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P3191 on the 2010 Toyota PRIUS

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name P3191
T-SB-0205-11 Rev2018-04-23. Service bulletin. Some 2010-2011 model year Prius vehicles may exhibit a MIL "ON" condition with DTCs P3190, P3191, P0A0F, and/or purge VSV/PCV line separation from the throttle body housing.
T-SB-0041-152017-08-14. Service bulletin. TSB: Some 2010 - 2013 model year Prius and 2012 - 2013 model year Prius V vehicles may exhibit a MIL "ON" condition with Diagnostic Trouble Code(s) (DTCs) P0A0F (Engine Failed to Start), caused by Purge VSV/PCV line separation from the throttle body housing. One or more of the following DTCs may also set: * P3190 (Poor Engine Power) * P3191 (Engine Does NOT Start) * P0171 (System Too Lean [Bank One]) Replace the Purge VSV (Vacuum Switching Valve Assembly) and reprogram the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) with the latest calibration to address this condition.
T-SB-0041-152017-08-14. Service bulletin. TSB: Some 2010 - 2013 model year Prius and 2012 - 2013 model year Prius V vehicles may exhibit a MIL "ON" condition with Diagnostic Trouble Code(s) (DTCs) P0A0F (Engine Failed to Start), caused by Purge VSV/PCV line separation from the throttle body housing. One or more of the following DTCs may also set: * P3190 (Poor Engine Power) * P3191 (Engine Does NOT Start) * P0171 (System Too Lean [Bank One]) Replace the Purge VSV (Vacuum Switching Valve Assembly) and reprogram the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) with the latest calibration to address this condition.
TSB-0205-11REV-12012-07-17. Service bulletin. TOYOTA: TO ADDRESS THE CONDITION OF DIAGNOSTIC TROUBLE CODES (DTCS) THAT SOME VEHICLES ARE EXHIBITING (P0A0F, P3190, AND P3191), ENGINE CONTROL MODULE/ECM (SAE TERM: POWERTRAIN CONTROL MODULE/PCM) LOGIC WAS REVISED. *PE UPDATED 4/15/13. *PE

4 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.