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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
SA-053-202020-07-03. Service bulletin. POWER TRAIN. 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 to re-install the original plug from the old transmission.
SA-046-20a2020-07-03. Service bulletin. LANE DEPARTURE: SENSING SYSTEM: CAMERA; VISIBILITY; FORWARD COLLISION AVOIDANCE: SENSING SYSTEM: CAMERA. 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).
SA-031-20e2020-07-03. Service bulletin. EQUIPMENT:ELECTRICAL. 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.
SA-029-20e2020-07-03. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM. 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. 1 malfunction • B119F:13 (TCU - TEL antenna No.1 circuit malfunction) • B119F:2B (CMU - GPS antenna signal circuit malfunction) • B1252:87 TCU - Communication error with connectivity master unit (CMU) • U0156:00 VCM - communication error with connectivity master unit (CMU) • U0156:00 BCM - Communication error with connectivity master unit (CMU) • U0198:00 BCM - Communication error with emergency call unit • U212D:00 BCM - Communication error with light control module (RH) • U3000:00 TCU - Telematics communication unit internal malfunction • Low Voltage Battery DTCs
SA-029-20d2020-07-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. 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. 1 malfunction • B119F:13 (TCU - TEL antenna No.1 circuit malfunction) • B119F:2B (CMU - GPS antenna signal circuit malfunction) • B1252:87 TCU - Communication error with connectivity master unit (CMU) • U0156:00 VCM - communication error with connectivity master unit (CMU) • U0156:00 BCM - Communication error with connectivity master unit (CMU) • U0198:00 BCM - Communication error with emergency call unit • U212D:00 BCM - Communication error with light control module (RH) • U3000:00 TCU - Telematics communication unit internal malfunction • Low Voltage Battery DTCs
SA-0290-20c2020-07-03. Service bulletin. EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM:SOFTWARE. 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. 1 malfunction • B1252:87 TCU - Communication error with connectivity master unit (CMU) • U0156:00 VCM - communication error with connectivity master unit (CMU) • U0156:00 BCM - Communication error with connectivity master unit (CMU) • U0198:00 BCM - Communication error with emergency call unit • U212D:00 BCM - Communication error with light control module (RH) • U3000:00 TCU - Telematics communication unit internal malfunction • Low Voltage Battery DTCs
SA-027-20b2020-07-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL. 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. Any updates to the service will be announced at the appropriate time.”Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
SA-010-20d2020-07-03. Service bulletin. EQUIPMENT:ELECTRICAL. 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 return to the dealer for repairs.
SA-010-20c2020-07-03. Service bulletin. EQUIPMENT. 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 return to the dealer for repairs.
09-021-20-37142020-07-02. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING 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). This concern may be caused by incoming noise disturbing the reception of GPS signals, resulting in the wrong vehicle location and the DTC stored. To eliminate this concern, the GPS antenna has been modified.
05-002-20-37042020-07-02. Service bulletin. ENGINE; POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. 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.
01-004-20-3684a2020-07-02. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE. 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 false error under low voltage during cranking.
CSP042020-06-02. Service bulletin. EQUIPMENT. Customer Service Program (CSP)04 - Connected Services Deactivated - 2020 CX-30 and Mazda3.
SA-007-20g2020-06-02. Service bulletin. ELECTRICAL 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
SA-007-20f2020-06-02. Service bulletin. ELECTRICAL 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
SA-052-202020-06-02. Service bulletin. POWER TRAIN. 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.
SA-050-202020-06-02. Service bulletin. FORWARD COLLISION AVOIDANCE: SENSING SYSTEM: RADAR. 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.
SA-031-20d2020-06-02. Service bulletin. EQUIPMENT:ELECTRICAL. 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
SA-012-20d2020-06-02. Service bulletin. EQUIPMENT. 2019-2020 MAZDA3 SERVICE CAUTIONS FOR NEW AND REVISED FEATURES: Connected Vehicle, Connected Vehicle Maintenance Mode, Mazda Connected Vehicle Viewer (MCVV).
SA-010-20b2020-06-02. Service bulletin. EQUIPMENT; 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 return to the dealer for repairs.
SA-004-20a2020-06-02. Service bulletin. EQUIPMENT. 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.
SA-048-202020-05-05. Service bulletin. EQUIPMENT; ENGINE AND 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.
SA-046-202020-05-05. Service bulletin. LANE DEPARTURE; EQUIPMENT ADAPTIVE/MOBILITY; FORWARD COLLISION AVOIDANCE; VISIBILITY. 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).
SA-044-202020-05-05. Service bulletin. WHEELS. Some vehicles may display incorrect tire pressures in MAZDA CONNECT. This may be caused by an incorrect calendar entry (month/day/year) after a battery disconnect or infotainment system software update.
SA-043-202020-05-05. Service bulletin. FORWARD COLLISION AVOIDANCE; EQUIPMENT ADAPTIVE/MOBILITY. 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.

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