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.

• 10219228Aug 25, 2022Electrical system. 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. - Remote function(s) inoperative. - Engine Start / Stop - Door Lock / Unlock - Lights ON / OFF - MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Confirm the customer's phone and vehicle have good to strong…
• 10218766Aug 24, 2022Electrical system. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7000C0A-NA01_12002 or later).
• 10218777Aug 23, 2022Body and structure. Some customers will report that their fuel door was stuck closed and would not open to refuel the vehicle. Follow the repair steps below unless the conditions outlined in TSB 09-019/21 - FUEL-FILLER LID PANEL IS DEFORMED are present.
• 10218737Aug 23, 2022Electrical system. Some customers may complain about a fuel gauge that fluctuates to a higher level at a stop on inclines, even after a long drive since it was fully refilled. This is caused by improper control software of the body control module (BCM). To eliminate this concern, the control software of the BCM has been modified.
• 10218723Aug 23, 2022Electrical system. 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.
• 10218775Aug 17, 2022Suspension. Some vehicles may exhibit a rattle noise from the front suspension when driving over bumps or on a road with a wavy surface
• 10218772Aug 11, 2022Equipment. This information will give you the necessary knowledge to respond to customers concerns of Smart Brake Support (SBS) unintended braking. By educating the customer on the system operation, it should reduce their anxiety or distrust of the vehicle.
• 10218768Aug 11, 2022Electrical system. Some customers may complain that Mazda Connect does not start or that it takes a long time to restart after starting the vehicle. This is caused by the initialization process with the CMU failing at startup due to a defective circuit board element. To eliminate this concern, the internal hardware of the CMU has been improved.
• 10218725Aug 10, 2022Air bags. Some vehicles may exhibit that the air bag warning light turns on or repeats cycles of turning on and off with DTC B1126:13 and/or B1127:13 stored in memory.
• 10218731Aug 9, 2022Body and structure. Some vehicles may exhibit the glass run channel of the front door interfering with the rear door garnish. This is caused by the front door glass run channel not being fixed strongly enough to the door for the following situations where the cycles of door operation may result in interference and lead to damage on the rear door garnish. - When the front door glass is closed, the glass run channel may be forced to…
• 10218727Aug 8, 2022Latches, locks and linkages. Some CX-5 and CX-30 customers may find that the liftgate does not close when pressing the power liftgate (PLG) rear switch located on the interior liftgate trim. This may be caused by PLG switch corrosion. Water from a high pressure car washer and/or condensation may drip onto the switch connector and cause corrosion. To eliminate this concern, the PLG rear switch has been modified with a waterproof connector.
• 10218730Aug 3, 2022Electrical system. When replacing the body control module (BCM), some ECUs may need reprogramming. Without reprogramming the concerned ECUs, the power saving function may not work properly.
• 10218770Aug 1, 2022Visibility (wipers, defrost, mirrors). Some customers may complain that their interior rear view mirror fell off and/or will not stay in place after it is reinstalled. This is due to some mirrors having lower tension on the retaining clips. To eliminate this concern, there was a change in production
• 10218728Aug 1, 2022Equipment. Some vehicles may exhibit a rear console lid with a sticking feeling or a squeaking noise when opening and/or closing. This is caused by an inappropriate shape of the console lid hinge pin where the position of the hinge pin (1) becomes misaligned when the rear console lid is repeatedly opened and closed. When parts around the hinge pin thermally expand, the result creates a gap in the hinge of the rear console lid.
• 10218719Aug 1, 2022Latches, locks and linkages. Some customers may complain that their liftgate does not open. This can mean a range of things, from the liftgate not unlatching to the power liftgate (PLG) not opening automatically. If you confirm that the customer's concern is that the liftgate does not unlatch correctly, follow the repair information below
• 10218684Aug 1, 2022Brakes. A customer may complain that they have a brake squeal at the rear brakes.
• 10217205Jul 27, 2022Equipment. Some vehicles may exhibit the trim peeling off the EPB (Electronic Parking Brake) or power window switches.
• 10215253Jun 27, 2022Equipment, 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 are met: 1.
• 10215274Jun 22, 2022Electrical system. 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.
• 10222571Jun 14, 2022Latches, locks and linkages. Some vehicles may exhibit the fuel-filler or charge lid opening unintentionally when unlocking the front doors using the door lock switch, the touch sensor on the outer door handle, or the remote transmitter. This is caused by a mechanical issue at the actuator of the fuel-filler/charge lid (when the fuel filler/charge lid is pushed hard, the guide pin in the actuator comes off). To eliminate this concern, the…
• 10215302Jun 14, 2022Steering. Some vehicle may exhibit a knocking noise from the steering column while driving. This may be caused by a gap between the intermediate shaft (upper side) and the joint bolt. To eliminate this concern, the intermediate shaft and the joint bolts have been modified to reduce backlash.
• 10215244Jun 10, 2022Equipment, Electrical system, Other or unknown. Some customers may complain about scratches on the instrument cluster lens.
• 10215355Jun 9, 2022Body and structure, Equipment. Some vehicles may have rust on the contact parts between the clips (for attaching the roof molding) and the roof panel (ditches of the roof rail). This is caused by the gap between the roof molding attachment clips and the roof panel not being wide enough to allow paint to be appropriately applied to the roof panel. To eliminate this concern, the shape of the roof molding clip has been changed to enable paint…
• 10215015Jun 9, 2022Electrical system. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
• 10215238Jun 7, 2022Transmission and drivetrain. Service part Automatic Transaxles (ATX) manufactured on or after July, 2018 are shipped with a blank TCM that requires configuration.
• 10215362Jun 1, 2022Electrical system, Equipment. Some vehicles may exhibit the warning messages "Safety and Driver Support Systems Temporarily Disabled" or "Front Radar Obscured.
• 10213202May 27, 2022Electrical system. Some customers may experience one or both of the following symptoms while locking and unlocking the doors works fine using the remote transmitter. * Symptom 1: The touch sensor of the front door outer handle does not lock the doors after rain and/or car washing, even though unlocking is possible. * Symptom 2: The touch sensor of the front door outer handle does not unlock the doors.
• 10213185May 24, 2022Suspension. Some customers may complain of signs of oil on the struts or shock absorbers. In most cases the oil that is present is normal, and a result of the oil that remains on the shaft during the normal sweeping process of the shaft seal. Follow the inspection guidelines below to determine if the condition is a result of the normal sweeping process or a failure of the shaft seal.
• 10213148May 20, 2022Electrical system. 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.
• 10213206May 18, 2022Electrical system. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7000C0A-NA01_12002 or later).
• 10213125May 12, 2022Electrical system, Other or unknown. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
• 10213140May 6, 2022Other or unknown. Mazda Connected Services Frequently Asked Questions (FAQs)
• 10213139May 6, 2022Exterior lighting, Electrical system, Latches, locks and linkages, Equipment. 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. **Remote function(s) inoperative. **Engine Start / Stop **Door Lock / Unlock **Lights ON / OFF *MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Confirm the customer's phone and vehicle have good to strong reception…
• 10213204May 4, 2022Electrical system. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7000C0A-NA01_12002 or later).
• 10213194May 2, 2022Air bags. Some vehicles may exhibit that the air bag warning light turns on or repeats cycles of turning on and off with DTC B1126:13 and/or B1127:13 stored in memory.
• 10213142May 2, 2022Electrical system, Equipment. Qi Wireless Charger Symptom Troubleshooting
• 10210938Apr 29, 2022Body and structure, Equipment. Some vehicles may have rust on the contact parts between the clips (for attaching the roof molding) and the roof panel (ditches of the roof rail). This is caused by the gap between the roof molding attachment clips and the roof panel not being wide enough to allow paint to be appropriately applied to the roof panel. To eliminate this concern, the shape of the roof molding clip has been changed to enable paint…
• 10210887Apr 27, 2022Electrical system, Equipment. Apple CarPlay / Android Auto Frequently Asked Questions (FAQs)
• 10210886Apr 27, 2022Electrical system. Some customers may experience infotainment door rattle noise. Follow the repair procedure to help determine the cause.
• 10210885Apr 27, 2022Electrical system. Some customers may experience an infotainment sub-woofer rattle noise. Follow the repair procedure to help determine the cause.
• 10210880Apr 20, 2022Equipment, Electrical system. Some customers may complain about the following symptoms occurring when driving without anything ahead (no metallic object reflects the radar wave such as a vehicle ahead, an oncoming vehicle, a road sign or a guard rail). *While using Mazda Radar Cruise Control (MRCC), the MRCC cancels by itself. NOTE: The customer may misinterpret MRCC cancellation as unintended braking. MRCC cancellation feels the same as the…
• 10210936Apr 19, 2022Latches, locks and linkages, Body and structure. Some vehicles may exhibit corrosion on the liftgate lock striker. This may be caused by water penetrating from micro cracks existing on the lock striker's coating surface that reacts with zinc contained in the undercoating and produces the corrosion. To eliminate this concern, a modified undercoating has been established for the liftgate lock striker.
• 10210935Apr 12, 2022Body and structure, Equipment. Some vehicles may exhibit that the glass run channel of the front door interferes with the rear door garnish. Since the front door glass run channel is not fixed to the door strongly enough for the following situations, cycles of door operation may result in interference and lead to damage on the seal rubber at the rear door. *When the front door glass is closed, the glass run channel may be forced to move to the B…
• 10210934Apr 12, 2022Body and structure, Equipment. Some customers may complain that the clip on the rear end of the rear beltline molding is loose and the molding is slightly lifted up. Due to the poor shape of the clip claws, the fitting force to the door body may decrease while in use. To eliminate this concern, the clip has been enlarged in the horizontal direction to improve the fitting force against the door body.
• 10210933Apr 8, 2022Equipment, Seats. At PDI or when new vehicle is delivered, some customers may complain about wrinkles on the leather seat cushion and/or seat back surface. Customers having this concern should have their vehicle repaired by a qualified upholstery repair specialist using the following repair procedure.
• 10210879Apr 6, 2022Electrical system. Mazda Connected Services Frequently Asked Questions (FAQ).
• 10210867Apr 6, 2022Engine cooling. The WSM shows 3 possible crankshaft sprocket and timing chain combinations (Type A, B and C), but some vehicles have been produced with a combination of Type A timing chain with 2 yellow-colored links with a Type B crankshaft sprocket.
• 10210902Apr 5, 2022Steering. Some customers may complain that the steering wheel is off center more than 3° even when driving straight on a flat road.
• 10210865Apr 4, 2022Electrical system. 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. *Remote function(s) inoperative. *Engine Start / Stop **Door Lock / Unlock **Lights ON / OFF *MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Confirm the customer's phone and vehicle have good to strong reception…
• 10210847Apr 4, 2022Equipment. There are currently 2 methods for cutting a new auxiliary key blank. A. Auxiliary Key Trace Cut Method B. Auxiliary Key Code Cut Method

← All problems reported for the 2020 Mazda MAZDA3