2025 Mazda MAZDA3 Technical Service Bulletins

153 technical service bulletins (TSBs) are on record for the 2025 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.

• 11037636Oct 1, 2026Engine. NOTE: This service information only applies to vehicles with PYUKD engine and EGR. DESCRIPTION DTC P0402 EGR malfunctions may be falsely detected due to an internal malfunction of the MAP sensor. REPAIR PROCEDURE 1. Using MDARS, verify DTC P0402 is set in current or past history.
• 11037632Sep 18, 2026Electrical system. DESCRIPTION Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. Connected Vehicle Remote functions may fail. The following DTC's may be stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) U0198:00-03:CMU - COMMUNICATION ERROR WITH…
• 11037900Sep 17, 2026Other or unknown, Electrical system. Mazda Connected Services - Frequently Asked Questions (FAQ) This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text.
• 11037899Sep 11, 2026Electrical system. DESCRIPTION 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. Examples: 1. Devices…
• 11037634Sep 10, 2026Other or unknown, Electrical system. This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-038/26 08/18/26 and 06/15/26 DESCRIPTION Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App
• 11037018Sep 4, 2026Other or unknown, Engine, Exterior lighting, Electrical system. This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-038/26 06/15/26 DESCRIPTION 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 functions inoperative. Engine Start / Stop Door Lock / Unlock Lights ON /…
• 11037627Sep 3, 2026Body and structure. This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text. 09-043/25 11/26/2025 DESCRIPTION Some vehicles may experience a clicking noise when opening and/or closing the front door due to a broken front door checker plate. To reduce the clicking noise, the material of the plastic component in the door checker has been modified. REPAIR PROCEDURE 1. Verify the customer…
• 11037019Aug 19, 2026Other or unknown, Electrical system. This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red text. SA-039/26 06/15/26 Mazda Connect Symptom Troubleshooting DESCRIPTION Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
• 11037011Aug 19, 2026Electrical system, Wheels. This Service Alert supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text. SA-006/23 01/23/23 DESCRIPTION Some customers may complain about the infotainment system and/or the MyMazda App showing incorrect clock and/or tire pressures and/or tire pressure missing. This may be caused by: Incorrect calendar entry (month/day/year) after a battery disconnect Infotainment system…
• 11037017Aug 7, 2026Electrical system, Other or unknown. This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-012/26 04/17/26, 03/04/26 and 02/26/2026 DESCRIPTION Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. Connected Vehicle Remote functions may fail.
• 11037008Aug 7, 2026Electrical system, Other or unknown. DESCRIPTION Some vehicles may continue to display the recall notification "IMPORTANT NOTICE. VIEW VEHICLE STATUS MONITOR FOR DETAILS" on the center display even after the recall has been completed. NOTE: Once the warranty claim for the recall campaign is approved by Mazda Japan, the recall notification will be automatically removed via Connected Services on the following day or later.
• 11037006Aug 6, 2026Engine. Some vehicle may exhibit the CHECK ENGINE light on with DTC P0524 (Engine oil pressure control system: Oil pressure decrease) and no abnormal engine noise. This may be caused by a malfunction of the oil pressure control valve (located at the rear of the engine block near the oil filter) due to machining contamination inside the electromagnet sleeve and the solenoid plunger remaining during manufacturing.
• 11035595Jul 8, 2026Steering, Electrical system. DESCRIPTION Some customers may complain that the electric power steering warning light illuminates after engine start and DTC U2011:1C is stored. Zinc-plated whisker may form inside the EPS motor and trigger the DTC. However, since it is cleared when power is supplied during DTC detection, normal operation can be restored by turning the ignition OFF and then ON. Furthermore, there is no possibility of recurrence.
• 11035606Jul 2, 2026Visibility (wipers, defrost, mirrors). This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-063/24 09/06/24 DESCRIPTION The Blind Spot Monitoring (BSM) system can malfunction with the following symptoms if the rear side radar sensors are installed facing the wrong direction.
• 11034448Jul 1, 2026Electrical system, Other or unknown, Engine. This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text. SA-017/25 12/16/25, 09/08/25, 07/14/25, 05/15/25 and 03/21/25 DESCRIPTION Mazda Connect Frequently Asked Questions (FAQ) Index General Questions MAZDA CONNECT Indication Setup and Getting Started Dealer Processes Registration / Enrollment / Take-Over Customer Subscription Status WI-FI General Informatio Opening…
• 11034292Jul 1, 2026Other or unknown, Electrical system. COMPLIANCE WITH NEW YORK STATE GENERAL BUSINESS LAW §399‑CCCCC (CONNECTED VEHICLE SERVICE; DOMESTIC VIOLENCE VICTIMS) DESCRIPTION This Service Information is issued in accordance with New York State General Business Law §399􀀀CCCCC (Connected Vehicle Service; Domestic Violence Victims).
• 11034290Jun 30, 2026Electrical system, Other or unknown. UPDATED SOFTWARE RELEASE FOR CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM DESCRIPTION The release notes outlined below provide an overview of bug fixes, feature improvements, and updates included in the latest software release. The latest version of software contains all the updates of the previous versions. NOTE: If current version is not 7230C**-NA10_*****, this TSB is not applicable.
• 11034447Jun 19, 2026Electrical system, Engine. This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION 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.
• 11034439Jun 17, 2026Electrical system. This SA supersedes the previously issued bulletin(s) listed below. The changes are noted below in Red. SA-027/26 04/16/26 DESCRIPTION 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…
• 11034845Jun 16, 2026Electrical system. DESCRIPTION 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 " ".
• 11034444Jun 16, 2026Electrical system, Other or unknown. This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-009/25 08/22/25 and 02/18/25 DESCRIPTION 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. Index System Outline • MYMAZDA App Connected Vehicle (CV) Error Codes •…
• 11034443Jun 16, 2026Electrical system, Other or unknown. This Service Alert supersedes the previously issued SA listed below. The changes are noted in Red text. SA-012/25 10/06/25, 08/21/25, 05/15/25 and 02/27/25 DESCRIPTION Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure. REPAIR PROCEDURE NOTE: Before proceeding: Document the vehicle's current MAZDA CONNECT CMU software version. • 2019-2022 Models - Go to…
• 11033446Jun 4, 2026Electrical system. This SA supersedes the previously issued SA(s) listed below. The changes are noted below in Red. SA-029/25 10/16/25 and 06/02/25 DESCRIPTION This service information provides testing and charging procedures in order to promote proper battery maintenance, to deliver new vehicles with fully charged batteries, and to reduce unnecessary battery replacement cost. For new vehicles in stock at the dealer, inspect and…
• 11033447May 19, 2026Electrical system, Other or unknown. This service alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-047/25 10/07/25 DESCRIPTION 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. CAUTION: DO NOT swap TCU with…
• 11033445May 2, 2026Fuel system. This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-011/25 10/16/25 and 02/27/25 DESCRIPTION Some customers will report that their fuel door (AKA, fuel filler door, fuel lid, and fuel-filler lid) 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…
• 11032001May 1, 2026Transmission and drivetrain. This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text. 01-003/26 01/30/26 Some vehicles may exhibit a check engine light ON with DTC P20F8:00 stored. P20F8:00 - Swirl control circuit range/performance problem. In these cases, increasing temperature levels of the Swirl Control Valve (SCV) motor due to excessive actuation leads to duty limitation, causing poor…
• 11032104Apr 30, 2026Other or unknown, Body and structure. DESCRIPTION Some vehicles may require the replacement of a damaged VIN plate or vehicle certification label. To obtain a replacement VIN plate (bulkhead-mounted and visible through the lower-left area of the windshield), contact DAG (Dealer Assistance Group) using VIN Plate Request Form available on One Mazda. To obtain a replacement vehicle certification label (located on the B􀀀pillar or front door), contact your…
• 11032103Apr 21, 2026Brakes, Transmission and drivetrain, Engine, Other or unknown. This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all major vehicle systems. Mazda recommends dealers follow the scheduled maintenance tables as cited in the vehicle-specific workshop manual or owner's manual. Services performed…
• 11032015Apr 18, 2026Other or unknown, Electrical system. Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. • Connected Vehicle Remote functions may fail. • The following DTC's may be stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) • U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL…
• 11032101Apr 16, 2026Engine. This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-002/19 09/30/19 and 12/19/19 DESCRIPTION If an engine assembly is replaced after a catastrophic internal mechanical failure, clean the intake manifold internally before installing a replacement engine assembly. If the intake manifold is not cleaned properly, the replacement engine may fail prematurely.
• 11032102Apr 15, 2026Electrical system. This SA supersedes the previously issued bulletin(s) listed below. The changes are noted below in Red. SA-007/25 10/22/25, 06/02/25 and 02/03/25 DESCRIPTION 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…
• 11030647Mar 20, 2026Other or unknown, Body and structure. This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-045/22 12/06/22 and 07/12/22 NOTE: All vehicles with protective films applied to the piano black door garnishes of the following models are applicable to this Service Alert. DESCRIPTION The purpose of this Service Alert is to remind dealers to keep the protective films on the piano black door garnishes attached until just…
• 11030636Mar 11, 2026Engine. This Service Alert supersedes the previously issued SA(s) and TSB(s) listed below: The changes are noted in Red. SA-035/24 05/31/24 DESCRIPTION There is a concern that some water pumps are being replaced that are not faulty, due to signs of a very small coolant leak from the bleed hole. This Service Alert is to inform you about the water pump sealing mechanism and the criteria if replacement is necessary or not. A…
• 11030631Mar 4, 2026Other or unknown, Electrical system. This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-012/26 02/26/2026 DESCRIPTION Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. Connected Vehicle Remote functions may fail.
• 11029531Feb 27, 2026Other or unknown, Electrical system. This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-060/25 12/16/25 Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. Connected Vehicle Remote functions may fail.
• 11028102Jan 31, 2026Engine. Some vehicles may exhibit a check engine light ON with DTC P20F8:00 stored. P20F8:00 - Swirl control circuit range/performance problem. • The DTC is caused by overheating of the Swirl Control Valve (SCV) motor which leads to duty limitation, causing poor opening􀀀angle response and resulting in stuck judgment. To eliminate this concern, the PCM control software has been modified.
• 11028142Jan 30, 2026Engine. SSPD8 - Check Engine Light ON with DTC P0126:00 - WARRANTY EXTENSION For certain 2018-2025MY CX-5, 2019-2023MY Mazda3, 2019-2022MY CX-3, 2018-2021MY Mazda6, 2020-2023MY CX-30 that are equipped with the suspected coolant control valve, the warranty coverage for specific repair of the fail-safe thermostat is extended to: 15 years (180 months) or 150,000 miles (240,000 km) whichever comes first, from the original…
• 11028133Jan 26, 2026Other or unknown. There are currently 2 methods for cutting a new auxiliary key blank. A. Auxiliary Key Trace Cut Method • B. Auxiliary Key Code Cut Method 2019 and newer models require a 10-digit key code to accurately cut keys • 5-digit codes CANNOT be provided for 2019 and newer vehicles (the traditional 5-digit code from the key tag or driver's door lock cylinder is not sufficient and will not be issued for key cutting on these…
• 11028095Jan 7, 2026Seats. There are wrinkles on the leather seat cushion and/or seat back surface at PDI, when new vehicle is delivered, or when new upholstery is installed under Warranty repair. NOTE: This repair is not a permanent fix, it is meant to make new seats look their best when the vehicle is first presented to the customer. Wrinkles may not be completely removed after the repair is completed. Leather is a natural material and may…
• 11028128Jan 6, 2026Wheels. Some customers may complain that the tire sidewalls are distorted or "damaged". Sidewall waviness/indentations/undulations are common on radial tires and are more noticeable on tires with taller sidewalls. The higher the tire pressure, the more noticeable the effect will be. Be sure to set the tire pressures at the recommended tire pressure on the vehicle tire label. Sidewall indentations are a cosmetic condition…
• 11028127Jan 5, 2026Other or unknown. Some customers may report an odor or water in the HVAC system and upon inspection, the cabin air filter may be found to be wet.
• 11026917Dec 17, 2025Electrical 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.
• 11026913Dec 17, 2025Other or unknown, Electrical system. Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. The following DTC's may be stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) • U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL UNIT/TELEMATICS COMMUNICATION UNIT
• 11026908Dec 17, 2025Electrical system, Other or unknown. Mazda Connect Services - Frequently Asked Questions (FAQ)
• 11026916Dec 16, 2025Engine, Exterior lighting, 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 • Climate Control • 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Page
• 11026907Dec 10, 2025Other or unknown. Customers may report no audio when using the infotainment fader function fully adjusted to the rear. If the customer's vehicle is among the trim levels referenced above it is equipped with a 6-speaker infotainment system and does not include rear door speakers even though there are speaker grills/covers in the rear door panels. MazdaUSA and published vehicle specifications provide the correct information indicating…
• 11026904Dec 10, 2025Other or unknown. A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling unit which is caused by condensation, dust, and pollen within the cooling unit. This condition is usually worse during high humidity conditions. “Mazda Air Cooling Coil Coating” is available…
• 11026906Dec 4, 2025Body and structure. Some customers may experience that the fuel lid and charge lid do not lock or unlock during door lock/unlock operation. This is caused by: Improper dimensional accuracy of the lid actuator lock mechanism Incomplete control logic in the R-ESU software To eliminate this concern: The mold design of the lid actuator was modified. The control software of the R-ESU was revised.
• 11026354Nov 27, 2025Transmission and drivetrain. When inspected, the differential or PTO oil is dark or black. This is considered normal and NO repair should be performed. During production, differential ring and pinion gears receive a manganese phosphate coating (commonly referred to as black oxide). This coating forms a porous, oil-retentive surface that improves boundary lubrication and reduces adhesive wear during initial contact cycles. Designed as a…
• 11026100Nov 27, 2025Body and structure. Some vehicles may experience a clicking noise when opening and/or closing the front door due to a broken front door checker plate.

← All problems reported for the 2025 Mazda MAZDA3