2020 Mazda MAZDA3 Technical Service Bulletins

726 technical service bulletins (TSBs) are on record for the 2020 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.

• 10185186Dec 3, 2020Engine cooling, Equipment, Electrical system. 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. NOTE: Cylinder head replacement requires MASH authorization.
• 10185058Dec 3, 2020Back-over prevention (rear camera), Electrical system, Equipment. Some vehicles may exhibit that both sides (right and left sides) of the Blind Spot Monitoring (BSM) and Rear Cross Traffic Alert (RCTA) system do not work
• 10185185Dec 2, 2020Equipment, Engine cooling. Some customers may experience the CHECK ENGINE LIGHT ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: The engine takes longer to warm up. The engine temperature gauge fluctuates. The low coolant temperature indicator (blue) light stays on longer or comes on while driving. Poor heater performance, especially at idle.
• 10183664Nov 30, 2020Electrical system, Engine cooling, Equipment, Latches, locks and linkages. 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…
• 10183660Nov 30, 2020Equipment. MAZDA CONNECTED SERVICES - FREQUENTLY ASKED QUESTIONS (FAQ). 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, Dealer Processes, Educational Videos, Resources
• 10183667Nov 17, 2020Equipment, Engine cooling. HVAC SYSTEM BLOWS HOT AIR UNDER ACCELERATION. Some customers may complain that the HVAC system blows hot air on occasion (blows cold air, then hot air, then cold air again). The customer may notice that it is more pronounced when they first start driving the vehicle and/or when accelerating.
• 10183665Nov 17, 2020Visibility (wipers, defrost, mirrors), Equipment, Forward collision avoidance. FORWARD SENSING CAMERA (FSC) DYNAMIC AIMING NOT COMPLETED AND/OR DTC B14F0:76 STORED. CAUTION: DO NOT turn the igintion OFF after dynamic aiming starts until aiming has completed or aiming timeout. If the ignition is turned OFF, the VCM will store B14F0:76 and FSC aiming will not complete. FSC dynamic aiming (mid-drive aiming) may not complete if the vehicle is driven on a road as described below: The road lane…
• 10183598Nov 16, 2020Equipment. Some customers may experience the master warning light and/or the "In-Vehicle Network Malfunction" warning message in the instrument cluster on with DTC B119F:01, B119F:13 and/or B119F:2B stored when the vehicle position cannot be displayed correctly.  B119F:01 (TCU - Tel antenna No.
• 10183663Nov 6, 2020Electrical system, Exterior lighting, Engine cooling. 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…
• 10183659Nov 6, 2020Equipment, Electrical system. When the body control module (BCM) has been replaced or reprogrammed and the software is updated to the file names shown below, DTC U2050:55-BCM (Activation of remote control not implemented) may be stored in memory without any warning indication for the driver. This is caused by a communication error between the telematics communication unit (TCU) and BCM when the control software in them are not of the version…
• 10183589Nov 4, 2020Equipment, 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.
• 10182104Oct 30, 2020Electrical system. Some customers may notice white lines appearing across the instrument cluster (as shown below). The white lines may be caused during the production process where poor contact occurs at the internal LCD terminals.
• 10182123Oct 28, 2020Engine cooling, Equipment. Currently, the instructions on MGSS recommend the use of Loctite 962T or equivalent when installing a SKYACTIV cylinder head, but it is no longer available. The following 3 adhesives are alternatives available as an equivalent to Loctite 962T: Loctite 272, Loctite 518 Threebond TB-1386H
• 10182120Oct 28, 2020Electrical system. CONNECTED VEHICLE SYMPTOM TROUBLESHOOTING: 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…
• 10182097Oct 20, 2020Equipment, Electrical system. AUDIO, NAVIGATION AND PHONE CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM (7TH GENERATION MODELS). Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7000C0A-NA01_11012 or later). NOTE: Device compatibility can be found at connect.mazda.com - Support - Compatibility.
• 10182110Oct 19, 2020Equipment. MAZDA CONNECTED SERVICES - FREQUENTLY ASKED QUESTIONS (FAQ). 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, Dealer Processes, Educational Videos, Resources
• 10182108Oct 19, 2020Engine cooling, Electrical system. Some customers may experience an “In-Vehicle Network Malfunction” message appearing in the instrument cluster. This concern occurs when turning the ignition on or starting the engine when the battery is at 8 volts or lower (vehicle is in sleep mode), then it is charged to normal voltage while connected to the vehicle. NOTE: This concern will not occur if the battery is charged when removed from the vehicle.
• 10182124Oct 16, 2020Electrical system, Back-over prevention (rear camera), Equipment. MAZDA CONNECT SYMPTOM TROUBLESHOOTING (7TH GENERATION VEHICLES). Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure. Index: No. 1 Blank Screen No. 2. Rear View Camera is not displayed No. 3 Rebooting No. 4 Infotainment System Has No Sound No. 5 Commander Switch Does Not Work No. 6 Bluetooth device will not pair No. 7 Incorrect GPS position No. 8 Voice…
• 10182122Oct 15, 2020Electrical system, Equipment. APPLE CARPLAY / ANDROID AUTO FREQUENTLY ASKED QUESTIONS (FAQ): NOTE: 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
• 10182107Oct 13, 2020Electrical system. Some vehicles may exhibit that DTC B2002:49 will not clear with the Mazda Modular Diagnostic System (MMDS). Applicable vehicles are equipped with the Electrical supply unit (ESU) BCKA-67-5Z0B.  DTC B2002:49 [BODY CONTROL MODULE (BCM)] - Electrical supply unit (ESU) internal malfunction (No warning/indicator light illumination) This is caused by improper control software of the ESU. To eliminate this concern…
• 10182096Oct 13, 2020Equipment, Electrical system. AUDIO, NAVIGATION AND PHONE CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM (7TH GENERATION MODELS). Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7000C0A-NA01_11012 or later). NOTE: Device compatibility can be found at connect.mazda.com - Support - Compatibility. 16-001-20-3683c
• 10182121Oct 12, 2020Equipment. ACCESSORY INSTRUCTIONS LOCATION: Accessory instructions can be found in the Accessory eCatalog. https://ecatalog.mazdausa.com
• 10182098Oct 12, 2020Equipment, Electrical system, Engine cooling. Some customers may complain that the A/C blows warm air while idling after restarting a warm engine. This is caused by improper control software of the PCM not allowing the active air shutter to open properly, resulting in lower cooling performance at idle. To eliminate this concern, the control software of the PCM has been modified.
• 10180595Sep 30, 2020Engine cooling. Some vehicles may experience the check engine light on with DTCs P2096:00, P2097:00 and/or P0524:00 that cannot be cleared by itself, and the check engine light stays on even if the detection condition has gone. P2096:00 - Air fuel too lean  P2097:00 - Air fuel too rich  P0524:00 - Engine oil pressure too low. This concern may be caused by improper PCM control logic. The PCM software has been…
• 10180783Sep 29, 2020Engine cooling, Equipment. MAZDA CONNECTED SERVICES - FREQUENTLY ASKED QUESTIONS (FAQ). 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, Dealer Processes, Conditions for Remote Engine Start Will Not Function, Conditions for Remote Engine Start Function Will turn engine OFF, Educational Videos…
• 10180781Sep 29, 2020Equipment. When the body control module (BCM) has been replaced or reprogrammed and the software is updated to the file names shown below, DTC U2050:55-BCM (Activation of remote control not implemented) may be stored in memory without any warning indication for the driver. This is caused by a communication error between the telematics communication unit (TCU) and BCM when the control software in them are not of the version…
• 10180669Sep 25, 2020Equipment, Body and structure. Some vehicles may exhibit that the liftgate interferes with the rear bumper when closed forcefully, resulting in damaged paint on the rear bumper. Due to variations of the clearance between the liftgate and the rear bumper, the bottom edge of the liftgate may overrun the rear bumper. To correct this concern, the hardness of stop rubbers on the liftgate has been modified.
• 10180598Sep 24, 2020Transmission and drivetrain, Electrical system. Some customers may complain about a surging at low speeds and during acceleration. This surging is in the longitudinal direction, felt about 2 cycles per second, and occurs in the locked up 1st gear. This may be caused by the torque fluctuation and the torsional resonance in the torque converter. To correct this concern, the PCM software has been modified to reduce the torque fluctuation.
• 10180794Sep 23, 2020Equipment. When replacing the Body Control Module (BCM) in a 7th generation vehicle, it needs to be configured and the instructions in the Workshop manual on MGSS are incorrect. Use the instructions in the Repair Procedure below to configure the new BCM.
• 10180786Sep 22, 2020Equipment, Back-over prevention (rear camera). MAZDA CONNECT SYMPTOM TROUBLESHOOTING (7TH GENERATION VEHICLES). Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure. Index: No. 1 Blank Screen No. 2. Rear View Camera is not displayed No. 3 Rebooting No. 4 Infotainment System Has No Sound No. 5 Commander Switch Does Not Work No. 6 Bluetooth device will not pair No. 7 Incorrect GPS position No. 8 Voice…
• 10180788Sep 21, 2020Equipment. Some customers may experience an engine no start condition where the engine will only start by holding the key transmitter over the Start/Stop button. This may be caused by an accidental activation of the keyless pacemaker function. NOTE:  DTC B13D3:97 (Remote transmitter registration work not completed) is stored if key programming is performed when keyless pacemaker function is activated.  Key…
• 10180717Sep 14, 2020Equipment, Electrical system. When performing vehicle services such as control unit software update, control unit registration/activation, CMU log data retrieval, etc., always do the following:  Use the GR8 battery charger SST to maintain battery voltage. See SA-063/20.  Use M-MDS hardware that is in good working condition. CAUTION: If the GR8 is not used or if the M-MDS hardware is not in good working condition, a control unit…
• 10180787Sep 10, 2020Equipment. Some customers may experience a "IN-VEHICLE NETWORK MALFUNCTION" warning message in the instrument cluster with one or more of the following DTC's stored:  B119F:01 TCU - Tel antenna No.
• 10180714Sep 10, 2020Equipment, Engine cooling. If you receive a customer concern about the CHECK IN light coming on and DTC P3400 (cylinder deactivation system malfunction) stored, the cylinder deactivation oil control valve may be plugged with plastic debris from the oil filter wrapper. The debris may enter the center of the oil filter when poking a hole in the filter wrapper during removal, and then travel through the engine and plug the cylinder deactivation…
• 10180715Sep 9, 2020Transmission and drivetrain, Equipment, Engine cooling. Some customer's may complain that the HVAC system only blows warm to cool air (not cold) after starting the vehicle and not moving right away. This may be caused by a closed Active Air Shutter (AAS). Under specific circumstances, the AAS has a “learning issue” where AAS is kept closed after startup even if the PCM requests it to be open. The shutters will open and work correctly as soon as the vehicle…
• 10180596Sep 2, 2020Suspension, Equipment. Some vehicles may exhibit a rattle noise from the front suspension when driving over bumps or on a road with a wavy surface. The noise may be caused by the mounting rubber (1) because of insufficient clearance between the rubber and the metal bracket of the mounting rubber during the assembly process. To correct this issue, the mounting rubber has been modified to ensure the proper clearance.
• 10180793Sep 1, 2020Electrical system, Equipment. When replacing the Body Control Module (BCM) in a 2019 Mazda3, it needs to be configured and the instructions in the Workshop manual on MGSS are incorrect. Use the instructions in the Repair Procedure below to configure the new BCM.
• 10180792Sep 1, 2020Equipment, Electrical system. During BCM replacement, MDARS may display a Configuration Error warning message. This may be caused by any of the following: Poor internet connection  MDARS failure Low Battery. Perform the BCM Recovery Procedure below to manually configure the BCM.
• 10179084Aug 27, 2020Seats. Some customers may complain about a squeaking noise when sliding the front seat. This is caused by a deformed front seat side bolster that rubs on the rear console lid. To eliminate this concern, the shape of the front seats has been changed.
• 10179086Aug 21, 2020Transmission and drivetrain, Electrical system, Engine cooling. Some customers may not be comfortable with being notified of an engine stall due to an error when operating the clutch pedal. When the engine stalls, the charging system warning light is illuminated and a vehicle malfunction notification is received through the MyMazda APP on the mobile device. This is caused by improper control software of the PCM. To eliminate this concern, the PCM software has been modified to…
• 10179085Aug 21, 2020Brakes, Equipment. Some vehicles equipped with Smart Brake Support (SBS) may exhibit a front radar system malfunction message in the instrument cluster with DTC C1A67:04 (front radar sensor internal malfunction) stored in memory. This may be caused by water penetrating into the front radar sensor through the breather hole when exposed to a great amount of water and damaging the radar sensor, resulting in the DTC C1A67:04. To…
• 10179172Aug 20, 2020Engine 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. NOTE: Cylinder head replacement requires MASH authorization.
• 10179315Aug 18, 2020Electrical system. When performing vehicle services such as control unit software update, control unit registration/activation, CMU log data retrieval, etc., always use the GR8 battery charger SST to maintain battery voltage.
• 10179313Aug 13, 2020Brakes, Forward collision avoidance, Equipment, Visibility (wipers, defrost…. Some customers may complain about the following message displayed in the Multi-Information Display: In the following cases, the MRCC with Stop & Go function system is canceled when the vehicle is traveling at 19 mph (30 km/h) or less:  The Forward Sensing Camera (FSC) cannot detect target objects due to one of the following:  The windshield is dirty  The FSC lens is foggy  There is low…
• 10179081Aug 13, 2020Fuel system. 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…
• 10179078Aug 11, 2020Equipment. Some customers may experience a no start because the battery is discharged after the vehicle is parked for more than 8 hours. This may be caused by one or more of the following, resulting in excessive parasitic draw (dark current) on the battery. 1. The vehicle control system may not have gone to sleep because a key fob was left in the vehicle after the ignition switch was turned off and the doors were closed.
• 10179166Aug 10, 2020Engine cooling. Some customers may experience an engine no start due to low battery voltage on 2019-2020 Mazda3 and 2020 CX30. Inform the customer that Mazda is actively investigating this issue and apologizes for any inconvenience. Mazda would like to request both dealer and customer support to expedite a repair. Customers having this concern should be instructed to contact Mazda Roadside Assistance and have their vehicle…
• 10179164Aug 7, 2020Electrical system. On some vehicles, the Commander switch might be inoperative. This could be caused by fuse F13 (15A) being removed instead of F15 (15A) at the factory in the lower panel compartment on the left side of the steering wheel.
• 10179170Aug 5, 2020Engine 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. NOTE: Cylinder head replacement requires MASH authorization.
• 10179228Aug 3, 2020Tires, Wheels. New CARB regulation regarding mandatory checking and documenting of tire pressure whenever a vehicle is in for service work. This applies to all service shops (including Mazda dealerships) in California effective September 1, 2010.

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