Ford F-250 SD 2011 — technical service bulletin
Bulletin AS-21579 · NHTSA communication 10039140 · issued Nov 1, 2010
Technical service bulletin
communication type
Engine and Engine Cooling
component
2011
model years
4
vehicle entries
Official summary
Ford: malfunction light is on with a stored trouble code. It is a voltage problem. 2011 f-super duty. *rm
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.