Chevrolet Colorado 2004–2009 — technical service bulletin
Bulletin PIT-4835 · NHTSA communication 10030209 · issued Apr 1, 2009
Technical service bulletin
communication type
Exterior Lighting
component
2004–2009
model years
12
vehicle entries
Official summary
Gmc/chevrolet: headlamp switch inop in manual mode only. Headlights are always functional in automatic mode. This could be the result of a relay installed in the incorrect position with the ubec. *pe
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.