Ford C-Max Energi 2013–2014 — technical service bulletin
Bulletin TSB-14-0151 · NHTSA communication 10056699 · issued Aug 18, 2014
Technical service bulletin
communication type
Engine
component
2013–2014
model years
3
vehicle entries
Official summary
Ford: an intermittent noise is heard mostly at specific speeds, rpm ranges, and vehicle loads, when engine is running and noise is loud, low frequency, and droning powertrain type, while driving up a grade or hill. Model 2013-14 c-max. *pe
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.