Chevrolet Silverado 2004–2005 — technical service bulletin
Bulletin 050849026 · NHTSA communication 10018716 · issued Nov 1, 2005
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2005
model years
4
vehicle entries
Official summary
Low oil pressure message display and chimes activated while driving following hybrid (hp2) lm7 engine auto-start (reprogram the pcm). *ts
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.