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.

• 10244562Oct 19, 2023Body and structure. Some vehicles may have a water leak and/or a technician may find water inside the cabin or within a component. The source of the leak may be from between the doors at the B-pillar. To correct this concern, there was a mass production change (MPC) on January 14, 2021 to reduce the gap (as seen in the image below).
• 10244679Oct 11, 2023Equipment, Engine cooling, Electrical system. If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices.
• 10244661Oct 10, 2023Visibility (wipers, defrost, mirrors), Electrical system. When the power windows are operated many times without being fully closed, small errors of the window position sensor may accumulate and cause improper operation of the jam-safe function. To reduce the risk of this occurrence, the AUTO function is disabled if the power window is operated 10 consecutive times without being fully closed (turning the ignition OFF and then ON does not reset the counting).
• 10244665Oct 6, 2023Equipment. Some customers may complain about the Active Driving Display not displaying turn by turn (TBT) travel direction or navigation information.
• 10244670Oct 3, 2023Engine cooling, Transmission and drivetrain. Some customers may complain about engine surging 100-200 rpm when accelerating up a hill at altitudes around 6,700 feet or higher. This concern may be caused by improper PCM control software in particular situations. To eliminate this concern, the PCM control software has been modified.
• 10243552Sep 26, 2023Body and structure. Some vehicles may exhibit that the glass run channel of the front door interferes with the rear door garnish. Since the front door glass run channel is not fixed to the door strongly enough for the following situations, cycles of door operation may result in interference and lead to damage on the seal rubber at the rear door. When the front door glass is closed, the glass run channel may be forced to move to the B…
• 10243568Sep 15, 2023Brakes. 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.
• 10243546Sep 15, 2023Brakes. Symptom 1: Some customers may complain about hearing a grinding noise and/or vibration occur when applying the brake. This is due to rust on the rear brake disc plate. Symptom 2: Some vehicles may exhibit a squeal noise from the rear brakes when braking lightly while driving at a slow speed. The squeal noise is caused by the disk pad surface fluctuating.
• 10243559Sep 14, 2023Equipment. MNAO has recently found an increase in non-returned cores within the United Radio (UR) exchange program. As a reminder, dealers have 90 days, after the order is placed, to return the exchanged part. Failure to return the exchanged part will result in a debit of the full component price.
• 10243569Sep 13, 2023Body and structure, Visibility (wipers, defrost, mirrors). Some vehicles may experience exterior trim heat damage when parked near a glass building or Low-E windows. This may be caused by the sun's reflection.
• 10241637Aug 28, 2023Electrical system. Some customers may complain about scratches on the instrument cluster lens.
• 10241636Aug 28, 2023Electrical system. Qi Wireless Charger Symptom Troubleshooting
• 10241635Aug 28, 2023Electrical system. Qi Wireless Charger Symptom Troubleshooting
• 10241634Aug 28, 2023Exterior lighting, Engine cooling, Equipment. 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
• 10241632Aug 28, 2023Equipment. Some customers may experience infotainment door rattle noise. Follow the repair procedure to help determine the cause.
• 10241631Aug 28, 2023Equipment. Some customers may experience an infotainment sub-woofer rattle noise. Follow the repair procedure to help determine the cause.
• 10241607Aug 17, 2023Transmission and drivetrain, Engine cooling. Some customers may complain about engine surging 100-200 rpm when accelerating up a hill at altitudes around 6,700 feet or higher. This concern may be caused by improper PCM control software in particular situations.
• 10241612Aug 16, 2023Engine cooling. 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. Dealers can now utilize the Limited Parts Ordering (LPO) page on eMDCS to order the repair parts for 2.5L (with cylinder deactivation) and 2.5L turbo cylinder head repairs.
• 10241633Aug 15, 2023Engine cooling, Equipment, Exterior lighting. 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
• 10241610Aug 3, 2023Electrical system. Some vehicles may exhibit the warning message "Ultrasonic Sensor Malfunction" in the instrument cluster and the following DTC(s) stored after replacing the front and/or rear ultrasonic sensor(s) during body or paint repair.
• 10240372Jul 26, 2023Air bags. Some vehicles may exhibit that the air bag warning light turns on or repeats cycles of turning on and off with DTC B1126:13 and/or B1127:13 stored in memory.
• 10240424Jul 25, 2023Electrical system, Equipment. Updated software release for concerns with MAZDA CONNECT infotainment system. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Ver. 7000C0A-NA01_12006 or later).
• 10240419Jul 25, 2023Equipment, Electrical system. Updated software release for concerns with MAZDA CONNECT infotainment system. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Ver. 7000C0A-NA04_12006 or later).
• 10240417Jul 25, 2023Equipment, Electrical system. Updated software release for concerns with MAZDA CONNECT infotainment system. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Ver. 7000C0A-NA06_12018 or later).
• 10240494Jul 21, 2023Equipment. Some customers may complain about the Active Driving Display not displaying turn by turn (TBT) travel direction or navigation information.
• 10240408Jul 18, 2023Visibility (wipers, defrost, mirrors), Electrical system. Some customers may experience “Ultrasonic sensor malfunction” warning message displayed in the instrument cluster when driving or at a stop. The warning message continues until the ignition is turned off. Upon inspection, one or more of following DTC are detected in the parking assist unit (ultrasonic).
• 10240385Jul 13, 2023Visibility (wipers, defrost, mirrors), Body and structure. Some vehicles may experience white-streak stains appearing on the front door that look like they seeped out from under the outer mirror base. This is caused by water intruding from gaps of the outer mirror body and/or the hinge of the outer mirror, and corrosion occurring on the aluminum die-cast inner base in the outer mirror. Water, including white-salty corrosion, may drip out from gaps under the outer mirror…
• 10240495Jul 11, 2023Electrical system. Some customers may experience the following: In-Vehicle Network Malfunction error message, Master Warning light ON, Connected Vehicle Reception Icon shows "X".
• 10240403Jul 10, 2023Electrical system, Latches, locks and linkages. Some customers may experience one or both of the following symptoms while locking and unlocking the doors works fine using the remote transmitter. Symptom 1: The touch sensor of the front door outer handle does not lock the doors after rain and/or car washing, even though unlocking is possible. Symptom 2: The touch sensor of the front door outer handle does not unlock the doors.
• 10240373Jul 10, 2023Electrical system, Seats. 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 been…
• 10240399Jul 7, 2023Equipment. 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.
• 10240496Jul 6, 2023Body and structure. Some vehicles may experience exterior trim heat damage when parked near a glass building or Low-E windows. This may be caused by the sun's reflection.
• 10240484Jul 5, 2023Exterior lighting, Equipment, Engine cooling, Latches, locks and linkages. 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 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
• 10238689Jun 28, 2023Equipment, Engine cooling. Connected Services, Frequently Asked Questions (FAQ)
• 10238671Jun 23, 2023Visibility (wipers, defrost, mirrors). Some customers may complain that the frequency of replenishing the window washer liquid is higher than expected, or they may complain of leakage at or around the washer motor (1). This is caused by a crack that may occur at the joint section of the washer motor housing due to an inappropriate assembly process. To eliminate this concern, the design of the washer motor has been modified to not have a joint section.
• 10238692Jun 13, 2023Electrical system, Equipment. In-vehicle network malfunction and master warning light on. Dtc u3000:04 stored (does not apply to 09-001/23)
• 10238680Jun 13, 2023Wheels, Tires. Some vehicles may exhibit a steering shimmy or body vibration during the PDI test drive or during the first few miles of driving after the vehicle has been delivered to the customer due to flat spots on the tires. Flat spots on tires may be caused by improper maintenance during dealer storage (e.g.: Vehicle was left stationary for a prolonged period of time in high ambient temperatures).
• 10238681Jun 12, 2023Latches, locks and linkages, Engine cooling, Body and structure, Exterior…. 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 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
• 10238670Jun 12, 2023Electrical system, Latches, locks and linkages. 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.
• 10238700Jun 6, 2023Engine cooling. 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. Dealers can now utilize the Limited Parts Ordering (LPO) page on eMDCS to order the repair parts for 2.5L (with cylinder deactivation) and 2.5L turbo cylinder head repairs.
• 10238697Jun 5, 2023Body and structure, Equipment. Interior parts made of resin have antistatic coating to prevent dust from sticking on the surfaces, and depending on the conditions of use, the antistatic components may crystallize slightly, giving an appearance of white stains on the surface. To remove the stains, wipe the stained surface with a towel soaked with water mixed with a small portion of a neutral detergent. If the white stains reappear again, simply…
• 10238668Jun 1, 2023Seats. At PDI or when new vehicle is delivered, some customers may complain about wrinkles on the leather seat cushion and/or seat back surface.
• 10237208May 31, 2023Electrical system, Equipment. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
• 10237216May 24, 2023Electrical system, Engine cooling. If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices.
• 10237210May 24, 2023Engine cooling, Electrical system, Equipment. Frequently Asked Questions (FAQ)
• 10237209May 24, 2023Equipment, Engine cooling, Electrical system. 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, 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
• 10237206May 23, 2023Equipment, Electrical system. Some customers may complain that Mazda Connect does not start (blank screen) or that it takes a long time to restart/ reboot after starting the vehicle. This is caused by the initialization process with the CMU failing at startup due to a defective circuit board element. To eliminate this concern, the internal hardware (DRAM) of the CMU has been improved.
• 10237215May 17, 2023Wheels. Some automotive cleaning products contain strong acid or alkali. When these types of cleaners are used to clean the wheels on Mazda vehicles, the chemicals contents penetrate the clear coating of the wheel surface and damage the paint under the clear coating. The damaged area has the appearance of dark stains or discoloration.
• 10237201May 17, 2023Air bags. Some vehicles may exhibit that the air bag warning light turns on or repeats cycles of turning on and off with DTC B1126:13 and/or B1127:13 stored in memory.
• 10237203May 9, 2023Body and structure, Visibility (wipers, defrost, mirrors). Some vehicles may experience a gap between the glass and the rear door glass run-channel due to run-channel deformation. This causes poor appearance and wind noise when driving at high speed. This concern is due to the incorrect shape of the glass run-channel.

← All problems reported for the 2021 Mazda MAZDA3