# Service bulletin MT\-002\-21

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.

- Type: Service bulletin
- NHTSA id: 10194659
- Published by NHTSA: 2021\-06\-01
- Manufacturer's number: MT\-002\-21
- Manufacturer's date: 2021\-05\-07
- NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING

## NHTSA's summary

When programming a key or installing a Genuine Mazda Accessory Remote Engine Start system, you may encounter programming difficulty. This may be caused by a customer installed aftermarket decorative trim and/or cover on the START/STOP ENGINE button. The aftermarket accessory may create electrical interference, which may interfere with programming.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194659-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194659-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine, Equipment and accessories

## Vehicles listed

- 2016 to 2021 MAZDA CX\-3
- 2020 to 2021 MAZDA CX\-30
- 2013 to 2021 MAZDA CX\-5
- 2007 to 2021 MAZDA CX\-9
- 2010 to 2021 MAZDA MAZDA3
- 2009 to 2021 MAZDA MAZDA6
- 2016 to 2021 MAZDA MX\-5

## Recalls for the same vehicles and component

- [2019322](/recalls/tc/2019322.md), 2019-06-27: Engine
- [19V497000](/recalls/nhtsa/19V497000.md), 2019-06-27: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ENGINE
- [19V403000](/recalls/nhtsa/19V403000.md), 2019-05-30: ELECTRICAL SYSTEM:WIRING
- [19V363000](/recalls/nhtsa/19V363000.md), 2019-05-14: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; SEAT BELTS:FRONT:WARNING LIGHT/DEVICES
- [17V745000](/recalls/nhtsa/17V745000.md), 2017-11-21: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
- [17V744000](/recalls/nhtsa/17V744000.md), 2017-11-21: TRAILER HITCHES; ELECTRICAL SYSTEM:WIRING
- [2017427](/recalls/tc/2017427.md), 2017-09-01: Electrical
- [2014113](/recalls/tc/2014113.md), 2014-04-07: Electrical
- [14V173000](/recalls/nhtsa/14V173000.md), 2014-04-03: ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR
- [2009113](/recalls/tc/2009113.md), 2009-04-16: Electrical

## Other bulletins for the same vehicles and component

- [SA\-042\-26a](/bulletins/11037900.md), 2026-10-03, Service bulletin: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. Mazda Connected Services \- Frequently Asked Questions \(FAQ\) This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text. SA\-042/26 06/30/26 DESCRIPTION Frequently Asked Questions \(FAQ\) Index General Questions MAZDA CONNECT Indication Setup and Getting Started Dealer Processes Registration / Enrollment / Take\-Over Customer Subscription Status WI\-FI General Informatio Opening the TCU Communication Line WI\-FI How\-To Conditions for Remote Engine Start Will Not Function WI\-FI Trial Period Conditions for Remote Engine Start Function Will turn engine OFF Interacting With The App TCU Communication Line Status Service Issues Educational Videos Troubleshooting Resources MyMazda App Error Codes Customer Opt\-Out
- [SA\-041\-26a](/bulletins/11037899.md), 2026-10-03, Service bulletin: ELECTRICAL SYSTEM. DESCRIPTION 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 MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices. Examples: 1. Devices connected to the DLC\-2 \(battery discharge/DTC stored\) 2. Devices plugged into the 12V outlet 3. GPS tracking device \(engine no start/battery discharge\) 4. Dash cam \(DTC stored\) 5. Non\-certified USB cable \(Apple Carplay™/ Android Auto™ will not connect\) 6. Over\-sized wheels/tires \(incorrect GPS location\) 7. DTC C0023:14 8. Decorative trim and/or cover on the START/STOP ENGINE button
- [SA\-038\-26b](/bulletins/11037634.md), 2026-10-01, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM. This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA\-038/26 08/18/26 and 06/15/26 DESCRIPTION Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code \(OTP\) during the MyMazda App
- [SA\-039\-26a](/bulletins/11037019.md), 2026-09-04, Service bulletin: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. This Service Alert supersedes the previously issued SA\(s\) listed below. The changes are noted in Red text. SA\-039/26 06/15/26 Mazda Connect Symptom Troubleshooting DESCRIPTION Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
- [SA\-038\-26a](/bulletins/11037018.md), 2026-09-04, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM; ENGINE; EXTERIOR LIGHTING. This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA\-038/26 06/15/26 DESCRIPTION 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 functions inoperative. Engine Start / Stop Door Lock / Unlock Lights ON / OFF Climate Control 3. MAZDA CONNECT connected vehicle reception strength icon shows "X" or " ". Index MAZDA CONNECT 2 Center Display Status Icon MAZDA CONNECT 3 Center Display Status Icon Remote Engine Start Will Not Function Remote Engine Start Function Will turn engine OFF Customer Subscription Status TCU Communication Line Status
- [SA\-054\-26](/bulletins/11037012.md), 2026-09-04, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM. This Service Alert supersedes the previously issued Service Alerts listed below: The changes are noted in Red. Infotainment Reboot With Navigation Card Installed This Service Information is no longer valid. Refer to the following updated Technical Service Bulletins: CX\-5 / CX\-9: 16\-002/23 \- UPDATED SOFTWARE RELEASE FOR CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM \(7TH GEN TYPE\) Mazda3 / CX\-30 \(Non\-Turbo\): 16\-008/23 \- UPDATED SOFTWARE RELEASE FOR CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM Mazda3 / CX\-30 \(Turbo\): 16\-007/23 \- UPDATED SOFTWARE RELEASE FOR CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM
- [SA\-053\-26](/bulletins/11037011.md), 2026-09-04, Service bulletin: ELECTRICAL SYSTEM; WHEELS. This Service Alert supersedes the previously issued bulletin\(s\) listed below. The changes are noted in Red text. SA\-006/23 01/23/23 DESCRIPTION Some customers may complain about the infotainment system and/or the MyMazda App showing incorrect clock and/or tire pressures and/or tire pressure missing. This may be caused by: Incorrect calendar entry \(month/day/year\) after a battery disconnect Infotainment system software update. BCM TPMS unlearn during vehicle storage or transport. Wheel/Tire change REPAIR PROCEDURE This can be corrected by the customer driving the vehicle for a day or two so that the following will occur.
- [01\-010\-26](/bulletins/11036688.md), 2026-09-02, Service bulletin: ENGINE. This bulletin supersedes the previously issued bulletin\(s\) listed below. The changes are noted in Red text. 01\-012/22 10/06/22 DESCRIPTION Some vehicles may exhibit accumulation of dried coolant \(1\) around the water pipe \(2\). This is caused by a gap between the housing and pipe due to a press fitting during the manufacturing process. The accumulated coolant is solidified and plugs the gap in high temperature environment and the seepage is stopped and does not progress. This is normal and does not require a part replacement, clean off the dried coolant from around the pipe with a wire brush. REPAIR PROCEDURE 1. Verify the customer concern. 2. If the above condition is experienced, remove the accumulated coolant around the pipe \(1\) with a wire brush etc. NOTE: Perform the procedure on the vehicle. No need to remove the water pipe and hoses.
- [09\-022\-26](/bulletins/11035599.md), 2026-08-04, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. This bulletin supersedes the previously issued bulletin\(s\) listed below. The changes are noted in Red text. 09\-042/04 12/10/04 DESCRIPTION Some vehicles may exhibit inoperative electric rear window defroster grid lines, integral antenna concerns causing radio reception issues or terminal tabs pulled from the rear window glass. Follow the diagnostic and repair procedures included in this service information to inspect and service rear defroster grid lines, integral antenna concerns or broken terminal tabs.
- [06\-001\-26](/bulletins/11035595.md), 2026-08-04, Service bulletin: STEERING; ELECTRICAL SYSTEM. DESCRIPTION Some customers may complain that the electric power steering warning light illuminates after engine start and DTC U2011:1C is stored. Zinc\-plated whisker may form inside the EPS motor and trigger the DTC. However, since it is cleared when power is supplied during DTC detection, normal operation can be restored by turning the ignition OFF and then ON. Furthermore, there is no possibility of recurrence. This case may be resolved through a simple inspection or repair without the need for parts replacement, potentially avoiding unnecessary customer waiting time.

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