Toyota Prius 2010–2012 — technical service bulletin
Bulletin T-SB-0027-16 · NHTSA communication 10096982 · issued Mar 31, 2016
Technical service bulletin
communication type
Engine and Engine Cooling
component
2010–2012
model years
6
vehicle entries
Official summary
Tsb: some prius, prius v, and prius phv vehciles may eexhibvit a rough idle or tapping noise from the hv transaxle at cold start. The check engine light may also illuminate with (dtc) p0401 (exhaust gas recirculation flow insufficient detected). Due to excess carbon build-up at the valve assembly, the valve will stick, causing the engine rpm to fluctuate. Follow the procedures in this bulletin to address the condition.
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.