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Service bulletins for the 2012 Toyota PRIUS

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.

467 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
T-SB-0041-152017-08-14. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). 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-TT-0310-142017-08-01. Service bulletin. ENGINE AND ENGINE COOLING. Tech Tip: Some customers may experience a Knocking sound and/or Runs Rough on engine start following a cold soak. This may or may not occur with DTC(s) P0300, P0301, P0302, P0303 and / or P0304.
ZF3_WARRANTY POL2017-06-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE). 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 LETTE2017-06-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE). 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 LETTE2017-06-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE). 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 LETTE2017-06-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE). 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 LETTE2017-06-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE). 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.
T-SB-0027-162017-04-06. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. 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.
T-TT-0362-152017-03-28. Service bulletin. ELECTRICAL SYSTEM; ENGINE. TT: THE VEHICLE MAY BE DIFFICULT TO START OR HAVE AN ABNORMALLY LOW OR ROUGH IDLE AFTER THE BATTERY HAS BEEN DISCONNECTED OR POWER TO THE ENGINE ECM HAS BEEN INTERRUPTED.
T-SB-0012-13 REV2017-03-21. Service bulletin. ENGINE; ELECTRICAL SYSTEM. "TSB: FLASH REPROGRAMMING ALLOWS THE ECU SOFTWARE TO BE UPDATED WITHOUT REPLACING THE ECU. FLASH CALIBRATION UPDATES FOR SPECIFIC VEHICLE MODELS/ECUS ARE RELEASED AS FIELD-FIX PROCEDURES DESCRIBED IN INDIVIDUAL SERVICE BULLETINS. THIS BULLETIN DETAILS THE TECHSTREAM ECU FLASH REPROGRAMMING PROCESS AND OUTLINES USE OF THE TECHNICAL INFORMATION SYSTEM (TIS) AND THE CALIBRATION UPDATE WIZARD (CUW). FLASH CALIBRATION UPDATES CAN ONLY BE APPLIED TO THE VEHICLE/ECU COMBINATION FOR WHICH THEY ARE INTENDED. ECUS HAVE INTERNAL SECURITY THAT WILL NOT ALLOW THEM TO BE PROGRAMMED WITH ANOTHER ECU’S INFORMATION."
T-SB-0116-152017-03-06. Service bulletin. ENGINE. 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.
T-SB-0116-15 REV2016-11-17. Service bulletin. ENGINE; HYBRID PROPULSION SYSTEM. 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-0075-132016-04-12. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
T-SB-0103-12 R12016-03-31. Service bulletin. ENGINE. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
T-SB-0010-122016-03-31. Service bulletin. ENGINE. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
TSB-0041-152015-09-18. Service bulletin. ENGINE. TOYOTA: DIAGNOSTIC TROUBLE CODE (DTC) POAOF ENGINE FAILS TO START, WITH MALFUNCTION INDICATOR LAMP (MIL) ON DUE TO PURGE VSV/PCV LINE SEPARATION OF THROTTLE BODY HOUSING. MODEL 2010-13 PRIUS, PRIUS V. *PE
TC-12-0112012-10-11. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. TOYOTA: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. EXHAUST GAS CONTROL ACTUATOR MAY POSSIBLE DEVELOP COOLANT LEAK CAUSING CHECK ENGINE LAMP AND WATER TEMP INDICATOR LAMP TO ILLUMINATE. MODELS 2011-2012 HIGHLANDER HV; MODEL 2012 PRIUS V. *PE
TSB-0198-112012-01-23. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. TOYOTA: BULLETIN PROVIDING INFORMATION ON THE MAINTENANCE AND CLEANING OF EXCESSIVE DUST, LINT, AND/OR OTHER DEBRIS THAT COULD BUILDUP ON HV BATTERY COOLING FAN THAT REDUCES EFFICIENCY OF THE SYSTEM. *PE MODEL 2010-2013 PRIUS. UPDATED 5/14/14. *PE

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.