Chevrolet Avalanche 1500 2007 — technical service bulletin
Bulletin 3950 · NHTSA communication 10020968 · issued Feb 2, 2007
Technical service bulletin
communication type
Engine and Engine Cooling
component
2007
model years
5
vehicle entries
Official summary
Intermittent service 4 wheel drive lamp on and code c0378. *kb updated 10/03/07. *nj
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.