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Service bulletins for the 2012 Toyota Corolla

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.

350 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-0103-20 Rev12024-07-23. Service bulletin. ENGINE. This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2025 model year Toyota vehicles.
T-SB-0103-20 Rev12024-07-23. Service bulletin. ENGINE. This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2025 model year Toyota vehicles.
T-PANT-2024-004-2024-04-15. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. This is to advise of various price adjustments that will affect Toyota Genuine Motor Oil and Long Life Coolant, effective March 1, 2024. These products are ordered through the Toyota Complete Maintenance Care (TCMC) website.
T-TT-0628-202020-11-30. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. TT: HVAC drain tube is found to be blocked/clogged.
T-SB-0103-202020-11-30. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP; EQUIPMENT. TSB: This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 ? 2021 model year Toyota vehicles.
T-TT-0468-17 Rev2020-08-17. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. TT: HVAC drain tube is found to be blocked/clogged.
T-SB-0134-16-Rev2019-09-03. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM; ENGINE. TSB: REVISION NOTICE July 01, 2019 Rev2: ? Applicability has been updated to 2019 ? 2020 model year Toyota vehicles. ? The Techstream Preparation and Process Overview sections have been updated. October 30, 2017 Rev1: ? Applicability has been updated to include 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. SUPERSESSION NOTICE The information contained in this bulletin supersedes SB No. T-SB-0012-13. Service Bulletin No. T-SB-0012-13 is obsolete and any printed versions should be discarded. Be sure to review the entire content of this bulletin before proceeding. Flash reprogramming allows the Electronic Control Unit (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. NOTE ECU is a Toyota term used to describe integrated computerized devices responsible for managing the operation of a system or subsystem. For the purposes of this bulletin, the term ?ECU? is used as a generic label for the following SAE J1930 standard references: ? Powertrain Control Module (PCM) ? Engine Control Module (ECM) ? Transmission Control Module (TCM) ? Any other Toyota specific control unit
T-SB-0134-162018-11-26. Service bulletin. ENGINE. TSB: Supersession Notice. 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-TT-0362-152018-04-23. Service bulletin. ENGINE; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. 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.
TSB-0012-13 Rev22018-04-23. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. 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.
C0N Dealer Lette2018-04-23. Service bulletin. ENGINE. In certain 2011 and 2012 Model Year Toyota Corolla vehicles manufactured at TMMMS, the Positive Temperature Coefficient (PTC) Heater relays were not installed.
TC-12-0282018-04-23. Service bulletin. ENGINE. In certain 2011 and 2012 Model Year Toyota Corolla vehicles manufactured at TMMMS, the Positive Temperature Coefficient (PTC) Heater relays were not installed.
T-TT-0005-10 Rev2018-04-23. Service bulletin. ENGINE. Starting with the 2010 MY, Toyota began a gradual transition to the use of synthetic 0w-20 viscosity engine oil.
T-TT-0005-10 Rev2018-04-23. Service bulletin. ENGINE. Starting with the 2010 MY, Toyota began a gradual transition to the use of synthetic 0w-20 viscosity engine oil.
T-TT-0005-102018-04-23. Service bulletin. ENGINE. Starting with 2010 Model Year, Toyota began a gradual transition to the use of synthetic 0W-20 viscosity engine oil. There a re man benefits of this oil.
T-TT-0010-10 Rev2018-04-02. Service bulletin. BACK OVER PREVENTION; ENGINE. Tech Tip: Low battery voltage can contribute to a MIL "ON" condition for P0335 (Crankshaft Position Sensor Circuit) and/or P0340 (Camshaft Position Sensor Circuit) due to inconsistent rotational speed of the engine's crankshaft.
T-TT-0262-13 Rev2018-04-02. Service bulletin. ENGINE. Tech Tip: Starting with the 2010 Model Year, Toyota began a gradual transition to the use of synthetic 0w20 viscosity engine oil. There are multiple benefits of this oil including: Reduced friction and wear on engine surfaces, Improved fuel economy, Reduction in waste oil stream (in vehicles approved for 10,000 mile oil change intervals), Reduced maintenance cost (in vehicles approved for 10,000 mile oil change intervals). Due to the improved performance and durability of 0w20 synthetic oil, Toyota has extended the oil change intervals to 10,000 mile for most vehicles that require this oil. With this change, the following should be noted: The 2TR-FE (4Runner/Tacoma) and the 3UR-FBE (Flex Fuel Tundra/Sequoia) are the exceptions to this new change interval program; these engines have not been approved for the 10,000 mile interval at this time. A 5,000 mile oil change interval is still required for these vehicles. Also, the Flex Fuel 3UR-FBE requires a 2,500 mile interval when operated on E85 50% of the time or more. Only Toyota vehicles in which 0w20 oil is mandatory (except for the 2TR-FE & 3UR-FBE Engines) have been approved for extended oil change intervals. Vehicles in which 0w-20 is an option to 5w20 (or 5w30) will continue to require 5,000 mile change intervals, even if 0w20 oil is used. In case of vehicles with 10,000 mile oil change intervals, the 5,000 mile service interval has not been eliminated. The traditional 5,000 mile maintenance procedures (such as tire rotation) will continue to be required, and the fluid levels (including engine oil) will need to be checked and adjusted at this time. If the vehicle operation meets the standard criteria for "Special Operating Conditions" such as: driving off-road, on dirt roads, towing a trailer, making repeated short trips under 32 degrees F, or extensive idling, the engine oil must be replaced at 5,000 mile intervals, regardless of oil used.
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-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-SB-0280-172017-10-15. Service bulletin. ENGINE; ELECTRICAL SYSTEM. TSB: Some 2009 ? 2017 model year Corolla vehicles equipped with the 2ZR-FE or 2ZR-FAE engines may exhibit a condition in which engine oil leaks between the engine block and transaxle. The source of the leak may be caused by a leaking oil galley plug. The purpose of this bulletin is to provide a Repair Procedure to remove/replace the engine oil galley plug located at the back of the engine block. Follow the Repair Procedure in this bulletin to address this condition.
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-SB-0158-14 Rev2017-08-14. Service bulletin. ENGINE AND ENGINE COOLING. TSB: Some 2006 - 2013 model year vehicles equipped with 2AZ-FE or 2AZ-FXE engines may exhibit engine oil consumption. The piston assembly has been changed to minimize oil consumption. Use the Inspection Procedure in this bulletin to confirm this condition.

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