P3191 on Toyota

On Toyota hybrids, the engine did not start when the hybrid system asked it to

Severity: Inspect soon

Toyota bulletins pair this code with a lit warning lamp and a failed engine start; the car may lose its engine or not start, so get it checked soon.

It gets more serious if:

Stop: Stop somewhere safe if the engine will not start, the master or hybrid warning is on with a stop message, or power drops. Repeated start attempts can drain the hybrid battery, per CarSpecMN.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

This page covers only what differs on Toyota. For what P3191 means, the ranked causes and the test order, see the P3191 guide.

2001–2013 · Prius
Supported by vehicle data
Prius: Toyota bulletins list P3191 with P3190 and P0A0F from 2001; on 2010-2013 cars the purge VSV/PCV line separation and engine computer updates apply.
2012–2013 · Prius V
Supported by vehicle data
Prius v: same purge line bulletin as the Prius.

01202Status unverified
Master, hybrid and MIL lamps on with P3190, P3191 and P3101
2001–2002prius · issued November 1, 2002 · NHTSA 635855
Title-level summary only for the 2001-2002 Prius.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
01103Status unverified
Master, hybrid and MIL lamps on with P3190, P3191 and P3101
2001–2003prius · issued October 17, 2003 · NHTSA 10003359
Title-level summary only; updated 2007.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
02704Status unverified
MIL on with P3191, P3190 and/or P0A0F
2004–2005prius · issued November 15, 2004 · NHTSA 10010308
Title-level summary; supersedes EG027-04.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
TSB-0205-11REV-1Status unverified
Engine computer logic revision for P0A0F, P3190 and P3191
2010–2011prius · issued July 17, 2012 · NHTSA 10044581
Revises engine control module logic to address these codes.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
T-SB-0041-15Status unverified
P0A0F with P3190, P3191 and P0171: purge VSV/PCV line separation
2010–2013prius, prius-v · issued August 14, 2017 · NHTSA 10111144
Replace the purge VSV and reprogram the engine computer.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

T-SB-0041-15: P0A0F with P3190 and P3191 on Prius and Prius v — Toyota Motor Sales
TSB-0205-11 Rev 1: P0A0F, P3190 and P3191 engine computer logic — Toyota Motor Sales
2001-2009 Prius P3191, P3190, P0A0F quick checks — CarSpecMN

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error