Chevrolet Silverado 2004–2005 — technical service bulletin

Bulletin 3328A · NHTSA communication 10014952 · issued May 12, 2005

Technical service bulletin

communication type

Engine and Engine Cooling

component

2004–2005

model years

vehicle entries

Official summary

Surge at idle or 1100 to 1400 rpm. *eh

Vehicles covered

2004 Chevrolet Silverado
2005 Chevrolet Silverado
2004 GMC Sierra
2005 GMC Sierra

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.