WenmarOpen by Wenmar Pro

Service bulletins for the 2020 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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
09-020-232023-05-03. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. 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.
09-018-232023-05-03. Service bulletin. STRUCTURE:BODY:DOOR. 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.
09-007-23a2023-05-03. Service bulletin. 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.
06-001-23a2023-05-03. Service bulletin. STEERING. Some vehicles may exhibit wear/peel-off of the leather steering wheel surface causing a poor appearance. This concern may be caused by an insufficient wear resistance of the steering wheel surface.
01-006-232023-05-03. Service bulletin. ENGINE AND ENGINE COOLING. Some vehicles may exhibit oil seepage or oil leak onto the engine front cover, which becomes more apparent with dust adhesion.
SA-012-232023-04-04. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; VISIBILITY. Some customers may report an odor or water in the HVAC system and upon inspection, the cabin air filter may be found to be wet.
SA-009-23b2023-04-04. Service bulletin. LATCHES/LOCKS/LINKAGES; ENGINE AND ENGINE COOLING; EXTERIOR LIGHTING. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App Connected Vehicle enrollment. 2. Remote function(s) inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ".
SA-015-232023-04-04. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Mazda Connect Services - Frequently Asked Questions (FAQ)
SA-016-232023-04-04. Service bulletin. EQUIPMENT:ELECTRICAL. There are currently 2 methods for cutting a new auxiliary key blank. A. Auxiliary Key Trace Cut Method. B. Auxiliary Key Code Cut Method
RF-23-042023-04-04. Service bulletin. EQUIPMENT. Due to a supplier change, Channel (L) Glass BDMT-59-60ZB-> BDMT-59-60ZF has been discontinued. The new part number BDMT-59-60ZH or later has been confirmed as an interchangeable part. Slight modifications will need to be made while also using rivet 90257-4810.
eFC-1-21-00443a2023-04-04. Service bulletin. AIR BAGS. A Technical Service Bulletin (TSB 08-001 /22 - AIR BAG WARNING LIGHT ON WITH OTC B1126: 13 OR B1127:13) has been released to repair 2019-2022 Mazda3 with OTC B1126:13/B1127:13. Follow the TSB to repair the vehicle before replacing the airbag module. MC is working on a separate TSB for 2020-2022 CX-30.
09-012-23a2023-04-04. Service bulletin. SEATS. Some customers may complain that the seat warmer does not operate when turning the ignition on while the seat is warm but when turning the ignition off then on again, the seat warmer begins to operate appropriately. DTCs “B1030:13” and/or “B1032:13” are stored. This is caused by the seat warmers fail-safe mode which prevents it from working during the initial drive cycle. To correct this issue, the seat warmer has been modified to optimize the temperature control. B1030:13 Seat warmer unit (LH) circuit malfunction (Heater side), B1032:13 Seat warmer unit (RH) circuit malfunction (Heater side)
16-003-232023-04-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:INFOTAINMENT. Some customers may complain that Mazda Connect does not start (blank screen) or that it takes a long time to restart/ reboot 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 (DRAM) of the CMU has been improved.
SA-009-23a2023-04-04. Service bulletin. ENGINE AND ENGINE COOLING; LATCHES/LOCKS/LINKAGES; EXTERIOR LIGHTING; EQUIPMENT:ELECTRICAL:INFOTAINMENT. Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code (OTP) during the MyMazda App Connected Vehicle enrollment. 2. Remote function(s) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
09-007-232023-03-04. Service bulletin. 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.
SA-010-232023-03-03. Service bulletin. ENGINE AND ENGINE COOLING; VISIBILITY; EXTERIOR LIGHTING; SERVICE BRAKES, HYDRAULIC; 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.
SA-009-232023-03-03. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT; EXTERIOR LIGHTING; ENGINE AND ENGINE COOLING; ELECTRICAL 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 " ".
07-002-232023-03-03. Service bulletin. ELECTRICAL SYSTEM; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Some customers may complain that the ambient temperature on the instrument cluster is displayed more than 50 °F (10°C) lower than the actual temperature, resulting in insufficient performance of the air conditioning. This is caused by inappropriate soldering in the ambient temperature sensor. To eliminate this concern, the soldering process has been enhanced since December 2021 at the supplier.
09-014-232023-03-03. Service bulletin. STRUCTURE:BODY:DOOR; VISIBILITY. Some vehicles may experience white-streak stains appearing on the front door that look like they seeped out from under the outer mirror base. This is caused by water intruding from gaps of the outer mirror body and/or the hinge of the outer mirror, and corrosion occurring on the aluminum die-cast inner base in the outer mirror. Water, including white-salty corrosion, may drip out from gaps under the outer mirror base resulting in white stains on the front door. To eliminate this concern, the front outer mirror inner base has been modified.
09-012-232023-03-03. Service bulletin. UNKNOWN OR OTHER; SEATS. Some customers may complain that the seat warmer does not operate when turning the ignition on while the seat is warm but when turning the ignition off then on again, the seat warmer begins to operate appropriately. DTCs “B1030:13” and/or “B1032:13” are stored. This is caused by the seat warmer's fail-safe mode which prevents it from working during the initial drive cycle. To correct this issue, the seat warmer has been modified to optimize the temperature control. B1030:13 Seat warmer unit (LH) circuit malfunction (Heater side), B1032:13 Seat warmer unit (RH) circuit malfunction (Heater side)
01-005-232023-03-03. Service bulletin. ENGINE AND 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. NOTE: Vehicles with SKYACTIV-G 2.5T are not applicable. If DTC P2B61:00 (Coolant control valve circuit range/performance) accompanies DTC P0126:00, this TSB is not applicable. Diagnose according to the instructions on MGSS online. Due to production variety of the failsafe thermostat integrated in the coolant control valve, engine coolant may enter into a dry hollow in the failsafe thermostat, resulting in unintended opening of the failsafe thermostat at lower temperatures (104-176 °F (40-80 °C)). To eliminate this concern, the production process of the coolant control valve has been modified.
01-004-232023-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Some vehicles may have the check engine light on with DTC P0524:00 or P055F:00 stored in memory. Contamination in the engine oil may cause the engine oil solenoid valve to become stuck, resulting in improper operation of the oil pump and improper oil pressure. DTC P0524:00 (Engine oil pressure too low), DTC P055F:00 (Engine oil pressure malfunction). The control software of the PCM has been modified to eliminate this concern. In addition, the production process has been modified to reduce contamination in the engine oil solenoid valve, oil pump, spacer and oil filter.
01-001-23a2023-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Some customers may complain about a poor acceleration and rough idling or the CHECK ENGINE light ON with DTC P0301:00, P0302:00, P0303:00, P0304:00.NOTE: Only turbo engines are applicable; non-turbo engines are NOT applicable. In most cases, DTCs P030X stores, but sometimes not. Sometimes the CHECK ENGINE light does not recognize this engine concern. This is caused by the variable valve in the exhaust manifold seizing and causing the exhaust port to become hot and the exhaust valve seat to wear unevenly, resulting in compression leakage. To eliminate this concern, the design of the exhaust manifold has been modified.
09-006-232023-02-02. Service bulletin. STRUCTURE. When encountering a vehicle with paint damage, refer to the "Mazda Paint Warranty Guide" to determine cause, prevention, remedy, and warranty coverage (if applicable).
09-004-232023-02-02. Service bulletin. LATCHES/LOCKS/LINKAGES. Some customers may experience that after the doors are locked and the Fuel Door Lock Delay with MAZDA CONNECT has passed (default setting is 90 seconds), the fuel-filler lid does not lock and can be opened when pressing it. NOTE: - The fuel-filler lid does not lock immediately after the doors are locked, but after the time set in the Fuel Door Lock Delay (0, 30, 60, 90, and 120 seconds). - Although the root cause has not been identified, the vehicle should be repaired by adjusting the fuel-filler lid opener cable position when there is a customer complaint.

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