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Service bulletin 15617

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10089569
Published by NHTSA2017-01-26
Manufacturer's number15617
Manufacturer's date2015-11-04
NHTSA componentENGINE

NHTSA's summary

15617 - CUSTOMER SATISFACTION PROGRAM. CERTAIN VEHICLES EQUIPPED WITH A 6.2L (L86) ENGINE AND ENHANCED TOWING (NHT) MAY HAVE BEEN BUILT WITH AN INNER GRILLE NOT INTENDED FOR THIS APPLICATION. AT THE TRUCKS ADVERTISED TOWING CAPACITY OF 17,700 LBS. (8,025 KG.), ENGINE COOLANT AND ENGINE OIL TEMPERATURES MAY EXCEED DESIGN INTENT. THERE IS NO ENGINE OIL TEMP MONITORING OR CUSTOMER WARNING. PROLONGED TIME, OR MULTIPLE DRIVE CYCLES OVER THE ALLOWABLE MAX OIL TEMP MAY RESULT IN REDUCED OIL LIFE, ENGINE COMPONENT THERMAL STRESS, AND EVENTUAL ENGINE FAILURE. DEALERS ARE TO REPLACE THE INNER GRILLE.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
CHEVROLET SILVERADO 15002015 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 15002015 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20145772014-12-18. Engine
14V0070002014-01-13. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
00-06-01-026R2025-12-03. Service bulletin. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
23-NA-1532025-10-25. 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.
22-NA-0802025-10-16. Service bulletin. This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.
15-NA-0102025-07-07. Service bulletin. This service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California smog inspection or smog inspection in other states.
25-NA-0522025-04-28. Service bulletin. This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to oil in system.
25-NA-0522025-04-10. Service bulletin. This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to oil in system.
22-NA-0742025-02-12. Service bulletin. This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
20-NA-1662025-01-23. Service bulletin. This service bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.
09-06-04-026Z2025-01-23. Service bulletin. This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.