a condition where coolant leaks from the radiator hose quick connect at the radiator inlet. This special coverage covers the condition described above for a period of 5 years or 60,000 miles (100,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after July 14, 2026, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to July 14, 2026, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to remove the inlet hose and replace the seal. The repairs will be made at no charge to the customer. |
|---|---|
| 00-06-01-026R | 2025-12-03. Service bulletin. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage. |
| 25-NA-132 | 2025-11-05. Service bulletin. This bulletin provides a procedure to verify a noise and replace the oil pump shaft assembly if the gears of the pump and balance shaft are found the issue of the customers concern. |
| 24-NA-201 | 2025-10-27. Service bulletin. This bulletin provides a procedure to replace the oil pump due to a loose drive pump gear not pressed on the pump shaft. |
| 23-NA-170 | 2025-10-25. Service bulletin. This bulletin advises the tech to inspect deeper into what may be to main cause of an engine failure. |
| 23-NA-153 | 2025-10-25. Service bulletin. The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay. |
| N252508350 | 2025-10-21. Service campaign. Certain vehicles listed above, may have a condition that could cause the engine coolant thermostat to open at a lower temperature than intended. If this condition were to occur, the Malfunction Indicator Lamp (Check Engine Light) will illuminate and a diagnostic trouble code will set. Additionally in some cases, the engine cooling fans may run after the engine is switched off. This special coverage covers the condition described above for a period of 15 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after October 21, 2025, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to October 21, 2025, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to replace the engine coolant thermostat as necessary. The repairs will be made at no charge to the customer. |
| 22-NA-080 | 2025-10-16. Service bulletin. This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder. |
| 25-NA-112 | 2025-09-06. Service bulletin. This bulletin provides a procedure to locate and repair a possible oil galley plug from between the engine and flexplate if found the cause of the customers concern of an oil leak from center of vehicle. |
| 25-NA-113 | 2025-08-22. Service bulletin. This bulletin provides a procedure to locate and repair a possible cooler galley plug if found the cause of the customers concern of an oil leak from front of vehicle. |