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

Date(s) Issued

05-003/20
05-004/19
05-004/18
05-005/16

07/09/20
05/20/19
04/16/18
07/07/16

05-002/15

12/03/15, 10/07/15, 05/27/15, 04/24/15, 03/30/15, 03/26/15
and 03/10/15

05-005/14

04/29/14, 04/09/14, 03/28/14, and 3/25/14

05-003/14

04/04/14 and 02/21/14

05-005/13

109/23/13, 9/25/13,12/16/13, and 12/17/13

APPLICABLE MODEL(S)/VINS

•
•
•
•
•
•

2012-2018 Mazda3 with SKYACTIV 6AT
2013-2021 CX-5 with SKYACTIV 6AT
2014-2021 Mazda6 with SKYACTIV 6AT
2016-2021 Mazda2 (Mexico/Puerto Rico spec) with SKYACTIV 6AT
2016-2021 CX-3 with SKYACTIV 6AT
2016-2021 CX-9 with SKYACTIV 6AT

DESCRIPTION
Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of
these DTCs stored in the TCM memory (P0842, P0847, P0872, P0877, P0780, P1738).
• P0842:00 - Oil pressure switch No. 1 (oil pressure switch B) stuck on
• P0847:00 - Oil pressure switch No. 2 (oil pressure switch A) stuck on
• P0872:00 - Oil pressure switch No. 3 (oil pressure switch A) stuck on

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• P0877:00 - Oil pressure switch No. 4 (oil pressure switch B) stuck on
• P0780:00 - Gear shifting malfunction
• P1738:00 Automatic transaxle internal malfunction
This is caused by the oil pressure switch A and/or B at the control valve body temporarily or permanently getting stuck
due to contamination entering the passage. To correct the problem, some mass production changes have been
implemented to reduce contamination and improve the DTC diagnostic logic.
NOTE: If the vehicle also has a delayed engagement concern, this TSB is not applicable. Refer to the instructions on
MGSS (SLOW ENGAGING AFTER OPERATING SELECTOR LEVER FROM N TO D POSITION [FW6A-EL/FW6AXEL]) or (SLOW ENGAGING AFTER OPERATING SELECTOR LEVER FROM N TO D POSITION [EW6A-EL/EW6AXEL]) for proper diagnosis and repair procedure.
Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE
1. Verify customer concern.
2. Check if one or more of the following DTCs is stored in the TCM memory.
P0729:00

6GR incorrect ratio

P0731:00

1GR incorrect ratio

P0732:00

2GR incorrect ratio

P0733:00

3GR incorrect ratio

P0734:00

4GR incorrect ratio

P0735:00

5GR incorrect ratio

P0736:00

Gear reverse incorrect ratio

• If any of these DTCs are stored, contact the Technical Hotline for the recommended repair, then proceed to TCM
programing to verify TCM has the latest calibration file.
• If none of these DTCs are stored, proceed to step 3.

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3. Proceed to either "TCM Reprogramming" or "Oil Pressure Switch Replacement" based on the chart
below.
Proceed to TCM
Reprogramming

Proceed to Oil Pressure Switch
Replacement

2012-2013 Mazda3 SKYACTIV

2016-2019 Mazda2

2014-2015 Mazda3

2016-2018 Mazda3

2014-2015 Mazda6

2016-2017, 2021 Mazda6

2018-2020 Mazda6

2016-2017, 2021 CX-5

2013-2015 CX-5

2016-2021 CX-3

2018-2020 CX-5

2016-2019, 2021 CX-9

2020 CX-9
NOTE:
• If the concern has occurred with an older TCM file, Oil Pressure Switch replacement is
not necessary.
• If the concern has occurred with the new TCM file, proceed to Oil Pressure Switch
Replacement.
TCM Reprogramming
1. Reboot the IDS to clear memory before reprogramming.
2. Using IDS 122.06 or later software, reprogram the TCM to the latest calibration (refer to “Calibration
Information” table) by following the “Module Reprogramming” procedure.
NOTE:
• Always update the IDS tool first, then follow on-screen instructions to download the
needed calibration file for TCM reprogramming.
• It is not necessary to remove any fuses or relays during TCM reprogramming when the
IDS screen prompts you to do so. You may accidentally stop power to one of the TCM
terminals and cause the TCM to be blanked, or you may receive error messages
during the IDS reprogramming procedure.
• IDS shows the calibration part numbers after programming the TCM.
• Please be aware that TCM calibration part numbers and file names listed in any
Service Bulletin may change due to future releases of IDS software, and additional
revisions made to those calibrations for service related concerns.
• When reprogramming a TCM, IDS will always display the “latest” calibration P/N
available for that vehicle. If any calibration has been revised/updated to contain new
information for a new service concern/issue, it will also contain all previously released
calibrations.
• Start/Stop button vehicles only: DO NOT press the start/stop button during the
reprogramming process.
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• When performing this procedure, we recommend using the “Power Supply” mode in
the Battery Management System to keep the vehicle battery up to capacity. If a
different charger is used, make sure it does not exceed 20 AMPS. If it exceeds 20
AMPS, it could damage the VCM.

3. After performing the TCM reprogramming procedure, verify the repair by starting the engine and making
sure there is no Check Engine Light or abnormal warning lights present.
NOTE:
• If any DTCs should remain after performing DTC erase, diagnose the DTCs using
MGSS online.
• After TCM reprogramming, it is no longer necessary to road test the vehicle to “relearn”
KAM (Keep Alive Memory).
4. Perform “Initial Learning” according to the instructions on MGSS online (INITIAL LEARNING [FW6AEL,
FWAX-EL]).
NOTE: If the concern recurs during 10 seconds of idling with the selector lever in the P position and the
ATF temperature above 20°C {68°F}, proceed to “Oil Pressure Switch Replacement”.
5. Verify repair.
Oil Pressure Switch Replacement
NOTE:

• Proceed with Oil Pressure Switch Replacement only if the concern recurs after TCM reprogramming for applicable
vehicles.
• If the control valve body has been replaced with a new one, no further parts replacement is necessary.
1. Replace both the oil pressure switch A and B with new ones according to the instructions in MGSS (OIL
PRESSURE SWITCH REMOVAL/INSTALLATION [FW6A-EL]).
2. Verify repair.

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CALIBRATION
NOTE: TCM file name may not match to the production date range, especially if the valve body or ATX has ever been
replaced.
2012-2013 Mazda3
TCM File Name

Production Date Range

PEY0-21PS1-A

Before March 31, 2013

PE08-21PS1-N

After March 31, 2013

2014-2015 Mazda3 (US spec)
TCM File Name

Engine

i-ELOOP

VIN

PE5B-21PS1-D

PE (2.0L)

without

JM1 (Japan built)

PEDB-21PS1-B

with

PY2S-21PS1-D

PY (2.5L)

with

PEAR-21PS1-A

PE (2.0L)

without

3MZ (Mexico built)

Drive

Kickdown Switch

Production Date Range

2WD

without

Before March 31, 2013

2013 CX-5 (US spec)
TCM File Name
PEX3-21PS1 (*1)
PE02-21PS1-J

After March 31, 2013

PEX1-21PS1-A

Service part after August 1, 2
013

PEY1-21PS1-A

with

PEAS-21PS1-C
PEX3-21PS1 (*2)

Before March 31, 2013
After March 31, 2013

4WD

without

Before March 31, 2013

PE1B-21PS1-J

After March 31, 2013

PEX2-21PS1-A

Service part after August 1, 2
013

PEY2-21PS1-A
PEAT-21PS1-C

with

Before March 31, 2013
After March 31, 2013

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NOTE:
• (*1): Older version is PE02-21PS1-G.
• (*2): Older version is PE1B-21PS1-G.

2014-2015 CX-5 (US spec)
TCM File Name

Engine

Drive

Production Date Range

PEY5-21PS1-A

PE (2.0L)

2WD

Before March 31, 2013

PE1H-21PS1-D

After March 31, 2013

PEY6-21PS1-A

4WD

Before March 31, 2013

PE1K-21PS1-D
PYY0-21PS1-B

After March 31, 2013
PY (2.5L)

2WD

Before March 31, 2013

PY09-21PS1-H

After March 31, 2013

PYY1-21PS1-B

4WD

Before March 31, 2013

PY2W-21PS1-F

After March 31, 2013

2018-2019 CX-5 (US spec)
TCM File Name

Engine

Drive

SH9P-21PS1-E

2.2L Diesel

2WD

SH9T-21PS1-F

4WD

2018-2020 CX-5 (US spec)
TCM File Name

Engine

Drive

PYB1-21PS1-E
PYB2-21PS1-E
PX37-21PS1-D
PX39-21PS1-D