Technical
Service Bulletin

Mazda North American Operations
Irvine, CA 92618-2922

Subject:
CHECK ENGINE LIGHT ON WITH DTC P0012:00

Bulletin No.: 01-014/19

Last Issued: 08/01/2019

APPLICABLE MODEL(S)/VINS
2018 Mazda6 vehicles (equipped with coolant control valve) with VINs lower than JM1GL******336737
(produced before Dec. 21, 2018)
2018 CX-5 vehicles (equipped with coolant control valve) with VINs lower than JM3KF******476255
(produced before Sep. 29, 2018)
NOTE: Vehicles equipped with SKYACTIV-G 2.5T are not applicable to this service bulletin.

DESCRIPTION
Some customers may experience a check engine light illuminating with DTC P0012:00 stored in PCM
memory.



DTC P0012:00 - Electric variable valve timing control system: Over-retarded

NOTE: This concern occurs only on vehicles with PCMs manufactured by MITSUBISHI.
PCM Identification

Due to improper control logic of the PCM, a false error may be detected. To eliminate this concern, the
PCM software has been modified.

Page 1 of 6
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2019 Mazda North American Operations, U.S.A.

Bulletin No.: 01-014/19

Last Issued: 08/01/2019

Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE
1. Verify the customer concern.
2. Using the image above, verify the PCM in the subject vehicle is manufactured by MITSUBISHI, if yes,
proceed to next step.
3. Replace the electric variable valve timing actuator (1) according to the instructions on MGSS online:




CX-5 - ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE
TIMING ACTUATOR REMOVAL/INSTALLATION
Mazda6 - ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE
TIMING ACTUATOR REMOVAL/INSTALLATION

4. After electric variable valve timing actuator replacement, you must read all cautions and notes below
before proceeding to "PCM REPROGRAMMING".
ATTENTION: READ ALL CAUTIONS AND NOTES BEFORE AND AFTER REPROGRAMMING PCM!
CAUTIONS:
•IF IDS DOES NOT HAVE SUFFICIENT BATTERY POWER, THE REPROGRAMMING WILL FAIL.
•PCM DAMAGE MAY OCCUR IF THE CORRECT BATTERY CHARGER SETTING IS NOT USED.
•SET THE BATTERY MANAGEMENT SYSTEM TO "POWER SUPPLY MODE" DURING PCM
REPROGRAMMING.
• POWER SUPPLY MODEwill maintain proper battery voltages during PCM reprogramming.
• If a different charger is used, MAKE SURE IT DOES NOT EXCEED 20 AMPS.IF IT EXCEEDS 20 AMPS,

Page 2 of 6
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2019 Mazda North American Operations, U.S.A.

Bulletin No.: 01-014/19

Last Issued: 08/01/2019

IT COULD DAMAGE THE PCM.
• The charger MUSTbe connected directly to the vehicle battery.
• It is NOTnecessary to remove any fuses or relays during PCM reprogramming when the IDS screen
prompts you to do so. You may accidentally stop power to one of the PCM terminals and CAUSE THE PCM
TO BE BLANKED, or you may receive error messages during the IDS reprogramming procedure.
• Start/Stop button vehicles: DO NOTpress the start/stop button during the reprogramming process.
BEFORE REPROGRAMMING PCM:
NOTE:
• Verify the current PCM file name in the vehicle by log view screen. If it's the same as shown in the
chart(s) below (or a later one), you do not need to reprogram the PCM.
• Always update the IDS tool first, then follow on-screen instructions to download the needed calibration file
for PCM reprogramming.
• If the vehicle exhibits any trouble codes or driveability symptoms, diagnose and repair using MGSS
BEFOREattempting to reprogram the PCM.
• When reprogramming a PCM, 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, it will also
contain all previously released calibrations.
• Confirm the DLC cable is in good condition before attempting to reprogram the PCM.
PCM REPROGRAMMING:
1. Reboot the IDS to clear memory before reprogramming.
2. Using the latest IDS Software available, reprogram the PCM to the latest calibration (refer to “Calibration
Information” table) by following the “Module Reprogramming” procedure.
3. Verify the file name matches with the Calibration chart(s) below.
4. Clear all DTCs.
5. Start the engine and confirm that no warning lights stay on.
6. Record the customers radio presets from the infotainment system.
7. Disconnect the negative battery cable and wait at least 30 seconds to reset the fuel control learning data.
8. Re-connect the negative battery cable.
9. Re-enter the customers presets into the infotainment system.
AFTER REPROGRAMMING PCM:
NOTE:
• IDS shows the calibration part numbers after programming the PCM.
• If any DTCs should remain after performing DTC erase, diagnose the DTCs using MGSS online
instructions and submit a warranty claim according to the normal warranty procedure.
• Be aware that PCM 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.

CALIBRATION INFORMATION
Mazda6

Page 3 of 6
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2019 Mazda North American Operations, U.S.A.

Bulletin No.: 01-014/19

MY Engine

Transmission
MT

2018

2.5L

Last Issued: 08/01/2019

AT

File Name

Note

PYH1-188K2-H w/o cylinder deactivation
PYH2-188K2-H w/o cylinder deactivation
PYH3-188K2-J with cylinder deactivation

CX-5

MY Engine
2.0L
2018

TransDrive
mission
MT

Note

2WD PEL1-188K2-D
2WD

2.5L

File Name

AT
4WD

---

PYH9-188K2-E w/o cylinder deactivation
PYFA-188K2-H with cylinder deactivation
PYJ2-188K2-E w/o cylinder deactivation
PYFC-188K2-H with cylinder deactivation

PARTS INFORMATION
Part Number

Description

Qty.

Notes

PE02-12-4X0 ACTR,VARIABLE V.TIMING

1

---

PE01-12-257

RING, O

1

[R] For electric variable valve timing motor/driver

9YA0-20-678

BOLT

1

[R] Upper blind plug at timing chain cover

9YA0-20-863

BOLT

1

[R] Lower blind plug at timing chain cover, 2.0L

9YA0-20-865

BOLT

1

[R] Lower blind plug at timing chain cover, 2.5L

PE01-10-235

GASKET, HEAD COVER

1

[R] For 2.0L

PY01-10-235

GASKET, HEAD COVER

1

[R] For 2.5L (w/o cylinder deactivation)

PYFA-10-235

GASKET, HEAD COVER

1

[R] For 2.5L (with cylinder deactivation)

NOTE:



Use VIN to confirm correct part number(s) in the GEPC.

Page 4 of 6
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2019 Mazda North American Operations, U.S.A.

Bulletin No.: 01-014/19



Last Issued: 08/01/2019

It is not necessary to order a PCM part for this repair procedure.

Location of the replacement parts [R]

RING, O

BOLT

GASKET, HEAD COVER

WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty
repair.
• This repair will be covered under Fed. Emission Warranty (long term).

Page 5 of 6
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2019 Mazda North American Operations, U.S.A.

Bulletin No.: 01-014/19

Last Issued: 08/01/2019

• Additional diagnostic time cannot be claimed for this repair.

Symptom Code

6X

Damage Code

9W

Part Number Main Cause

5555-RP-PCM

Part Quantity

0

Labor Operation No. / Labor Hours (Refer to table shown below)

NOTE: Enter ACTR,VARIABLE V. TIMING (PE02-12-4X0, qty = 1) and replacement parts as related parts.

Model

Spec.

Operation No. Labor Hours

Mazda6

2.5L

XXR89DFX

2.1 Hrs.

CX-5

2.0L
2.5L w/o cylinder deactivation

XXR89FFX

2.0 Hrs.

2.5L with cylinder deactivation

XXR89GFX

2.1 Hrs.

NOTE: Vehicles equipped with SKYACTIV-G 2.5T are not applicable to this service bulletin.

Page 6 of 6
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2019 Mazda North American Operations, U.S.A.