Toyota Prius C 2012–2013 — technical service bulletin
Bulletin ZG8 POL17-05 War · NHTSA communication 10131891 · issued Mar 23, 2017
Technical service bulletin
communication type
Engine
component
2012–2013
model years
2
vehicle entries
Official summary
Warranty Policy Bulletin POL17-05: Toyota has received reports of customer concerns in which the vehicle may exhibit a combination of abnormal engine noise and rough idle caused by internal carbon deposit in the combustion chambers.
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.