Service bulletin T-SB-0027-16

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10134309
Published by NHTSA	2018-04-23
Manufacturer's number	T-SB-0027-16
Manufacturer's date	2016-03-31
NHTSA component	ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)

NHTSA's summary

TSB: Some Prius, Prius V, and Prius PHV vehciles may exhibit 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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Exhaust and emissions, EGR valve

Trouble codes named

P0401

Vehicles listed
TOYOTA PRIUS	2010, 2011, 2012
TOYOTA PRIUS PLUG-IN HYBRID	2010 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA PRIUS PLUG-IN HYBRID	2012 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA PRIUS V	2012

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
ZF3_Toyota POL16	2019-09-16. Service bulletin. Warranty Enhancement Program: Toyota has received reports of a rough idle and/or rattle noise from the transaxle at cold start due to a sticking Exhaust Gas Recirculation (EGR) Valve in some vehicles. If this occurs, the vehicle may illuminate the check engine light and set diagnostic trouble code (DTC) P0401.
T-SB-0027-16	2018-04-23. Service bulletin. TSB: Some Prius, Prius V and Prius PHV vehicles may exhibit a vibration due to rough idle and/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 this condition.
ZF3_Warranty Pol	2018-04-23. Service bulletin. Warranty Policy Bulletin (POL16-04): In these vehicles, Toyota has received some reports of a rough idle and/or rattle noise from the transaxle at cold start due to a sticking Exhaust Gas Recirculation (EGR) Valve. If this occurs, the vehicle may illuminate the check engine light and set diagnostic trouble code (DTC) P0401.
ZF3_Dealer Lette	2018-04-23. Service bulletin. Dealer Letter: In these vehicles, Toyota has received some reports of a rough idle and/or rattle noise from the transaxle at cold start due to a sticking Exhaust Gas Recirculation (EGR) Valve. If this occurs, the vehicle may illuminate the check engine light and set diagnostic trouble code (DTC) P0401.
ZF3_Dealer Lette	2018-04-23. Service bulletin. Dealer email: In these vehicles, Toyota has received some reports of a rough idle and/or rattle noise from the transaxle at cold start due to a sticking Exhaust Gas Recirculation (EGR) Valve. If this occurs, the vehicle may illuminate the check engine light and set diagnostic trouble code (DTC) P0401.
ZF3_Region Lette	2018-04-23. Service bulletin. Region Letter: In these vehicles, Toyota has received some reports of a rough idle and/or rattle noise from the transaxle at cold start due to a sticking Exhaust Gas Recirculation (EGR) Valve. If this occurs, the vehicle may illuminate the check engine light and set diagnostic trouble code (DTC) P0401.
ZF3_Region Lette	2018-04-23. Service bulletin. Region email: In these vehicles, Toyota has received some reports of a rough idle and/or rattle noise from the transaxle at cold start due to a sticking Exhaust Gas Recirculation (EGR) Valve. If this occurs, the vehicle may illuminate the check engine light and set diagnostic trouble code (DTC) P0401.
ZF3_Warranty Pol	2017-08-14. Service bulletin. Warranty Policy Bulletin (POL16-04): Toyota has received reports of a rough idle and/or rattle noise from the transaxle at cold start due to a sticking Exhaust Gas Recirculation (EGR) Valve in some vehicles. If this occurs, the vehicle may illuminate the check engine light and set diagnostic trouble code (DTC) P0401.
T-SB-0116-15 Rev	2017-08-14. Service bulletin. TSB: REVISION NOTICE August 11, 2016 Rev1: Applicability has been updated to include 2016 model year Prius V vehicles. Any previous printed versions of this bulletin should be discarded. Some 2010 - 2015 model year Prius (2ZR-FXE equipped) vehicles, 2012 - 2015 model year Prius PHV vehicles, and 2012 - 2016 Prius V (2ZR-FXE equipped) vehicles may exhibit a "runs rough" and/or MIL "ON" condition with DTC(s) P0300, P0301, P0302, P0303, and P0304 (Misfire) during light acceleration while the Exhaust Gas Recirculation (EGR) system is active. Replace the Intake Manifold assembly to address this condition.
T-SB-0116-15	2017-08-14. Service bulletin. TSB: Some 2010 - 2015 model year Prius (2ZR-FXE equipped) vehicles and 2012 - 2015 model year Prius PHV and Prius V (2ZR-FXE equipped) vehicles may exhibit a "runs rough" and/or MIL "ON" condition with DTC(s) P030# (Misfire) during light acceleration while the Exhaust Gas Recirculation (EGR) system is active. Replace the intake manifold assembly to address this condition.