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Service bulletins for the 2021 Mazda Mazda3

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.

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

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Bulletins, newest first
SA-013-21d2021-05-04. Service bulletin. ELECTRICAL SYSTEM. IMPORTANT NOTE: Some 2020 Mazda3 vehicles may have incorrect infotainment software version 10042 installed. The incorrect software will cause MyMazda App Connected Vehicle enrollment errors. Go to SSPC1. Some customers may complain about any of the following: Infotainment Center Display does not provide the Authorization Code during the MyMazda App Connected Vehicle enrollment (and Software Update Error message on 2020 Mazda3 only). Remote function(s) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
SA-029-212021-05-04. Service bulletin. EQUIPMENT. APPLE CARPLAY / ANDRID AURO FREQUENTLY ASKED QUESTIONS (FAQ) The following vehicles are not equipped with Apple CarPlay™ / Android Auto™, but it can be activated using MDARS. See Activation instructions on MGSS -> Infotainment -> MAZDA CONNECT Updates -> Apple Carplay / Android Auto MDARS Activation Instructions
SA-003-21a2021-05-04. Service bulletin. EQUIPMENT. Some customers may complain about the following symptoms occurring when driving without anything ahead (no metallic object reflects the radar wave such as a vehicle ahead, an oncoming vehicle, a road sign or a guard rail). While using Mazda Radar Cruise Control (MRCC), the MRCC cancels by itself. When MRCC is not in use, Safety and Driver Support Systems Temporarily Disabled. Front Radar Obscured. message appears in the instrument cluster / Remove dirt on the front radar sensor message appears in the center display and related i-ACTIVSENSE functions stop working.
09-012-21-38012021-05-04. Service bulletin. ELECTRICAL SYSTEM. Some customers may experience all of following symptoms: The door lock/unlock operation will not work using the remote transmitter button. The door lock/unlock operation will not work using the door lock/release touch sensor. The engine will not start using the ignition switch. This is caused when excess load is applied to the remote transmitter and the electrical terminals in it may be deformed, causing poor contact with the battery. To eliminate this concern, the structure in the remote transmitter has been modified to reduce the deformation of the electrical terminals.
01-004-21-3773a2021-05-04. Service bulletin. ENGINE AND ENGINE COOLING. Some vehicles may have the check engine light on with DTC P0524:00 or P055F:00 stored in memory. Contamination in the engine oil may cause the engine oil solenoid valve to become stuck, resulting in improper operation of the oil pump and improper oil pressure. DTC P0524:00 (Engine oil pressure too low), DTC P055F:00 (Engine oil pressure malfunction). The control software of the PCM has been modified to eliminate this concern. In addition, the production process has been modified to reduce contamination in the engine oil solenoid valve, oil pump, spacer and oil filter.
01-002-21-3767a2021-05-04. Service bulletin. ENGINE AND ENGINE COOLING. Some vehicle may exhibit a tapping noise from the engine during idling; etc., and synchronized to the engine rpm. The tapping noise may be caused by the switchable hydraulic lash adjuster (HLA), which may not work properly due to air bubbles accumulated in the oil passage in it. To eliminate this concern, the switchable HLA has been modified for increased oil supply to reduce air bubbles in the oil passage. NOTE: The switchable HLA can be pressed down with a finger if air bubbles have accumulated in it.
SA-012-21d2021-04-26. Service bulletin. EQUIPMENT. MAZDA CONNECTED SERVICES - FREQUENTLY ASKED QUESTIONS (FAQ): Index: General Questions, Setup and Getting Started, Registration / Enrollment, WI-FI General Information, WI-FI How-To, WI-FI Trial Period, Interacting With The App, Service Issues, Troubleshooting, Reception Level Inspection, Dealer Processes, Conditions for Remote Engine Start Will Not Function, Conditions for Remote Engine Start Function Will turn engine OFF, Educational Videos, Resources
SA-014-21c2021-04-26. Service bulletin. EQUIPMENT. Some customers may complain about an infotainment reboot and the infotainment system recovers if the Navigation SD card is removed (see attached video). NOTE: This concern may be present on a 2019-2020 Mazda3 or a 2020 CX-30 after the customer updates the Navigation SD card map software using Mazda Toolbox.
SA-028-212021-04-26. Service bulletin. FORWARD COLLISION AVOIDANCE. If driving on roads with few vehicles or obstructions ahead for the front radar sensor to detect, and a Safety and Driver Support Systems Temporarily Disabled. Front Radar Obscured. Drive Safely message is temporarily displayed, this does not necessarily indicate a problem. The radar sensor may simply need to be cleaned to eliminate the warning message.
SA-027-212021-04-26. Service bulletin. EQUIPMENT. MAZDA CONNECT Symptom Troubleshooting (7th Generation Vehicles). Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure
SA-026-212021-04-26. Service bulletin. VISIBILITY. 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). If the power window is fully closed before the 10th time, the counting restarts and the AUTO function is not deactivated.
15-001-21-37952021-04-26. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Some customers may notice an unexpected collision warning or automatic braking while reversing. This concern may be due to the parking assist unit software. The Smart Brake Support (SBS-R) system may be detecting an unintended obstruction at the lower rear end of the vehicle. To eliminate this concern, the parking assist unit control software has been modified.
01-009-21-37992021-04-26. Service bulletin. POWER TRAIN. Some vehicles may exhibit that the active air shutter is working, but DTC P05A0:00 (Active air shutter: Opening angle abnormality (sticking)) is stored in memory. This is caused by improper control software of the PCM detecting the DTC immediately without performing the failsafe operation. When the active air shutter detects unusual torque, it is designed to repeat the open/close cycles up to three times as a failsafe to try to remove the objects which temporarily disturbed the movement. To correct this concern, the control software of the PCM has been modified.
DRW382021-04-06. Service bulletin. STRUCTURE; EQUIPMENT. DRW38 - RESIDUE OR STAIN BY WRAPGUARD ON BELTLINE - On the subject vehicles shipped from MC on January 8, 2021, added wrap guard was temporarily attached on the beltline molding (both left and right) to protect the beltline molding from misty seawater (for rust prevention). The wrap guard was to be removed prior to shipment. The affected vehicles need to have the wrap guard removed and then inspect the beltline molding for any signs of adhesive residue or possible rust spots.
SA-013-21c2021-04-06. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE. IMPORTANT NOTE: Some 2020 Mazda3 vehicles may have incorrect infotainment software version 10042 installed. The incorrect software will cause MyMazda App Connected Vehicle enrollment errors. Go to SSPC1. Some customers may complain about any of the following: Infotainment Center Display does not provide the Authorization Code during the MyMazda App, Connected Vehicle enrollment (and Software Update Error message on 2020 Mazda3 only). Remote function(s) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
SA-012-21c2021-04-06. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT ADAPTIVE/MOBILITY. MAZDA CONNECTED SERVICES - FREQUENTLY ASKED QUESTIONS (FAQ): Index: General Questions, Setup and Getting Started, Registration / Enrollment, WI-FI General Information, WI-FI How-To, WI-FI Trial Period, Interacting With The App, Service Issues, Troubleshooting, Reception Level Inspection, Dealer Processes, Conditions for Remote Engine Start Will Not Function, Conditions for Remote Engine Start Function Will turn engine OFF, Educational Videos, Resources
SA-023-212021-04-06. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT. Some customers may complain about any of the following: Warning light, Warning message, Headlight(s) inoperative, Cannot shift out of Park, Many DTC's stored, Module communication errors
SA-022-212021-04-06. Service bulletin. ELECTRICAL SYSTEM:ADAS:HUD:CAMERA/SENSOR; EQUIPMENT ADAPTIVE/MOBILITY; VISIBILITY. 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.
SA-020-212021-04-05. Service bulletin. ELECTRICAL 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.
SA-014-21b2021-04-05. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Some customers may complaint about an infotainment reboot. The infotainment system recovers if the Navigation SD card is removed (see attached video).
SA-005-21c2021-04-05. Service bulletin. ELECTRICAL SYSTEM. Some vehicles may have a "Low Battery Risk. Start Vehicle to Charge 12V Battery" warning message in the instrument cluster and a 30 second alarm sound. This is caused by the vehicle's electrical control area network (CAN) entering "Sleep Mode" when the network awake time reaches 30 cumulative minutes without the engine running.
MT-001-212021-04-05. Service bulletin. 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 Workshop Manual diagnosis. Aftermarket devices may be the cause of the electrical concern. Ask the customer if any aftermarket devices have been installed.
SSPC52021-03-03. Service bulletin. EQUIPMENT; LATCHES/LOCKS/LINKAGES; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Mazda Motor Corporation has decided to conduct a Special Service Program impacting certain 2019-2021 Mazda3 and 2020-2021 CX-30 vehicles built at MC and MMVO. Please see the descriptions, models, years, and VIN Ranges below. NOTE: A new MDRT Tool will be sent to all dealers, please read the attached MDRT Tool document arriving with this email. NOTE: The subject vehicles are affected by one, two or three concerns depending on production date, (Battery Drain, and/or MRCC and/or Theft-deterrent system). Some of the subject vehicles are also affected by SSPC4 and Safety Recall 4621B which officially addresses radio static noise from speakers, and/or rear hatch may fall when parked on an incline.
SA-005-21a2021-03-03. Service bulletin. ELECTRICAL SYSTEM. Some vehicles may have a "Low Battery Risk. Start Vehicle to Charge 12V Battery" warning message in the instrument cluster and a 30 second alarm sound. This is caused by the vehicle's electrical control area network (CAN) entering "Sleep Mode" when the network awake time reaches 30 cumulative minutes without the engine running.
SA-012-21a2021-03-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING. MAZDA CONNECTED SERVICES - FREQUENTLY ASKED QUESTIONS (FAQ): Index: General Questions, Setup and Getting Started, Registration / Enrollment, WI-FI General Information, WI-FI How-To, WI-FI Trial Period, Interacting With The App, Service Issues, Troubleshooting, Reception Level Inspection, Dealer Processes, Conditions for Remote Engine Start Will Not Function, Conditions for Remote Engine Start Function Will turn engine OFF, Educational Videos, Resources

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