Toyota Prius 2010–2012 — technical service bulletin
Bulletin T-TT-0310-14 · NHTSA communication 10109465 · issued Oct 15, 2014
Technical service bulletin
communication type
Engine and Engine Cooling
component
2010–2012
model years
3
vehicle entries
Official summary
Tech Tip: Some customers may experience a Knocking sound and/or Runs Rough on engine start following a cold soak. This may or may not occur with DTC(s) P0300, P0301, P0302, P0303 and / or P0304.
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.