2019 Mazda MAZDA3 Technical Service Bulletins

827 technical service bulletins (TSBs) are on record for the 2019 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.

• 10169540Dec 19, 2019Equipment, Engine cooling. 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. Metallic debris from the old engine (with catastrophic internal mechanical failure) may rest inside the intake manifold.
• 10169513Dec 18, 2019Other or unknown, Transmission and drivetrain. WARRANTY GUIDELINES FOR RETURNED TRANSMISSION CORES. Be advised that the Mazda Remanufactured Transmission Center (MRTC) has found that up to 30% of the returned transmission cores either included the wrong transmission oil cooler, or the oil cooler was missing altogether. IMPORTANT NOTE: ALWAYS REMEMBER TO INCLUDE THE ORIGINAL OIL COOLER WITH THE RETURNED TRANSMISSION CORE!
• 10169539Dec 17, 2019Equipment. 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…
• 10169535Dec 17, 2019Equipment, Exterior lighting, Visibility (wipers, defrost, mirrors). Some customers may complain about an instrument cluster warning message "Auto Light System Malfunction. Turn On/Off Lights Manually". DTC B10AD:09 (Humidity sensor/solar radiation sensor/auto light sensor/rain sensor malfunction) may also be stored with the exterior light warning indicator light ON. This is caused by the rain sensor detecting a temperature higher than the operation range and temporarily stopping…
• 10169541Dec 16, 2019Equipment, Latches, locks and linkages. Effective immediately, MSP56 has been suspended until further notice. MSP56 was launched to prevent 2019 Mazda3 5dr vehicles from locking, if the keys are left inside the vehicle. There have been reports of Body Control Module (BCM) failures during the update process, and in the worst case scenario, a loss of vehicle mileage in the odometer. Until further notice, DO NOT update or reflash the Body Control Module…
• 10169543Dec 13, 2019Equipment, Visibility (wipers, defrost, mirrors), Other or unknown. Accessory instructions can be found in the Accessory eCatalog. https://ecatalog.trademotion.com/. Audio/Electrical, Exterior, Interior: - Mazda Mobile Start (MMS) - Remote Engine Start - Wireless Charging Pad - Mirror - Navigation - Rear Parking Sensors - Rear Seat Entertainment - Smartphone Screen Mirroring - Bumper Trim/Guards - Door Mirror Caps - Fog Lights - Moonroof Wind Deflector - Roof Rack - Side Window…
• 10169537Dec 13, 2019Engine cooling, Equipment. 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 Bulletin is to inform you about the water pump sealing mechanism and the criteria if replacement is necessary or not.
• 10169536Dec 13, 2019Engine cooling, Transmission and drivetrain. Some customers may experience the CHECK ENGINE light ON with DTC P0012:00 (Electric variable valve timing control system: Over-retarded) stored in PCM memory. NOTE: This concern occurs only on the vehicles with PCMs manufactured by MITSUBISHI.This is caused by improper control logic of the PCM detecting a false error. To correct this issue, the PCM software has been modified. NOTE: The VVT actuator is damaged by…
• 10169507Dec 12, 2019Equipment. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
• 10169510Dec 10, 2019Equipment. Some vehicles may store DTC U2050:55 (Activation of remote control not implemented) after a BCM software update. Follow the repair procedure when this issue occurs.
• 10169544Dec 5, 2019Electrical system, Equipment, Body and structure. 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.
• 10169509Dec 5, 2019Transmission and drivetrain, Engine cooling. GUIDE LINES AND PHOTOS TO DETERMINE IF FLUID/OIL SEEPAGE OR LEAK IS SEVERE ENOUGH TO REQUIRE WARRANTY REPAIR OR TO CLEAN AND MONITOR. Some customer's might state that they notice fluid or oil leaking/dripping on the ground when the vehicle is parked. For this concern, inspect the vehicle for any trace of a fluid or oil leak and use the following examples as a guide to determine if it is severe enough to require a…
• 10169506Dec 5, 2019Equipment. 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.
• 10168786Nov 26, 2019Engine cooling. Some vehicles may exhibit an excessive body vibration when idling or driving after being left in extremely cold weather (-20°F or below) for a long time. This is caused by the No.1 engine mount (1) rubber hardening due to material characteristics.
• 10168785Nov 26, 2019Engine cooling. Some vehicles may exhibit oil leakage from the drive belt auto tensioner and rattling noises from the engine compartment. This may be caused by insufficient sealing at the drive belt auto tensioner damper when the auto tensioner fully operates under both high ambient temperature and high load conditions. To eliminate this concern, the shape of the drive belt auto tensioner damper has been changed.
• 10168142Nov 21, 2019Equipment, Forward collision avoidance. 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). FSC dynamic aiming is completed if the following conditions…
• 10168141Nov 20, 2019Electrical system, Equipment, Engine cooling. 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.
• 10168139Nov 20, 2019Engine cooling, Equipment, Electrical system. 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  DTC B13D3:94 (Communication error with remote transmitter) stored.This may be caused by:  A key in a purse near a cell phone. The cell phone radio…
• 10168071Nov 18, 2019Equipment. Some customers may experience that after starting the engine, the auto A/C blows warm air for about 10 minutes and then blows cool air as desired. This concern occurs when the ambient temperature is within a certain range (approx. 16-25 C / 61-77 F). This is caused by the control software of the Dash-Electrical Supply Unit (Dash-ESU) not being appropriate for this specific situation. To correct this concern, the…
• 10168122Nov 14, 2019Equipment, Body and structure, Electrical system, Latches, locks and linkages. Mazda Motor Corporation has decided to conduct a Mazda Service Program (MSP) on certain 2019 Mazda3 5HB vehicles produced from November 6, 2018 through May 28, 2019. Concern Outline: On certain subject Mazda3 5HB vehicles with the advanced keyless function, all doors, fuel filler door, and the liftgate can be locked by pressing the door-lock switch on the liftgate.
• 10168099Nov 14, 2019Engine cooling, Electrical system. Some vehicles that have a drained battery recovered may exhibit that the engine will not start and the ignition switch will not turn off. The following DTC's may also be stored:  U3000:49 - BCM internal malfunction  B10E7:12 - IG1 relay circuit malfunction  P0615:11 - Starter relay circuit malfunction. This concern most likely occurs on vehicles in a show room with frequent door operation and poor…
• 10168074Nov 7, 2019Equipment, Electrical system, Forward 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.
• 10168115Nov 5, 2019Equipment, Electrical system. On the 2019 Mazda3 (BP) and and all 2020 Mazda vehicles (except CX-3), the CR2032 button cell battery is required for the new type remote transmitter. If it is mistakenly replaced with the conventional CR2025 used in the previous type remote transmitter, it may cause a malfunction. Verify the button cell battery type before replacing it.
• 10168072Nov 4, 2019Electrical system, Engine, Equipment. Some customers may complain about poor heater performance even after the engine reaches normal operating temperature. This may be caused by a plugged heater core. For 2014-2016 Mazda6 and 2013-2016 (US spec) / 2017 (Mexico spec) CX-5, the CHECK ENGINE light may turn on with DTC P011A:00 (ECT sensor No.1/No.2 performance problem) stored at the same time. NOTE: Refer to TSB 01-015/15 if the customer is using a block…
• 10166853Oct 30, 2019Equipment, Electrical system. Currently, Mazda does not have a way to cut the auxiliary keys for the new style remote transmitter as they use a different key code than the previous transmitter key. Follow the repair procedure if one or both auxiliary keys are lost:
• 10166849Oct 30, 2019Forward collision avoidance, Equipment. Some vehicles may exhibit DTC B14F0:76 [VCM] (Forward sensing camera (FSC) deviation) stored in memory and the i-ACTIVSENSE warning light (amber) on after BCM replacement. This is caused by the learning value of the forward sensing camera (FSC) aiming being initialized after BCM replacement due to a software malfunction of the FSC. To correct this concern, the FSC software will be modified to not initialize the…
• 10166847Oct 24, 2019Electrical system, Engine cooling. The "FORCED IGNITION ON PROCEDURE" was made available to dealers through this service alert.
• 10166846Oct 17, 2019Equipment, Electrical system. On 7th generation vehicle (2019-2020 Mazda3 (BP) and 2020 CX-30 (DM)), when the door is opened/closed with the ignition switch off, the battery current is approximately 7A, which is three times larger than previous generation models (2.5A on Mazda6 (GL)). In addition, after the door is closed, a 6A current continues for 6 minutes on 7th generation vehicles.
• 10166845Oct 16, 2019Electrical system, Fuel system, Equipment. Some customers may experience one or both of the following: The “Next Service Date” setting under Vehicle Status Monitor in the center display changes to “Manual” by itself after being set to “Automatic” and even with the “Manual” setting in the display, the internal calculation works as if set to “Automatic”. The “Engine oil change” message is then…
• 10166843Oct 10, 2019Equipment. Some customers may experience that after starting the engine, the auto A/C blows warm air for about 10 minutes and then blows cool air as desired. This concern occurs when the ambient temperature is within a certain range (approx. 16-25 C / 61-77 F). This is caused by the control software of the Dash-Electrical Supply Unit (Dash-ESU) not being appropriate for this specific situation. To correct this concern, the…
• 10166848Oct 8, 2019Engine cooling. Some customers may complain about high engine oil consumption. Before attempting any repairs, verify the complaint by using the guideline below to determine if an engine repair is necessary:
• 10166844Oct 2, 2019Exterior lighting. Some customers may complain about an instrument cluster warning message "Auto Light System Malfunction. Turn On/Off Lights Manually". DTC B10AD:09 (Humidity sensor/solar radiation sensor/auto light sensor/rain sensor malfunction) may also be stored with the exterior light warning indicator light ON.display. This is caused by the rain sensor detecting a temperature higher than the operation range and temporarily…
• 10165676Sep 30, 2019Engine cooling. 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. Metallic debris from the old engine (with catastrophic internal mechanical failure) may rest inside the intake manifold.
• 10165654Sep 27, 2019Latches, locks and linkages, Electrical system. If the body control module (BCM) or the LF control unit (LFU) has been replaced and configuration has been performed, communication between the BCM and the LFU may not work properly due to a difference of the software level.
• 10165677Sep 25, 2019Equipment, Electrical system. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure. NOTE: Before proceeding: Confirm that the Connectivity Master Unit (CMU) is updated to the latest software version. Go to MGSS - Infotainment - MAZDA CONNECT Updates, Confirm that the customers device is updated to the latest software version. Apple Carplay/Android Auto FAQ, go to SA-001/19.
• 10165353Sep 20, 2019Engine cooling. If a customer comes in with the following concerns, contact Hotline for assistance. OIL PRESSURE WARNING light and/or the CHECK ENGINE light ON, DTC P055F and/or P0524 stored, No drivability concern or engine mechanical noise, Outside the VIN range in TSB 01-020/18.
• 10165352Sep 16, 2019Equipment, Electrical system, Visibility (wipers, defrost, mirrors), Lane…. 2019-2020 MAZDA3 SERVICE CAUTIONS FOR NEW AND REVISED FEATURES. The 2019-2020 Mazda3 has new and revised features that are different from previous models, and may be difficult to understand. This Service Alert provides valuable information to support potential dealer and customer concerns.
• 10165346Sep 11, 2019Electrical system, Equipment. Some customers may experience that after starting the engine, the auto A/C blows warm air for about 10 minutes and then blows cool air as desired. This concern occurs when the ambient temperature is within a certain range (approx. 16-25 C / 61-77 F). This is caused by the control software of the Dash-Electrical Supply Unit (Dash-ESU) not being appropriate for this specific situation. To correct this concern, the…
• 10165348Sep 5, 2019Equipment, Electrical system. Some customers may experience a warning message in the instrument cluster that says "IN-VEHICLE NETWORK MALFUNCTION" with no DTC's stored.
• 10164271Aug 23, 2019Electrical system, Equipment. 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.
• 10164270Aug 21, 2019Electrical system, Equipment. There is currently a known issue with the latest MDARS update and Mazda is working to resolve the issue. The concern is due to added functionality for the next release which can cause connection issues for some VCM-II's. Unfortunately the update cannot be stopped and MDARS cannot go back to a past version. This message will be updated when more information is available.
• 10164269Aug 20, 2019Electrical system, Equipment. 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.The key transmitter control functions (i.e. locking/unlocking door, etc.) are operational when pressing the transmitter switches, even while the key power saving function is turned ON.
• 10164075Aug 16, 2019Forward collision avoidance, Electrical system. Some vehicles may exhibit DTC U2120:00 and/or U2500:82 stored in memory and the i-ACTIVSENSE warning light (amber) ON when turning ON the ignition after any electronic control unit (ECU) is reprogramed or configured using MDARS. NOTE: ECU stands for general units (cameras and modules), all of which can be reprogrammed. This is caused by a software malfunction of the forward sensing camera (FSC). To correct this…
• 10164268Aug 14, 2019Electrical system, Equipment. 2014-2016 Mazda3 – Mazda Connect Touch Screen Concern. Warranty Extension Program – Special Service Program (SSP) B6. Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) to extend the warranty coverage for a concern regarding the Mazda Connect Center Display on certain 2014-2016 Mazda3 vehicles produced from June 11, 2013 through September 3, 2016.
• 10164048Aug 14, 2019Equipment. 2019-2020 MAZDA3 SERVICE CAUTIONS FOR NEW AND REVISED FEATURES. The 2019-2020 Mazda3 has new and revised features that are different from previous models, and may be difficult to understand. This Service Alert provides valuable information to support potential dealer and customer concerns.
• 10164051Aug 12, 2019Electrical 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.
• 10164050Aug 12, 2019Transmission and drivetrain, Engine cooling. Some customers may complain about a shift shock at 40-60 mph and/or an engine RPM increase when setting the MRCC with no DTCs are stored. This may be caused by improper PCM software.
• 10164054Aug 9, 2019Electrical system. Some customers may complain about instrument cluster warning message "Auto Light System Malfunction.Turn On/Off Lights Manually". DTC B10AD:09 (Humidity sensor/solar radiation sensor/auto light sensor/rain sensor malfunction) may be stored and the exterior light warning indicator light may be ON. This can sometimes be duplicated after the vehicle is parked under the hot sun for a period of time.
• 10164053Aug 9, 2019Electrical system. Some customer may experience all of the following when turning the ignition ON under hot weather conditions such as parking under the hot sun for some period of time: i-ACTIVSENSE warning light ON (1), Smart Brake Support (SBS) indicator light ON (2), "Excessive Camera Temp. Drive Safely" or "Safety and Driver Support Systems Temporarily Disabled" warning messages, DTC B14F9:00 stored in memory. DTC B14F9:00 cannot…
• 10163828Aug 9, 2019Forward collision avoidance, Electrical system. Some vehicles may exhibit DTC B14F0:76 [VCM] stored in memory and the i-ACTIVSENSE warning light (amber) on after BCM replacement. DTC B14F0:76 [VCM]: Forward sensing camera (FSC) deviation (i‐ACTIVSENSE warning light (amber)). This is caused by the learning value of the forward sensing camera (FSC) aiming being initialized after BCM replacement due to a software malfunction of the FSC.

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