Chevrolet Silverado 2003 — technical service bulletin
Bulletin 03063 · NHTSA communication 10005361 · issued Dec 17, 2003
Technical service bulletin
communication type
Engine and Engine Cooling
component
2003
model years
2
vehicle entries
Official summary
03063 - obd system software upgrade - on-board diagnostic (obd) system software upgrade - diagnostic trouble code (dtc) p0128 engine coolant temperature below thermostat regulating temperature. *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.