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Service bulletin 050604021

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 id10015005
Published by NHTSA2005-05-14
Manufacturer's number050604021
Manufacturer's date2005-03-01
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL

NHTSA's summary

REVISED INSPECTION/MAINTENANCE (I/M) EVAPORATIVE EMISSION (EVAP) SYSTEM SET PROCEDURE. *TT

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, Exhaust and emissions

Vehicles listed
BUICK RAINIER2004
CADILLAC ESCALADE2003, 2004
CHEVROLET ASTRO2003 to 2004
CHEVROLET AVALANCHE2003, 2004
CHEVROLET BLAZER2003, 2004
CHEVROLET EXPRESS2003, 2004
CHEVROLET S102003 to 2004
CHEVROLET SILVERADO2003, 2004
CHEVROLET SSR2003, 2004
CHEVROLET SUBURBAN2003, 2004
CHEVROLET TAHOE2003, 2004
CHEVROLET TRAILBLAZER2003, 2004
GMC ENVOY2003, 2004
GMC JIMMY2003 to 2004
GMC SAFARI2003, 2004
GMC SAVANA2003, 2004
GMC SIERRA2003, 2004
GMC SONOMA2004
GMC YUKON2003, 2004
HUMMER H22003, 2004
ISUZU ASCENDER2003, 2004
ISUZU NPR2003 to 2004
ISUZU NQR2003, 2004

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

Recalls for the same vehicles and component
06V2890002006-08-03. 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.

Other bulletins for the same vehicles and component
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18-NA-0732024-10-11. Service bulletin. This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and prevent unnecessary engine replacement.
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06-06-01-019C2024-03-19. Service bulletin. This bulletin advises the technician of possible location of an internal coolant leak from a specific cylinder head and location.
22-NA-0742024-02-29. 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.
PI1394B2024-02-02. Service bulletin. This PI bulletin advises the technician on the proper way to install the pistons in an engine.
1300890092023-12-11. Service bulletin. Expanded Availability for Remanufacture and Return (R&R) Electronic Control Modules
03-00-91-001I2023-11-22. Service bulletin. This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.