Chevrolet Avalanche 2003–2004 — technical service bulletin
Bulletin 01267A · NHTSA communication 10004104 · issued Nov 18, 2003
Technical service bulletin
communication type
Power Train
component
2003–2004
model years
12
vehicle entries
Official summary
Service 4wd light on, the 4wd is inoperative and no codes besides u1000 codes. Service vme. *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.