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.

• 10179175Aug 3, 2020Electrical system. 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.
• 10179157Aug 3, 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
• 10177974Jul 27, 2020Equipment. DRW29 - 2020 CX-3, CX-30, CX-5, CX-9, MAZDA6 AND MAZDA3 - SECOND PDI OF ALLOCATED FLEET VEHICLES: Concern Outline: There are 597 vehicles contained in this DRW, and all had a paid Pre-Delivery Inspection performed at the port and were to be used as fleet vehicles.
• 10177852Jul 27, 2020Equipment, Engine, Electrical system, Latches, locks and linkages. When the vehicle is in sleep mode, some customers may experience a failed remote control attempt using the MyMazda APP, however, the second attempt works fine and no DTCs are stored. Remote control functions: - Remote Engine Start/Remote Engine Stop - Remote Door Lock/Remote Door Unlock - Remote Hazard Light. This concern may be caused by improper telematics communication unit control software. To eliminate this…
• 10177956Jul 24, 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.
• 10177952Jul 22, 2020Equipment. 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.
• 10177934Jul 20, 2020Electrical system, Engine. Some customers may experience an engine no start due to low battery voltage on 2019-2020 Mazda3 and 2020 CX-30. 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…
• 10177927Jul 20, 2020Electrical system, Engine. 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:
• 10177847Jul 20, 2020Equipment. When encountering a vehicle with paint damage, refer to the "Mazda Paint Warranty Guide" to determine cause, prevention, remedy, and warranty coverage (if applicable).
• 10177924Jul 16, 2020Electrical system. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
• 10177846Jul 16, 2020Equipment, Electrical system. Some customers may hear a repeating click sound when using the HVAC system. The click sound may be caused by the air mix doors moving back and forth. This concern has been eliminated by a dash-electrical supply unit control software modification.
• 10177840Jul 16, 2020Electrical system, Engine cooling, Transmission and drivetrain. Some customers may experience the master warning light turning on and a lack of power with DTC P2BF6:00 (Exhaust shutter valve position sensor circuit low input (1DC)) stored in memory. This is caused by improper logic written in the PCM for the exhaust shutter valve position sensor.
• 10177853Jul 15, 2020Electrical system, 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.
• 10177851Jul 15, 2020Equipment, Brakes, Forward collision avoidance. 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 and damaging the radar sensor, resulting in the DTC C1A67:04. To eliminate this concern, the front radar sensor…
• 10177943Jul 10, 2020Body and structure. Some customers or technicians (during PDI) may have concerns with the front doors sticking (especially on hot days) and/or poor appearance, fitment, alignment or gaps with the front and rear door sash molding. These concerns may be related to the door sash molding interference between the front and rear doors.
• 10177937Jul 9, 2020Engine cooling, Brakes. If a customer comes in with the following concerns:  OIL PRESSURE WARNING light and/or the CHECK ENGINE light ON.  DTC P055F and/or P0524 stored.  No driveability concern or engine mechanical noise.  Outside the VIN range in TSB 01-020/18.
• 10177841Jul 8, 2020Equipment, Engine cooling, Electrical system. Some customers may complain about a very low frequency noise and/or vibration felt at the steering wheel, the floor and/or the seats when driving at 1500-1650 rpm in any gear position. This may be caused by normal vehicle behavior while the cylinder deactivation is active (two cylinders drive). The state of the cylinder deactivation can be monitored in the center display to help verify if this is the issue…
• 10177920Jul 6, 2020Equipment. In order to ensure key code security, MNAO has restricted key code access for the new auxiliary key. This Service Alert provides information on how to obtain the 10-digit key code needed for cutting a new auxiliary key blank if all auxiliary keys are lost.
• 10177848Jul 6, 2020Equipment, Body and structure. 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…
• 10177009Jun 29, 2020Electrical system, Equipment. 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.
• 10177004Jun 29, 2020Equipment. When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to initialize 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:If TCU initialization is not performed, connected vehicle functions will not operate. This will have a negative impact on the customer because they will need to…
• 10177014Jun 26, 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…
• 10176980Jun 25, 2020Equipment, Electrical system. 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. (TCU - Tel antenna No. 1 malfunction) (TCU - TEL antenna No.1 circuit malfunction) (CMU - GPS antenna signal circuit malfunction).
• 10177011Jun 23, 2020Forward collision avoidance, Lane departure, Visibility (wipers, defrost…. FSC dynamic aiming (mid-drive aiming) may not complete if the vehicle is driven on a road as described below: The road lane markings are covered by snow and are not visible. There are no road lane markings on the road surface. The road is winding and the vehicle cannot drive straight (300 m / 984 ft or more turning radius is required).
• 10177008Jun 23, 2020Electrical system, Equipment. 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.
• 10177006Jun 23, 2020Equipment, Electrical system. MAZDA CONNECT Software Version 11002 NOTE: “2019 Mazda3 owners may notice an icon in their infotainment’s display that indicates Mazda Connected Services. This new feature is a global technology and designed with the latest version of Mazda ConnectTM. At this time, the service is not active for 2019 Mazda3 vehicles in the U.S.
• 10177018Jun 22, 2020Equipment. Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) C1 on certain 2020 Mazda3 vehicles equipped with Mazda Connect, and built from June 29, 2019 through September 2, 2019. There are 148 vehicles in the United States affected by this SSP. Concern Outline: On certain Mazda3 vehicles, it is possible that the following concerns may occur when a customer attempts to set up their connectivity…
• 10177015Jun 22, 2020Engine cooling. If a customer comes in with the following concerns, perform the inspection procedure.  OIL PRESSURE WARNING light and/or the CHECK ENGINE light ON.  DTC P055F and/or P0524 stored.  No driveability concern or engine mechanical noise.  Outside the VIN range in TSB 01-020/18.
• 10176962Jun 22, 2020Engine cooling, Transmission and drivetrain, Electrical system. Some customers may experience the master warning light turning on and a lack of power with DTC P2BF6:00 (Exhaust shutter valve position sensor circuit low input (1DC)) stored in memory. The PCM software has been modified to avoid the unnecessary warning light illumination and power restriction with no modification to the cylinder deactivation function and the error detection logic has been changed not to detect…
• 10177017Jun 16, 2020Equipment. Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) C1 on certain 2020 Mazda3 vehicles equipped with Mazda Connect, and built from June 29, 2019 through September 2, 2019. There are 148 vehicles in the United States affected by this SSP. Concern Outline: On certain Mazda3 vehicles, it is possible that the following concerns may occur when a customer attempts to set up their connectivity…
• 10177013Jun 12, 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…
• 10177012Jun 10, 2020Transmission and drivetrain. When replacing manual or automatic transmission, make sure to remove the plug from the old transmission (as shown below) and then re-install it to the new transmission with a new washer. The new transmissions (including remanufactured A/T) have a shipping plug, as shown in the figures (M/T: black, rubber made; A/T: pink and black, with breather). This plug is for shipping use only and needs to be removed in order…
• 10177007Jun 5, 2020Electrical system, Equipment. 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.
• 10176972Jun 4, 2020Engine, Transmission 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.
• 10177010Jun 1, 2020Equipment. Some customers may complain about any of the following: Vehicle Center Display does not provide the One Time Pass Code during the MyMazda App Connected Vehicle enrollment. Remote function(s) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF. Confirm the customer's phone and vehicle have good to strong reception during the concern as shown in the table below.
• 10177003Jun 1, 2020Equipment. When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to initialize 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:If TCU initialization is not performed, connected vehicle functions will not operate. This will have a negative impact on the customer because they will need to…
• 10176060May 22, 2020Electrical system. 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
• 10176062May 21, 2020Equipment. Customer Service Program (CSP)04 - Connected Services Deactivated - 2020 CX-30 and Mazda3.
• 10176059May 18, 2020Electrical system. 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
• 10176057May 18, 2020Transmission and drivetrain. When performing any service or repair on a customer's 2020 Mazda3 or CX-30, use MDARS to switch to Restricted Transmitting Mode. Restricted Transmitting Mode: Restricts MyMazda App remote functions. Prevents error messages being sent to the customer during vehicle service or repair. NOTE: Cancel Restricted Transmitting Mode after completing vehicle service or repair.
• 10176049May 18, 2020Equipment. Some customers may complain about any of the following: Vehicle Center Display does not provide the One Time Pass Code during the MyMazda App Connected Vehicle enrollment. Remote function(s) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
• 10176046May 18, 2020Equipment. 2019-2020 MAZDA3 SERVICE CAUTIONS FOR NEW AND REVISED FEATURES: Connected Vehicle, Connected Vehicle Maintenance Mode, Mazda Connected Vehicle Viewer (MCVV).
• 10176042May 11, 2020Equipment. In order to ensure key code security, MNAO has restricted key code access for the new auxiliary key. This Service Alert provides information on how to obtain the 10-digit key code needed for cutting a new auxiliary key blank if all auxiliary keys are lost.
• 10176044May 8, 2020Equipment, Electrical system. When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to initialize 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: If TCU initialization is not performed, connected vehicle functions will not operate. This will have a negative impact on the customer because they will need to…
• 10176052May 5, 2020Forward collision avoidance. Some vehicles may experience M-MDS (MDARS) showing the front radar dynamic aiming is incomplete although the procedure is completed. This is caused by faulty front radar software logic and a mass production change is planned. If the screen below is displayed after the front radar dynamic aiming is performed, check the vehicle using the following inspection procedure.
• 10174617Apr 29, 2020Equipment, Electrical system. When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to initialize 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: If TCU initialization is not performed, connected vehicle functions will not operate. This will have a negative impact on the customer because they will need to…
• 10174691Apr 28, 2020Equipment, Engine cooling. Some customers may expierience an engine no start condition where the engine will only start by holding the key transmitter over the Start/Stop button and DTC B13D3:97 (Remote transmitter registration work not completed) is stored. This may be caused by an accidental activation of the keyless pacemaker function.
• 10174588Apr 23, 2020Equipment, Visibility (wipers, defrost, mirrors). 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.
• 10174586Apr 23, 2020Electrical system, Latches, locks and linkages, Equipment. Some customers may experience that the door locks may not operate using the touch sensor on the outer door handle while parked in a parking space surrounded by concrete walls, but will operate when using the remote transmitter. This concern may be caused by refraction and/or diffraction of the signal used for the advanced keyless entry system by the steel reinforcement bars in the concrete walls.
• 10174567Apr 23, 2020Engine 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.

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