REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

UPDATED JANUARY 23, 2026 – Added video tutorial for procedure.
Modified to further highlight modules to be updated.

http://tsd.mazdausa.com/videos/MSP66%20Video%20Tutorial.mp4
The repair is a software update OR a check to make sure the software is at the current level with
an ODR update.
DO NOT STOP AT THE “SOFTWARE UPDATE SUMMARY” screen in MDARS. You must continue to
finish all steps in the entire procedure. You must have a “Software Update” entry present in
MDARS for both a MHB and PCM. If you don’t, bring the vehicle back in immediately for repair.
Modules to be updated:
1. The MHB Module
2. The PCM Module
Optional for 2024-2025 vehicles is a TCM relearn. If a TCM relearn does not appear with the PCM
update, do not perform a relearn. A TCM Relearn is NOT required for any 2026 model vehicles.
MHB module is updated (or check to make sure software is at current level) – this is only an example

PCM is updated (or check to make sure software is at current level) – this is only an example

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

Caution: MHB Battery replacement under
Mazda Warranty
If the 48V Mild Hybrid Battery (MHB) needs replaced
after MSP66 is completed. In this case, you must
update the MHB module, even if the MSP66 repair was
completed.
Click Here to go to the repair procedure

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

2024-2026 CX-90 and 2025-2026 CX-70
Engine Warning Light Illumination with DTC P0DAB
Table of Contents - Links in this document are provided for all steps below
Flowchart .................................................................................... Section A
Repair Procedure .......................................................................... Section B
Campaign Label Installation ........................................................... Section C
Vehicle Inspection Procedure and Preparation for Repair
1. Verify that the vehicle is within the following ranges and there is an OPEN MSP66
campaign in eMDCS:
SUBJECT VEHICLES
Model

Subject VIN range

2024-2026 MY JM3KK**** R1 100044 - 189861
CX-90 H3T
JM3KK**** S1 189862 - 261073
M Hybrid Boost JM3KK**** T1 350010 - 367752
2025-2026 MY
JM3KJ**** S1 100014 - 134448
CX-70 H3T
JM3KJ**** T1 200004 - 202573
M Hybrid Boost
The asterisk symbol “*” can be any letter or number.

Subject production date range
From December 27, 2022 through
November 17, 2025
From December 5, 2023 through
November 17, 2025

2. If the vehicle is in the range above and MSP66 is in OPEN status in eMDCS, proceed to
Step 2. If the vehicle does not have an OPEN MSP66 status, return the vehicle to the
customer or inventory.
3. Perform an eMDCS Warranty Vehicle Inquiry and inspect the vehicle for a Campaign
Label with MSP66 attached to the vehicle’s hood, driver door or firewall.
NOTE: Always be sure to verify the campaign number as the vehicle may have multiple
campaign labels on the hood, radiator support, and firewall or driver door jamb.

eMDCS - Warranty Vehicle Inquiry Results
If eMDCS displays:

If no repair date is displayed on the line
with CAMPAIGN MSP66, the campaign
has not been completed on this vehicle

Campaign Label is:

Action to perform:

Present

Fill out Dealer Recall Help on
OneMazda contact or the Mazda
Warranty Department at
warrantydept@mazdausa.com to
review vehicle history.

Not present

Proceed to “REPAIR PROCEDURE”.

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66
Present

Return vehicle to inventory or customer.

If repair date is displayed for CAMPAIGN
MSP66, is “CLOSED”

Not present

Complete a label and apply to vehicle’s
hood with repair date and dealer code
from eMDCS Warranty Inquiry.

CAMPAIGN MSP66 is not displayed

See Action

The vehicle is not affected by the MSP

TECHNICIAN LEVEL REQUIRED: CERTIFIED OR ABOVE (DOES NOT HAVE TO BE HYBRID
CERTIFIED). Note: Technician repairing needs to be Certified or above and does not need to be
Senior or Master as long as they have had the required training for ODR – Collection of
Diagnostic Information.
UPDATED: CAUTION PLEASE READ: If the vehicle arrives to your dealership with DTC
P0DAB, CLEAR THE CODE AND SEE IF IT RETURNS RIGHT AWAY. IF THE CODE
CLEARS PERFORM THE MSP66 REPROGRAMMING.
With the DTC P0DAB present, the code must be cleared first and confirmed no codes
in the system, then perform the software update. Perform a test drive and release the vehicle if the
code has not returned. If the code returns, please read the dealer email section “Alternate
Transportation Information” (inserted below) as the customer can continue to drive the vehicle
while the battery is on order. The warranty claim on the battery must be submitted separately
under normal warranty rather than the MSP.
Always check for an aftermarket device connected to the DLC port and remove before proceeding
with connection.
Alternative Transportation Information: Please refer to the parts and warranty information.
For vehicles experiencing MHEV battery failure associated with DTC P0DAB, dealers are
encouraged to explain to their customers to drive their vehicle while waiting for the
replacement battery to arrive. Please explain to the customer the following functions maybe
limited but does not affect the overall functionality of the vehicle, and it is still safe to drive.
• The engine warning light may illuminate
• The vehicle may be limited to engine-only operation due to fail-safe activation
o EV assist, i-stop and regeneration functions may be disabled
If the customer is uncomfortable with driving their vehicle, then please place them in a MCVP or other
form of alternative transportation.

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

Section A: Flow Chart: NOTE: This Flow Chart needs to be followed strictly and the
CAUTION from page 2 must be read before proceeding
PLEASE WATCH THIS VIDEO PRIOR TO REPAIR:
http://tsd.mazdausa.com/videos/MSP66%20Video%20Tutorial.mp4
CX-90(KK), CX-70(KJ) - VIN affected by MSP66 – READ CAUTION on Page 2
MHB related DTCs other than P0DAB must be diagnosed first prior to performing this
repair, as ANY faulty 48 Volt MHEV battery for ANY related DTC needs to be addressed
and repaired prior to MSP66. If P0DAB is present, clear DTC and check if DTC returns.
If DTC immediately returns, a 48-Volt battery is required, DO NOT perform MSP66
and read “Alternate Transportation” in the Dealer Email & page 2.
Is DTC P0DAB present?
YES

NO – PERFORM MSP66

Clear the DTC code and check if the
failure returns right away. If no DTC,
then update the software, test drive
and release the vehicle if the code
does not return. If DTC returns,
follow
steps
for
“Alternate
Transportation” in the Dealer Email
& on page 2. If DTC returns do not
perform MSP66.

Reprogram or check for current level of the following ECUs by
MDARS:
NOTE: Reprogram each ECU individually (As it doesn't reprogram
all ECUs with one click)
• PCM
• MHB in MDARS display - BECM (Battery Energy Control
Module)
NOTE: If the TCM is automatically reprogrammed when the PCM
is reprogrammed, then “Perform TCM initial learning”

2026 CX-90
And 2026 CX-70

TCM is not updated,
TCM relearn is not
required.

Check/Upload ODR data

2024-2025 CX-90
And 2025 CX-70

NOTE: Only when automatically reprogramming the TCM.
Perform TCM initial learning. Claims will be checked to verify TCM
was updated.

Perform DTC inspection

Repair completed

----------END OF SECTION A---------Page 6 of 13

REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

Section B: Repair Procedure
Reprogram ECUs by MDARS and follow all steps as required.

https://s3.us-east-1.amazonaws.com/tsd.mazdausa.com/MDARS/MDARS_ECU_
REPROGRAMMING_ PROCEDURE.pdf
1.

Check the file version of each ECU listed in the countermeasure repair procedure. Compare the
software version of each ECU with the software version in the repair procedure.
a. If the vehicle software version is newer, do not perform reprogramming.
b. If the vehicle software version is older, perform reprogramming.

Sample

PCM ( Powertrain Control Module )
Hardware part number : PYFA-18881Software part number : PYFC-188K2-

No DTCs

2.

Select target ECU to be reprogrammed.
• Required module
- PCM
- MHB
NOTE: One Package Reprogramming
MDARS automatically selects other ECUs related to the ECU to be reprogrammed. The
selected ECUs may be reprogrammed together.
Make sure that the ECU to be reprogrammed listed in the countermeasure repair
procedure is displayed in MDARS.

ECU Reprogramming

-

If the ECU related to the one-pack reprogramming is not displayed in MDARS, reprogram
the ECU that is displayed first.
Check the software version of the ECU that has not been reprogrammed and reprogram
that ECU if it is an older version.
Depending on the TCM software version, TCM reprogramming may not be necessary.

NOTE: If the target ECU is not found, return to the Quick Check screen and click the refresh
button. If the target ECU is not displayed in the Quick Check screen, start a new MDARS
session, and try again.
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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66
3.

Confirm the current and new software versions, click “Next”. CX-90 Example shown. If the
software is at the current level, do not stop repairing and continue with all remaining steps
including Uploading ODR data and Campaign Label Installation.

4.

Wait for the download and click “Next”.

5.

After completion of software update, the previous and current software version are shown.
- Check current version at ‘’Calibration File information below’’.
- Then, click on “Finish” to exit the ECU reprogramming.

CX-90 Example

Calibration file information
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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

Note: If the calibration file is with the suffix in the table or later, unit is already modified. TCM
Relearn is not required for 2026MY vehicles
Calibration file information
Model

Module
MHB

CX-90
PCM

MHB
CX-70
PCM

Target ECU
(Hardware #)
K628-67ZBZK629-67ZBZH301-18881H301-18881H301-18881H301-18881K628-67ZBZK629-67ZBZH301-18881H301-18881H301-18881H301-18881-

Target
Software file #

Reprogramming
Time (min.)

K628-67ZH2-J

3

H333-188K2-D
H334-188K2-D
H301-188K2-V
H302-188K2-V

3 (Without TCM) or
8 (With TCM)

K628-67ZH2-J

3

H335-188K2-C
H336-188K2-C
H327-188K2-K
H328-188K2-K

3

3
3 (Without TCM) or
8 (With TCM)

(Repair procedure is continued on next page)

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66
6.

Check to make sure MHB and PCM modules were updated OR at the
current level. There must be a “Software Update” entry in MDARS for
each module.

If you do not have an entry for MHB and PCM, go back to step 1 of the repair.
MHB module is updated (or check to make sure software is at current level) – this is only an example

PCM is updated (or check to make sure software is at current level) – this is only an example

Upload ODR Data - Go to Mandatory Post-Reprogramming Section Step 7 and
later.
7.

Disconnect battery charger before going to next step.

TCM Initial Learning after TCM reprogramming (if TCM does not appear in
MDARS it does not need updated and re-learn not required but continue with
all repair steps. TCM Relearn is not required for 2026MY vehicles)
TCM Initial learning
CAUTION: If the VIN is affected by other campaigns besides MSP66 which also require ‘TCM Initial
Learning after TCM reprogramming’, please only perform this MSP once all other campaigns have been
completed (ECU software reprogramming for other campaigns has been completed).

DTC inspection – Go to Mandatory Post-Reprogramming Section in link
Note: On the test vehicle Hybrid System Malfunction appeared on screen
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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

without DTC. Cycled key and message disappeared
1. Check and erase DTC by using MDARS.
2. Confirm all DTCs were erased.
NOTE:
If any DTCs should remain after performing DTC erase, diagnose the DTCs according to the
appropriate troubleshooting section of the Workshop Manual.
3.

Disconnect the MDARS from the DLC-2.

Explanation to customers as provided in the repair link
----------END OF SECTION B, PROCEED TO SECTION C.----------

C. Check for CV Notification Message in Vehicle (the message states Special
Service Program, but that is used in this case for MSP66).
NOTE: Not all customers will have this notice. If the message is not in the vehicle, please proceed
to Section D. – Campaign Label Installation.
Step 1: Verify the message is in the View Status Monitor in Mazda Connect Inbox. Once at the
main screen, select “View” then you will see photo 2.
Photo 1

Photo 2

Step 2: After repair has completed, go to eMDCS Warranty Vehicle Inquiry.
Recalls/Campaign Section

Go to the

Step 3: Click the “Request” button under TURN OFF CV NOTIFY

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

Step 4: Click “CONFIRM” (Example below of a test vehicle) – NOTE: TURNING OFF DOES NOT
CLOSE THE CAMPAIGN, YOU MUST STILL SUBMIT A WARRANTY CLAIM.
(last digits of VIN are masked here. The full VIN will appear in eMDCS)

Step 5: Make sure TURN OFF NOTIFY has today’s date.
IMPORTANT – Once you see a date you selected Request OFF as below in the red square, exit
eMDCS and let the customer know the CV message (Photo 1) will go away within 24 hours.
If the customer returns and the CV message does not turn off after Technician and Warranty
Claim submission:
A. Please have the technician verify steps 1 – 3 that the CV message still appears
B. If verified enrolled in CV, then contact technical hotline for next steps to remove the message.

----------END OF SECTION C, PROCEED TO SECTION D.----------

D. Campaign Label Installation
1. Fill out a Black “Campaign Label” (9999-95-055A-06) with Campaign #: “MSP66”,
your dealer code, and the repair date. It is OK to bundle multiple campaigns on
one label as long as each campaign is legible as Mazda vehicles may have more
than 1 campaign. Use more than one label if necessary.

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REPAIR PROCEDURE
MAZDA SERVICE PROGRAM MSP66

2. Affix it to the hood as shown. If you cannot place the label here, the radiator
support, firewall or driver door jamb are acceptable locations:

END OF REPAIR PROCEDURE

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