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Service bulletins for the 2018 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.

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

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Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
MT-010-182019-02-19. Service bulletin. ELECTRICAL SYSTEM. Some vehicles (with MAZDA CONNECT) may exhibit a condition where DTC U0323(PCM) / U0423(ABS) /U3000(IC) CANNOT be deleted when the TPMS warning light flashes and/or the TCS/DSC indicator lights are illuminated. This can happen if the ignition is turned OFF within 20 seconds after the ignition is turned ON in one of the following two situations. 1. The ?ROOM? fuse (Engine compartment) is NOT installed when battery level is low. 2. The CMU (Connectivity Master Unit) is NOT connected.
SA-047-182019-02-19. Service bulletin. ELECTRICAL SYSTEM. Some customers may complain about a MAZDA CONNECT system reboot or blank screen. Use the flowchart below to repair the vehicle.
15-002-18-3502a2019-02-19. Service bulletin. ELECTRICAL SYSTEM. Some customers may complain about one or more warning lights ON when they start the vehicle during hot weather. The following DTC is stored in memory: U3000:98 - Forward sensing camera (FSC) stops functioning due to temporary high temperature. The combination of warning lights mentioned by the customer may include: SCBS/SBS, LAS/LDWS, HBC, Master Warning Light. Instrument Cluster Multi-Information Display (if equipped) warning messages may include: Forward Smart City Brake Support Malfunction, Smart Brake System Malfunction, Front Camera Sensor System Malfunction. MAZDA CONNECT center display warning messages may include: High Beam Control [HBC] / Lane-keep Assist System [LAS] Malfunction. Have the vehicle checked by a dealer if this indicator stays on. Smart City Brake Support [SCBS] Malfunction. Have the vehicle checked by a dealer immediately. Note: The center display Warning Messages are only displayed when the customer selects Applications>Vehicle Status Monitor>Warning Guidance>Warnings. This condition may be caused by poor heat radiation performance of the FSC. To eliminate this concern, a thermal pad has been added to the FSC.
SA-047-182018-12-17. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Some customers may complain about a MAZDA CONNECT system reboot or blank screen. Use the flowchart below to repair the vehicle.
MT-011-182018-12-17. Service bulletin. ELECTRICAL SYSTEM. SMS (Short Message Service) messages received by paired phones (Android and iPhone 5 iOS 7.0 or higher) can be downloaded, displayed, and played (text to voice) on vehicles equipped with MAZDA CONNECT. When parked, new messages can be displayed or read by the system. When driving, new messages can be read to the vehicle occupants.
MT-010-182018-12-17. Service bulletin. ELECTRICAL SYSTEM; TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS. Some vehicles (with MAZDA CONNECT) may exhibit a condition where DTC U0323(PCM) / U0423(ABS) /U3000(IC) CANNOT be deleted when the TPMS warning light flashes and/or the TCS/DSC indicator lights are illuminated. This can happen if the ignition is turned OFF within 20 seconds after the ignition is turned ON in one of the following two situations. 1. The ?ROOM? fuse (Engine compartment) is NOT installed when battery level is low. 2. The CMU (Connectivity Master Unit) is NOT connected.
09-037-18-3534a2018-11-13. Service bulletin. ELECTRICAL SYSTEM; ENGINE. Some vehicles equipped with MAZDA CONNECT may exhibit the following oil maintenance monitor concerns on the center display: The wrench light (Oil Change Due message) cannot be cleared using MAZDA CONNECT/Applications/Vehicle Status Monitor/Maintenance reset menu. The wrench light (Oil Change Due message) is displayed before the oil change is due. Vehicles with multi-information display Vehicles without multi-information display This is caused by only one reset procedure being performed when the oil is changed, usually using the center display. Two reset procedures are required, one is using the trip meter switch to reset the powertrain control module (PCM) and the other is using the center display to reset the connectivity master unit (CMU). To correct this issue, the CMU software has been modified so that the oil maintenance monitor reset operation on the center display resets both the CMU and the PCM at the same time. With this change, there set operation using the trip meter switch is now unnecessary.
SA-045-182018-11-13. Service bulletin. ELECTRICAL SYSTEM. For improvement of electrical diagnosis, the SKYACTIV® Wiring Terminal Test Kits has been delivered all the dealers. The terminal test kit enables you: To check pin fit drag of all terminals used in SKYACTIV® vehicles and compare suspect terminal drag with a good know terminal. To measure the voltage/resistance avoiding any terminal damage.
09-035-18-35092018-10-09. Service bulletin. ELECTRICAL SYSTEM. Some customers may experience one or more electrical malfunctions after a vehicle body repair. The newly painted fender stay (2) may be causing a poor front harness (1) ground connection.
MT-008-182018-10-09. Service bulletin. ENGINE; ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Some customers may complain about: Intermittent engine no start, Instrument cluster red security indicator light ON, Engine Start/Start Button Amber indicator, light flashing, Battery discharge, Electrical relay buzzing noise.This may be caused by: A key in a purse near a cell phone. The cell phone radio waves may interrupt the immobilizer system. An aftermarket cell phone charger. The charger may produce electrical noise that interrupts the immobilizer system. An aftermarket GPS tracker. Some aftermarket devices that are wired to the vehicles?s wiring harness may create unusual electrical symptoms.
MT-007-182018-10-09. Service bulletin. ELECTRICAL SYSTEM. Some customers may complain about the following: Engine no start. A blurry rear view monitor display. This may be caused by an aftermarket accessory device. Some aftermarket electrical devices (e.g., an accessory cell phone charger, GPS tracker...) may create excessive electrical noise. The noise may interrupt some of the vehicle electrical systems. Below are a few examples of an aftermarket cell phone charger and GPS tracker that are interrupting the vehicle electrical systems.
MT-004-182018-10-09. Service bulletin. ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT. 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. Below are a couple of examples of unusual electrical concerns caused by aftermarket devices.
MT-007-182018-08-27. Service bulletin. VISIBILITY:REARVIEW MIRRORS/DEVICES; ENGINE; ELECTRICAL SYSTEM. ENGINE NO START AND / OR REAR VIEW MONITOR DISPLAY IS BLURRY DUE TO AFTERMARKET ELECTRICAL DEVICE: Some customers may complain about the following: Engine no start. A blurry rear view monitor display. This may be caused by an aftermarket accessory device. Some aftermarket electrical devices (e.g., an accessory cell phone charger) may create excessive electrical noise. The noise may interrupt some of the vehicle electrical systems. Below are a few examples of an aftermarket cell phone charger that is interrupting the vehicle electrical systems.
MT-004-182018-08-27. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. ELECTRICAL CONCERN AND/OR MULTIPLE DTC'S DUE TO AFTERMARKET DEVICE: 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. Below are a couple of examples of unusual electrical concerns caused by aftermarket devices.
SA-036-182018-08-20. Service bulletin. ELECTRICAL SYSTEM. MAZDA MOBILE START (MMS) APP ERROR MESSAGE INSTALLED ON ANDROID DEVICES: Customers may get an error message "Device no longer has access or service." for the MMS APP installed on android devices starting 8/1/18. Inform the customer that all they need to do is update the MMS APP to the latest version to get rid of the error message.
15-002-18-35022018-08-20. Service bulletin. FORWARD COLLISION AVOIDANCE: SENSING SYSTEM: CAMERA; ELECTRICAL SYSTEM. Some customers may complain about one or more warning lights ON when they start the vehicle during hot weather. The following DTC is stored in memory: U3000:98 - Forward sensing camera (FSC) stops functioning due to temporary high temperature. The combination of warning lights mentioned by the customer may include: SCBS/SBS LAS/LDWS HBC Master Warning Light Instrument Cluster Multi-Information Display (if equipped) warning messages may include: Forward Smart City Brake Support Malfunction. Smart Brake System Malfunction. Front Camera Sensor System Malfunction. MAZDA CONNECT center display warning messages may include: High Beam Control [HBC] / Lane-keep Assist System [LAS] Malfunction. Have the vehicle checked by a dealer if this indicator stays on. Smart City Brake Support [SCBS] Malfunction. Have the vehicle checked by a dealer immediately. Note: The center display Warning Messages are only displayed when the customer selects Applications>Vehicle Status Monitor>Warning Guidance>Warnings. This condition may be caused by the FSC not being durable enough in high temperatures. [Earlier production Mazda3, Mazda6, CX-3 and CX-5 until summer 2017] The warning lights may stay on and these functions are deactivated until the ignition switch is turned off. Both U3000:98 (FSC) and U3000:04 (FSC) are stored. U3000:04 - Forward sensing camera (FSC) internal malfunction. If only U3000:04 (FSC) is stored, this TSB does not apply. This condition may be caused by FSC control logic that is too sensitive. When the FSC detects DTC U3000:98 during high temperature, it stops the internal communication and stores DTC U3000:04. DTC U3000:04 will not clear and SCBS/SBS, LAS/LDWS, and/or HBC functions will not resume until the ignition switch has been turned OFF even if the temperature of the FSC cools.
09-010-18-3440a2018-08-20. Service bulletin. ELECTRICAL SYSTEM. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 59.00.546 or later). NOTE: For 2016 CX-9 with version earlier than 59.00.441, the tachometer function will be removed from the Active Driving Display as part of Mazda's continuing efforts to improve safety and reduce driver distraction. Please explain this to the customer before updating the software. If the customer agrees, turn off the tachometer display on the AD-Display tab in MAZDA CONNECT Settings before performing the update. NOTE: If the customer has customized MAZDA CONNECT with something like a different background using unauthorized software, make sure they know the following information before updating MAZDACONNECT to avoid any issues later on. Updating MAZDA CONNECT to the latest version will erase any customization created by unauthorized software. Unauthorized customization software will not work on the latest version of MAZDA CONNECT software. The latest version of MAZDA CONNECT software cannot be rolled back to an earlier version. Mazda does not recommend unauthorized customization of MAZDA CONNECT due to the possibility of unexpected problems. Any issues related to this will not be covered under Mazda warranty policy.
SA-021-182018-05-14. Service bulletin. ELECTRICAL SYSTEM. MAZDA CONNECT SOFTWARE VERSION 59.00.545 AVAILABLE. An update to the MAZDA CONNECT system is now available for download from the Mazda Global Service Support (MGSS) system. The new version number is 59.00.545. Mazda Requests the MAZDA CONNECT system be updated on all new vehicle inventory and CPO vehicles ASAP. For CPO inventory vehicles out of warranty, for this software release only, you may use Dealer Self Authorization or DSM goodwill. Click on "Infotainment", then "MAZDA CONNECT Updates" to download it and update your USB drives. Also make sure to select "All Files" for "Save as type:". If left as "Compressed (zipped) Folder," the file will be saved as a ".zip" no matter what you use as an extension. DO NOT shut off the ignition or let it shut off at any time during the entire MAZDA CONNECT update process (both Failsafe and Reinstall), otherwise the CMU may be damaged and need to be replaced.
09-001-18-3387a2018-05-07. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Some customers may experience the MAZDA CONNECT rebooting or the screen turning black during extremely cold temperatures. The concern occurs when the interior of the vehicle is cold and disappears when the interior warms up. This is caused by some SD cards for the MAZDA CONNECT navigation system being manufactured with improper hardware, resulting in a data reading error during extremely cold temperatures. To correct the concern, the SD card hardware has been changed.
SA-017-182018-04-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Upgrade your PCs to IDS version 109.00 and 109.01 from the previous version. NOTE: You may see ?Selection not available? on IDS when a selecting ?Programming menu?, 108.07 included a timer extension for Programming menu application that had to be installed before the expiration date of 3/27/18. After the expiration, IDS can?t accept the extension. To correct this, uninstall IDS and re-install IDS 108.00 >IDS 108.07 up-date. Select "Remove Mazda data files and settings" as shown below.
SA-012-182018-04-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Some 2018 vehicles built after January 1, 2018 and equipped with Navigation may exhibit one of these concerns after the user inputs an address: A screen pops up that says "House number not found." After the user selects OK, the system finds the address or a nearby address.Instead of finding the correct address number the system adds a digit to the end of the number. Example: You enter 151 and the system comes back with 1510, 1511, 1515, 1516, etc.This only occurs with MAZDA CONNECT software version 59.00.540, which started being installed into vehicles in January 2018. The concern can be eliminated by installing MAZDA CONNECT software version 59.00.504.
DRW132018-04-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Dealer Rework (DRW) 13 ? Mazda Connect Navigation Concern 2018MY CX-5, CX-3, CX-9, Mazda6, Mazda 3 and MX-5: We write to inform you that certain vehicles are affected by the concern mentioned below. Vehicles affected by this DRW will be visible, March 15th 2018. Parts and Warranty information and VIN lists for the DRW13 will be uploaded to MGSS on March 15, 2018. On the Mazda Connect Navigation system, when the destination is selected by entering an address, there may be a concern when entering the ?House/Business Number? as described below. a) A ?House number not found? pop-up is displayed, although the house number and selected location is correctly shown on the map. b) A ?House number not found? pop-up is displayed, but the house number displayed is different from the number inputted although the selected location is correctly shown on the map. c) The house number cannot be set up correctly. The Navigation results of house number search doesn?t match with the number inputted. Causal factor: Inappropriate software of connectivity master unit (CMU)
MT-004-182018-04-23. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. If you encounter any type of electrical concern (e.g, dead battery), 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. Below are a couple of examples of unusual electrical concerns caused by aftermarket devices.
01-009-18-34522018-04-23. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. The Mazda GR8-1291 is required for all warranty battery testing. If the Mazda GR8-1291 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.
01-008-18-34512018-04-23. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This service bulletin 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 maintain the battery periodically according to the repair procedure.

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