Toyota Prius 2010–2012 — technical service bulletin
Bulletin T-SB-0075-13 · NHTSA communication 10132025 · issued May 30, 2013
Technical service bulletin
communication type
Engine and Engine Cooling
component
2010–2012
model years
4
vehicle entries
Official summary
Some 2010-2012 model year Prius vehicles equipped with a 2ZR-FXE engine may exhibit a MIL "ON" condition with Diagnostic Trouble Code P0401 (Exhaust Gas Recirculation Flow insufficient Detected) present. The Exhaust Gas Recirculation Valve has been improved to address this condition.
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.