# Service bulletin SA\-005\-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: 10186807
- Published by NHTSA: 2021\-02\-06
- Manufacturer's number: SA\-005\-21
- Manufacturer's date: 2021\-01\-19
- NHTSA component: SERVICE BRAKES, HYDRAULIC; UNKNOWN OR OTHER; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY

## NHTSA's summary

Some vehicles may have a "Low Battery Risk. Start Vehicle to Charge 12V Battery" warning message in the instrument cluster and a 30 second alarm sound. This may be caused by the customer doing any one of the following several times without starting the engine for an extended period of time: Open any door\(s\), Unlock doors, Open liftgate, Depress brake pedal, Push start/stop button. No dealer visit is required. The warning message can be cleared by starting the engine and idling or driving for 5 minutes or longer.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186807-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186807-9999.pdf)

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

## Components

Brakes, Equipment and accessories

## Vehicles listed

- 2021 MAZDA CX\-30
- 2021 MAZDA MAZDA3

## Other bulletins for the same vehicles and component

- [SA\-029\-26](/bulletins/11032103.md), 2026-05-05, Service bulletin: UNKNOWN OR OTHER; ENGINE; POWER TRAIN; SERVICE BRAKES. This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA\-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all major vehicle systems. Mazda recommends dealers follow the scheduled maintenance tables as cited in the vehicle\-specific workshop manual or owner's manual. Services performed outside of Mazda's factory scheduled maintenance are not recommended. These services are unnecessary and create unneeded expenses for your customers. SCHEDULED MAINTENANCE Refer to the applicable Workshop Manual or Owner's Manual for vehicle \-specific manufacturer scheduled maintenance. Workshop Manual \- Refer to section 00\-00 SCHEDULED MAINTENANCE. Owner's Manual \- Refer to section 8 Maintenance and Care. b. Note: Please refer to the information below outlining the services not included in Mazda's Factory Scheduled Maintenance: IMPORTANT: Recommending fluid flushes when not necessary can lead to customer confusion and dissatisfaction. Fluid flushing for preventive maintenance purposes is strongly discouraged, unless otherwise specified in a published procedure \(Owner’s Manual, Workshop Manual, Technical Service Bulletin, etc.\).
- [SA\-055\-25](/bulletins/11026353.md), 2025-12-05, Service bulletin: SERVICE BRAKES. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern. NOTE: Before following this Service Alert repair procedure, ensure published TSBs in MGSS have been completed per model year.
- [SA\-016\-24c](/bulletins/11009644.md), 2024-11-04, Service bulletin: SERVICE BRAKES. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern.
- [SA\-007\-24b](/bulletins/11008430.md), 2024-10-04, Service bulletin: SERVICE BRAKES. 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.
- [04\-001\-24b](/bulletins/11008429.md), 2024-10-04, Service bulletin: SERVICE BRAKES. Symptom 1: Some customers may complain about hearing a grinding noise and/or vibration occur when applying the brake. This is due to rust on the rear brake disc plate. The brake pad has insufficient disc\-rust prevention performance, resulting in the disc plate rusting. To eliminate this concern, the pad material has been improved to prevent rust on the disc surface. Symptom 2: Some vehicles may exhibit a squeal noise from the rear brakes when braking lightly while driving at a slow speed. The squeal noise is caused by the disc pad surface fluctuating. To eliminate this concern, the brake pads have been modified.
- [SA\-016\-24b](/bulletins/11007009.md), 2024-09-04, Service bulletin: SERVICE BRAKES. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern.
- [04\-001\-24a](/bulletins/11006982.md), 2024-09-04, Service bulletin: SERVICE BRAKES. Symptom 1: Some customers may complain about hearing a grinding noise and/or vibration occur when applying the brake. This is due to rust on the rear brake disc plate. The brake pad has insufficient disc\-rust prevention performance, resulting in the disc plate rusting. To eliminate this concern, the pad material has been improved to prevent rust on the disc surface. Symptom 2: Some vehicles may exhibit a squeal noise from the rear brakes when braking lightly while driving at a slow speed. The squeal noise is caused by the disc pad surface fluctuating.
- [SA\-016\-24a](/bulletins/11003396.md), 2024-07-05, Other: SERVICE BRAKES. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern.
- [SA\-007\-24a](/bulletins/10254185.md), 2024-05-04, Service bulletin: SERVICE BRAKES, HYDRAULIC; FORWARD COLLISION AVOIDANCE; EQUIPMENT ADAPTIVE/MOBILITY. 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.
- [SA\-021\-24](/bulletins/10254095.md), 2024-05-03, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE; ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:INFOTAINMENT. Some customers may complain about intermittent audio no sound from the MAZDA CONNECT infotainment system and/or static noise from the speakers. The concern may be reproduced by tapping on the dash pad near the MAZDA CONNECT center display and the following DTC's may be stored. U0186:08 Communication error with audio amplifier U2145:08 Communication error with remote tuner \(RT\) U2145:02 Communication error with remote tuner \(RT\)

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