Chevrolet Silverado 2001–2004 — technical service bulletin
Bulletin 00574A · NHTSA communication 10005451 · issued Jan 1, 2004
Technical service bulletin
communication type
Electrical System
component
2001–2004
model years
8
vehicle entries
Official summary
Allison lct1000 no shift, speedometer erratic/inoperative, diagnostic trouble codes (dtcs) p0721, c0237 possible anti-lock brake system (abs) lamp on. Si bulletin 1408789. *tt
Vehicles covered
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.