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Service bulletins for the 2012 Toyota Prius C

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.

366 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-TT-0086-112018-04-02. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE. TechTip: Condition - 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-TT-0051-102018-04-02. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER. If a customer states there is an unpleasant odor in the vehicle from the HVAC system, there are various factors that may be involved.
T-TT-0262-132018-04-02. Service bulletin. ENGINE. Due to the improved performance and durability of 0w-20 synthetic oil, Toyota has extended the oil change intervals to 10,000 miles for most vehicles that require this oil. With this change, the following should be noted
T-TT-0262-132018-04-02. Service bulletin. ENGINE. Starting with the 2010 Model Year, Toyota began a gradual transition to the use of synthetic 0w-20 viscosity engine oil. There are multiple benefits of this oil. Due to the improved performance and durability of 0w-20 synthetic oil, Toyota has extended the oil change intervals to 10,000 miles for most vehicle that require this oil.
T-TT-0432-17_Rev2018-04-02. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. TT: Rev2 Some Customers may complain about a Hybrid Vehicle Battery cooling system warning message. This warning message may appear when the HV Battery cooling system loses efficiency due to debris on the filter and or some object obstructing the air inlet. Refer to the information below to address this issue.
ZG8 POL17-05 War2018-04-02. Service bulletin. ENGINE. Warranty Policy Bulletin POL17-05: Toyota has received reports of customer concerns in which the vehicle may exhibit a combination of abnormal engine noise and rough idle caused by internal carbon deposit in the combustion chambers.
ZG8 Dealer Packa2018-04-02. Service bulletin. ENGINE. Dealer Package: Toyota is announcing a Warranty Enhancement Program to extend the warranty coverage for certain 2012 ? 2013 model year Scion iQ vehicles that exhibit a rough idle and abnormal noise condition caused by internal carbon deposit in the combustion chambers.
ZG8 Dealer Email2018-04-02. Service bulletin. ENGINE. Dealer Email: Toyota is announcing a Warranty Enhancement Program to extend the warranty coverage for certain 2012 ? 2013 model year Scion iQ vehicles that exhibit a rough idle and abnormal noise condition caused by internal carbon deposit in the combustion chambers.
ZG8 Region Lette2018-04-02. Service bulletin. ENGINE. Region Letter: In these vehicles, Toyota has received some reports where vehicles may exhibit a combination of abnormal engine noise and rough idle.
ZG8 Region Email2018-04-02. Service bulletin. ENGINE; BACK OVER PREVENTION. Region Email: Toyota is announcing a Warranty Enhancement Program to extend the warranty coverage for certain 2012 ? 2013 model year Scion iQ vehicles that exhibit a rough idle and abnormal noise condition caused by internal carbon deposit in the combustion chambers.
T-SB-0033-142018-04-02. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. Some vehicles in particular geographic areas may exhibit a condition where the HVAC Evaporator Drain Hose has become obstructed with an insect nest. An insect repellent drain hose tip (ARINIX® Tip) is now available to help minimize future occurrences of this environmental condition. For some models, a new drain hose is required to properly fit the ARINIX® Tip. Follow the procedures in this bulletin for proper handling and installation of this optional service part.
T-TT-0262-13 Rev2017-08-14. Service bulletin. ENGINE AND ENGINE COOLING. TT: Starting with 2010 Model Year, Toyota began a gradual transition to the use of synthetic 0w-20 viscosity engine oil. There are multiple benefits of this oil. Due to the them improved performance and durability of 0w-20 synthetic oil, Toyota has extended the oil change intervals to 10,000 miles for most vehicles that require this oil.
T-TT-0262-13 Rev2017-08-14. Service bulletin. ENGINE AND ENGINE COOLING. TT: Starting with 2010 Model Year, Toyota began a gradual transition to the use of synthetic 0w-20 viscosity engine oil. There are multiple benefits of this oil. Due to the them improved performance and durability of 0w-20 synthetic oil, Toyota has extended the oil change intervals to 10,000 miles for most vehicles that require this oil.
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-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.

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