BULLETIN NOTES
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red.
Previous TSBs:

Date(s) Issued:

01-009/21

04/12/21

APPLICABLE MODEL(S)/VINS
2019-2020 Mazda3 (Japan built) US spec (2.5L w/cylinder deactivation) with VINS lower than JM1BP**M***176406
(produced before April 3, 2020)
2019-2021 Mazda3 (Mexico built) US spec (2.5L w/cylinder deactivation) with VINS lower than 3MZBP**M***210134
(produced before December 24, 2020)
2020-2021 CX-30 US spec (non-turbo w/cylinder deactivation) with VINS lower then 3MVDM**M***239820 (produced
before December 24, 2020)
2022 MX-30 with VINS lower than JM1DR**B***101083 (produced before June 2, 2022)
DESCRIPTION
Some vehicles may exhibit the following symptoms with DTC P05A0:00 (Active air shutter and the opening angle
abnormality (sticking)) stored in memory.
Symptom 1 [Mazda3 and CX-30]: The active air shutter is working, but DTC P05A0:00 is stored in memory.
Cause 1: This is caused by improper control software of the PCM detecting the DTC immediately without performing the
failsafe operation. When the active air shutter detects unusual torque, it is designed to repeat the open/close cycles up to
three times as a failsafe to try to remove the object(s) which temporarily disturbed the movement.
Symptom 2 [Mazda3, CX-30 and MX-30]: The active air shutter is frozen by snow and/or ice under freezing
temperatures with DTC P05A0:00 stored in memory.
Cause 2 [Mazda3 and CX-30]: When a temporary blocking of the active air shutter is expected to be caused by snow
and/or ice and the intake air temperature is above the freezing point, DTC P05A0:00 may be unintentionally detected.
[MX-30]: When a temporary blocking of the active air shutter is expected to be caused by snow and/or ice and the heater
is turned on, DTC P05A0:00 may be unintentionally detected.

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To eliminate this concern:
• [For Symptom 1] The control software of the PCM has been modified.
• [For Symptom 2] The control software of the PCM has been modified to use the ambient temperature sensor
instead of the intake air temperature sensor to detect freezing environment properly (Mazda3 and CX-30) and the
control software of the PCM has been modified not to use the heater status (MX-30).
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify the customer concern.
NOTE: If nothing is found disturbing the movement of the active air shutter, the DTC most likely was caused by an
incoming object which temporally disturbed the movement. DO NOT replace the active air shutter.
2. Reprogram the PCM with the Mazda Modular Diagnostic System (M-MDS), using the Mazda Diagnostic And Repair
Software (MDARS). Refer to MDARS ECU Reprogramming Procedure.
NOTE:
• If the current calibration file name in the ECU FILENAME screen is the same as shown in the Calibration Files
Information or with a later suffix, reprogramming is not necessary.
• For Mazda3 and CX-30:
After the reprogramming, pending DTC P2610:00 [PCM] may be stored without the CHECK ENGINE light
ON. Since this DTC may turn to a current DTC depending on operations after the reprogramming, clear
DTC after all repair work done.
If DTC U2120:00 or/and U2500:82 are stored and i-ACTIVSENSE warning light (amber) turns on after the
reprogramming, refer to SA-043/20.
If the Welcome Lamp function is accidently activated while using MDARS, it may also cause this concern.
Check and correct as necessary. Refer to the SA-054/20 for details.
○

○

○

3. Clear the DTC, turn the ignition off, and get out of the vehicle.
4. Close and lock the door then wait for at least ten minutes.
5. [Mazda3 and CX-30]: Verify the repair by starting the engine and confirming there is no check engine light or
abnormal warning lights present.
[MX-30]: Verify the repair by turning the power ON (READY on) and confirming there is no abnormal warning lights
present.
NOTE:
• If any DTC should remain after performing a DTC erase, diagnose the DTC according to the instructions on
MGSS.
• [MX-30]: This reprogramming may change the electronic sound setting (ON/OFF). If it has changed, confirm the
customer's preference and change the setting accordingly, refer to TSB 30-002/21 for details.

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CALIBRATION
Mazda3 (Japan built)
Engine

Transmission

Drive
2WD

AT
2.5L
(w/cylinder deactivation)

4WD

MT

2WD

Transmission

Drive

File Name

Note

PX05-188K2-S

Mitsubishi

PX06-188K2-S

Denso

PX07-188K2-U

Mitsubishi

PX08-188K2-U

Denso

PX58-188K2-R

Mitsubishi

PX59-188K2-R

Denso

File Name

Note

PX13-188K2-L

Mitsubishi

PX14-188K2-L

Denso

PX15-188K2-L

Mitsubishi

PX16-188K2-L

Denso

File Name

Note

PXH7-188K2-J

Mitsubishi

PXH8-188K2-J

Denso

PXJ9-188K2-J

Mitsubishi

PXK1-188K2-J

Denso

Mazda3 (Mexico built)
Engine

2WD
2.5L
(w/cylinder deactivation)

AT
4WD

CX-30
Engine

Transmission

Drive
2WD

2.5L
(w/cylinder deactivation)

AT
4WD

MX-30
Model

File Name

MX-30

MH08-186K2-K

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WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
• This repair will be covered under Federal Emissions Warranty.
• Additional diagnostic time cannot be claimed for this repair.
Warranty Type

A

Symptom Code

64

Damage Code

9W

Part Number Main Cause
Quantity
Operation Number / Labor Hours:

5555-18-881
0
XXS7AXFX / 0.3 Hrs. (Symptom 1)
XXW4GXFX / 0.3 Hrs. (Symptom 2)

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