2021 Mazda MAZDA3 Technical Service Bulletins

634 technical service bulletins (TSBs) are on record for the 2021 Mazda MAZDA3. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11016237Mar 21, 2025Engine, Other or unknown. Frequently Asked Questions (FAQ)
• 11016235Mar 20, 2025Other or unknown. The new AWD rear differential DOES NOT come with a breather cap on the rear of the differential, therefore a new one will need to be ordered and installed when replacing the differential. NOTE: The breather threads have a sealant and locking compound that prevents it from being reused. Refer to GEPC for the correct part number of the Differential Breather. The instructions on MGSS will be updated soon to include…
• 11016214Mar 13, 2025Electrical system, Body and structure. Some CX-5 and CX-30 customers may find that the liftgate does not close when pressing the power liftgate (PLG) rear switch (A) located on the interior liftgate trim. This may be caused by PLG switch corrosion. Water from a high pressure car washer and/or condensation may drip onto the switch connector and cause corrosion. To eliminate this concern, the PLG rear switch has been modified with a waterproof connector.
• 11016199Mar 13, 2025Engine. Some customers may experience a check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: Engine takes longer to warm up. Engine temperature gauge fluctuates. Low coolant temperature indicator (blue) light stays on longer or turns on while driving. Poor heater performance, especially at idle. NOTE: Vehicles with SKYACTIV-G 2.5T are not applicable to this service…
• 11016300Mar 11, 2025Engine. SSPD8 - SPECIAL SERVICE PROGRAM WARRANTY EXTENSION - MULTI-MODEL - CHECK ENGINE LIGHT ON WITH DTC P0126:00.Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) to extend the warranty coverage for a specific repair of the fail-safe thermostat in the coolant control valve on certain CX-5, Mazda3, CX-3, Mazda6 and CX-30 vehicles that are equipped with the suspected coolant control valve.
• 11016299Mar 11, 2025Engine. SSPD8 - SPECIAL SERVICE PROGRAM WARRANTY EXTENSION - MULTI-MODEL - CHECK ENGINE LIGHT ON WITH DTC P0126:00.Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) to extend the warranty coverage for a specific repair of the fail-safe thermostat in the coolant control valve on certain CX-5, Mazda3, CX-3, Mazda6 and CX-30 vehicles that are equipped with the suspected coolant control valve.
• 11016209Mar 10, 2025Other or unknown. Some vehicles may experience a sunvisor that does not stay in the fully retracted position (as shown below). The left and/or right side sunvisor may lower slightly due to its own weight. The part where the sunvisor connects is broken, so the spring cannot hold the sunvisor in the fully retracted position.
• 11016198Mar 6, 2025Engine. Some vehicles may exhibit oil seepage or oil leak onto the engine front cover, which becomes more apparent with dust adhesion.
• 11014991Feb 28, 2025Electrical system, Other or unknown. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
• 11014983Feb 28, 2025Body and structure, Other or unknown. Some customers will report that their fuel door was stuck closed and would not open to refuel the vehicle. Follow the repair steps below unless the conditions outlined in TSB 09-007/25 - FUEL-FILLER LID PANEL IS DEFORMED for 2019-2025 Mazda3 and 2020-2025 CX-30 are present.
• 11015005Feb 19, 2025Other or unknown. Some customers may experience a Connected Vehicle failure. The MyMazda App may display an Error Code. This document provides Error Code description and recovery information to assist with repairs.
• 11015003Feb 8, 2025Electrical system. Key Transmitter Power Saving Function: When the key transmitter Power Saving Function is turned ON, transmitter battery power consumption is restricted, thereby extending the transmitter battery life and the following will occur: The engine will not start unless the key transmitter is held over the Start Stop button. • Outside door handle lock/unlock touch sensor is inoperative. • Key transmitter indicator lights…
• 11014812Feb 8, 2025Electrical system, Other or unknown. Some vehicle may experience the i-ACTIVSENSE/ALH warning lights on and a system error messages may be found in the center display as well. DTC U3000:04 (FSC) is stored in memory • DTC U3000:04 (FSC) - Forward sensing camera (FSC) internal malfunction • This may be caused by a hardware failure in an internal device of the FSC that results in the malfunction detection. To eliminate this concern, the production…
• 11014977Feb 5, 2025Electrical system. Some customers may complain about intermittent audio no sound from the MAZDA CONNECT infotainment system and/or static noise from the speakers. The concern may be reproduced by tapping on the dash pad near the MAZDA CONNECT center display and the following DTC's may be stored. U0186:08 Communication error with audio amplifier • U2145:08 Communication error with remote tuner (RT) • U2145:02 Communication error with…
• 11015004Feb 4, 2025Electrical system, Other or unknown. The Mazda DCA-8000 is required for all warranty battery testing. If the Mazda DCA-8000 is not used, incorrect battery testing may result in unnecessary battery replacement. Use the following test procedures in this Service Bulletin to test Mazda vehicle batteries and to generate a Warranty Code.
• 11013659Jan 30, 2025Body and structure. Some customers may notice the front door window(s) do not open. This may be caused by the lower window cable corrosion and damage. To eliminate this concern, the following improvements have been made: The shape of the power window regulator pulley has been modified to prevent cable damage. The shape of the carrier plate has been modified to prevent the cable from being exposed to water/moisture.
• 11013568Jan 30, 2025Body and structure. Some vehicles may exhibit a deformed fuel-filler lid panel (1) attached to the fuel-filler lid box, resulting in a poor appearance. This concern is caused by the lid box not having enough water drainage capability which leads to the accumulation of water inside it. The water then freezes in cold weather and expands or the inner side of the lid panel absorbs the water and swells from long exposure, deforming the lid…
• 11013654Jan 24, 2025Steering. Some vehicles may exhibit wear/peel-off of the leather steering wheel surface causing a poor appearance. This concern may be caused by an insufficient wear resistance of the steering wheel surface.
• 11013788Jan 22, 2025Electrical system, Engine, Other or unknown. Key Transmitter Power Saving Function: When the key transmitter Power Saving Function is turned ON, transmitter battery power consumption is restricted, thereby extending the transmitter battery life. NOTE: Some customers may complain about an engine no start. This may be caused by the customer inadvertently putting the key transmitter in Power Saving Function.
• 11013658Jan 22, 2025Seats. Some customers may complain that the seat warmer does not operate when turning the ignition on while the seat is warm but when turning the ignition off then on again, the seat warmer begins to operate appropriately. DTCs “B1030:13” and/or “B1032:13” are stored. This is caused by the seat warmers fail-safe mode which prevents it from working during the initial drive cycle. To correct this issue, the seat warmer has…
• 11013787Jan 21, 2025Other or unknown. When performing the MGSS Workshop Manual 360° View Monitor System Aiming Procedure, M-MDS may show error message "Procedure unsuccessful". This may be caused by light glare on the SST.
• 11013657Jan 15, 2025Electrical system. Some customers may experience that the out-of-area (reception area) type auto lock function sometimes fails. When the front door is being closed with a hand touching one or both of the touch sensors on the front outer handle, the out-of-area (reception area) type auto lock function may fail. Control software of the LF control unit (LFU) has been modified.
• 11012344Dec 24, 2024Engine. Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) to extend the warranty coverage for a specific repair of the fail-safe thermostat installed inside of the suspected coolant control valve on certain 2018-2025 CX-5, 2019-2023 Mazda3, 2019-2022 CX-3, 2018-2021 Mazda6 and 2020-2023 CX-30 vehicles.
• 11012345Dec 6, 2024Other or unknown, Electrical system, Engine. Frequently Asked Questions (FAQ)
• 11011139Nov 26, 2024Air bags. A customer may complain of a rattle noise from the right side of the dash. The noise may be coming from the passenger side airbag.
• 11011341Nov 18, 2024Engine, Fuel system. CUSTOMER SERVICE PROGRAM CSP12 - DENSO LOW-PRESSURE FUEL PUMP CUSTOMER SERVICE PROGRAM WARRANTY EXTENSION: Attention ALL Mazda Dealers: This is a Warranty Extension and not a recall campaign. Repairs are not to be made unless there is a confirmed low-pressure fuel pump failure within the coverage period. As of November 18, 2024 Repair Procedures and Parts and Warranty documents are available.
• 11011338Nov 18, 2024Fuel system, Engine. CUSTOMER SERVICE PROGRAM CSP12 - DENSO LOW-PRESSURE FUEL PUMP CUSTOMER SERVICE PROGRAM WARRANTY EXTENSION: Attention ALL Mazda Dealers: This is a Warranty Extension and not a recall campaign. Repairs are not to be made unless there is a confirmed low-pressure fuel pump failure within the coverage period. As of November 18, 2024 Repair Procedures and Parts and Warranty documents are available.
• 11011336Nov 18, 2024Fuel system, Engine. CUSTOMER SERVICE PROGRAM CSP12 - DENSO LOW-PRESSURE FUEL PUMP CUSTOMER SERVICE PROGRAM WARRANTY EXTENSION: Attention ALL Mazda Dealers: This is a Warranty Extension and not a recall campaign. Repairs are not to be made unless there is a confirmed low-pressure fuel pump failure within the coverage period. As of November 18, 2024 Repair Procedures and Parts and Warranty documents are available.
• 11011138Nov 15, 2024Other or unknown. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App Connected Vehicle enrollment. 2. Remote function(s) inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
• 11010992Nov 13, 2024Electrical system. Some customers may experience rear subwoofer audio sound pauses intermittently at high volume levels. When the volume level is lowered, the subwoofer audio sound resumes. The actual volume level may vary depending on the audio source. If the audio source consists of many low frequency (40 - 70 Hz) sounds, the concern may occur at volume level 35 or higher. This concern may be caused by improper audio amplifier…
• 11011331Nov 12, 2024Engine, Fuel system. CUSTOMER SERVICE PROGRAM CSP12 - DENSO LOW-PRESSURE FUEL PUMP CUSTOMER SERVICE PROGRAM WARRANTY EXTENSION: Attention ALL Mazda Dealers: This is a Warranty Extension and not a recall campaign. Repairs are not to be made unless there is a confirmed low-pressure fuel pump failure within the coverage period. As of November 18, 2024 Repair Procedures and Parts and Warranty documents are available.
• 11011137Nov 9, 2024Engine. On certain subject vehicles, the check engine light is illuminated with diagnostic trouble code (DTC) P0126, due to the fail-safe thermostat being stuck open. Additionally, you may notice one or more of the following symptoms: -Engine takes longer to warm up. -Engine temperature gauge fluctuates. -Low coolant temperature indicator (blue) light stays on longer or turns on while driving. -Poor heater performance…
• 11011345Nov 8, 2024Engine, Fuel system. CUSTOMER SERVICE PROGRAM CSP12 - DENSO LOW-PRESSURE FUEL PUMP CUSTOMER SERVICE PROGRAM WARRANTY EXTENSION: Attention ALL Mazda Dealers: This is a Warranty Extension and not a recall campaign. Repairs are not to be made unless there is a confirmed low-pressure fuel pump failure within the coverage period. As of November 18, 2024 Repair Procedures and Parts and Warranty documents are available.
• 11011326Nov 8, 2024Fuel system, Engine. CUSTOMER SERVICE PROGRAM CSP12 - DENSO LOW-PRESSURE FUEL PUMP CUSTOMER SERVICE PROGRAM WARRANTY EXTENSION: Attention ALL Mazda Dealers: This is a Warranty Extension and not a recall campaign. Repairs are not to be made unless there is a confirmed low-pressure fuel pump failure within the coverage period. As of November 18, 2024 Repair Procedures and Parts and Warranty documents are available.
• 11011141Nov 8, 2024Other or unknown. Some customers may report concerns with interior upholstery surface stains particularly on high contact areas (e.g.: seats, steering wheel, door panels, shifter...etc.). This may be caused by skin oils or chemicals such as hand lotions.
• 11011140Nov 5, 2024Electrical system. When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to activate the new TCU after replacement. Use the information in this service alert to initialize the new TCU until the procedure on MGSS is updated.
• 11011133Nov 5, 2024Engine. Some customers may experience a check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: Engine takes longer to warm up. Engine temperature gauge fluctuates. Low coolant temperature indicator (blue) light stays on longer or turns on while driving. Poor heater performance, especially at idle.
• 11009665Oct 31, 2024Engine. Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) to extend the warranty coverage for a specific repair of the fail-safe thermostat in the coolant control valve on certain CX-5, Mazda3, CX-3, Mazda6 and CX-30 vehicles that are equipped with the suspected coolant control valve.
• 11009664Oct 31, 2024Engine. Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) to extend the warranty coverage for a specific repair of the fail-safe thermostat in the coolant control valve on certain CX-5, Mazda3, CX-3, Mazda6 and CX-30 vehicles that are equipped with the suspected coolant control valve.
• 11009654Oct 24, 2024Transmission and drivetrain. The SKYACTIV-DRIVE FW6A-EL AT uses “Automatic Transmission Fluid (ATF) Type: FZ”. Only use “ATF-FZ” to fill or top off the fluid level. ATF-FZ is specially designed for use in the SKYACTIV-DRIVE series AT. It is a low viscosity formula with less friction for better fuel economy. NOTE: ATF-FZ is colored blue for easy identification.
• 11009663Oct 22, 2024Engine. SPECIAL SERVICE PROGRAM - SSPD5 - WARRANTY EXTENSION - MULTI-MODEL - VALVE STEM SEALS CLASS ACTION In conjunction with a Class Action Settlement, Mazda Motor Corporation has decided to conduct an extension of the Engine powertrain warranty related to excessive oil consumption.
• 11009644Oct 5, 2024Brakes. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern.
• 11009636Oct 3, 2024Other or unknown. Some vehicles may exhibit a rear console lid with a sticking feeling or a squeaking noise when opening and/or closing. This is caused by an inappropriate shape of the console lid hinge pin where the position of the hinge pin (1) becomes misaligned when the rear console lid is repeatedly opened and closed. When parts around the hinge pin thermally expand, the result creates a gap in the hinge of the rear console lid.
• 11009635Oct 3, 2024Other or unknown. Some customers may complain that the rear console lid does not slide smoothly. This may be caused by improperly positioned felt pads attached to the rear console lid lock, which may have moved out of position after repetitive use. The exposed adhesive residue may stick to the rail and disrupt smooth sliding operation.
• 11009647Oct 2, 2024Engine. A new cylinder head assembly for service parts has been newly established for SKYACTIV-G 2.5 with cylinder deactivation when replacement is needed. Valves, valve springs, valve spring seats, and cotters (IN/EX) are included in the new assembly. Hotline and MASH authorization is not required to order parts for performing this repair. If there are any questions on part ordering or part status, contact the Dealer…
• 11008430Sep 26, 2024Brakes. This information will give you the necessary knowledge to respond to customers concerns of Smart Brake Support (SBS) unintended braking. By educating the customer on the system operation, it should reduce their anxiety or distrust of the vehicle.
• 11008568Sep 25, 2024Electrical system. Some customers may experience a “Telematics Malfunction” message in the instrument cluster with DTC U3000:00-TCU (Emergency call unit/telematics communication unit internal malfunction) or U3000:04-TCU (Telematics communication unit internal malfunction) stored in memory. This is caused by improper control software of the telematics communication unit (TCU). To eliminate this concern, the control software of the…
• 11008580Sep 24, 2024Electrical system. Mazda Connect Services - Frequently Asked Questions (FAQ)
• 11008574Sep 24, 2024Other or unknown, Electrical system. Some customers may experience a Connected Vehicle failure. The MyMazda App may display an Error Code. This document provides Error Code description and recovery information to assist with repairs.
• 11008578Sep 13, 2024Electrical system. When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to activate the new TCU after replacement. Use the information in this service alert to initialize the new TCU until the procedure on MGSS is updated.

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