NHTSA ID Number: 11028139
Manufacturer Communication Number: MSP66 Warranty a
TSB/Document Date: 2026-02-03
Summary
Subject: Mazda
Service Program MSP66 - Engine Warning Light Illumination with DTC P0DAB 2024-2026 CX-90 and 2025-2026 CX-70, with H3T M Hybrid Boost. Mazda Motor Corporation has decided to conduct a Mazda Service Programs (MSP66) for vehicles in the U.S. and U.S. Territories. Mazda vehicles sold in Canada and Mexico are also affected by this program and must be repaired if presented to your dealership. All vehicles in this program will be in “Open” status on December 15, 2025 concurrent with the announcement of this communication. MAZDA SALES AND SERVICE TEAMS - ACTION ITEM: There are approximately 7,000 vehicles in stock at U.S. Mazda dealers which must be repaired prior to delivery. All Mazda dealers must quarantine any affected new, used or Certified Pre-Owned in-stock vehicles until the repair is completed. Once completed, the car can be delivered, and the Warranty claim can be submitted later without penalty since the car has been repaired. The affected dealer list will be provided to your District Service Manager daily beginning with receipt of this dealer email.
WARRANTY INFORMATION
MAZDA SERVICE PROGRAM MSP66
JANUARY 6, 2026:
• CLARIFIED TO ASK TECHNICIAN IF TCM HAD REPROGRAMMING
(INITIAL LEARNING) OR NOT
• ALL 2026 VEHICLES DO NOT NEED TCM REPROGRAMMING
2024-2026 CX-90 and 2025-2026 CX-70
Engine Warning Light Illumination with DTC P0DAB
CONDITION OF CONCERN
On certain subject vehicles, the engine warning light may illuminate, and the vehicle may be limited
to engine-only operation due to activation of the fail-safe mode. Motor assist, i-stop and motor
regenerative functions may be disabled, although the vehicle is safe to drive. The DTC P0DAB (Cell
voltage variation malfunction) may be stored.
Causal factor: Improper software in the Powertrain Control Module (PCM) and - MHB in MDARS
display - BECM (Battery Energy Control Module).
OUTLINE OF REPAIR
Reprogram the PCM and MHB with the Mazda Modular Diagnostic System (M-MDS), using
Mazda Diagnostic And Repair Software (MDARS).
Note: The TCM may or may not be reprogrammed, please see below for the claim type
depending on whether the TCM was programmed or not programmed. All 2026MY
vehicles do not require TCM programming. Older vehicles especially with recent software
or campaign updates will already have the TCM at the latest software version and will not
be programmed.
SUBJECT VEHICLES
Model
2024-2026 MY
CX-90 H3T
M Hybrid Boost
2025-2026 MY
CX-70 H3T
M Hybrid Boost
Subject VIN range
Subject production date range
JM3KK**** R1 100044 - 189861
JM3KK**** S1 189862 - 261073
JM3KK**** T1 350010 - 367752
From December 27, 2022 through
November 17, 2025
JM3KJ**** S1 100014 - 134448
JM3KJ**** T1 200004 - 202573
From December 5, 2023 through
November 17, 2025
- The asterisk symbol “*” can be any letter or number.
OWNER NOTIFICATION
No owner notification is required, but an explanation about the purpose (or outline) of repair and
customer’s agreement are required before starting the repair.
PARTS INFORMATION – There are no parts required for MSP66.
Page 1 of 2
WARRANTY INFORMATION
MAZDA SERVICE PROGRAM MSP66
WARRANTY CLAIM PROCESSING INFORMATION
- Ask technician if TCM was reprogrammed (requires initial learning) or not. Then submit based
on the result. MDARS sessions record TCM reprogramming and will be checked for accuracy.
- This repair will be covered under Mazda’s Powertrain Limited Warranty.
- Additional diagnostic time cannot be claimed for this repair.
- Warranty pre-authorization is required if the vehicle is outside the Mazda’s Powertrain Limited
Warranty.
2024-2025 Vehicles only - USE ONLY FOR VEHICLES WITH TCM REPROGRAMMING (INITIAL
LEARNING) - 2026MY VEHICLES ARE NOT APPLICABLE:
2024-2025MY Vehicles only
PCM and MHB reprogramming
(with TCM reprogramming and initial learning)
Process Number
Symptom Code
Damage Code
Causal Part Number & Qty
Labor Operation Code and Hours
AS033A
99
99
7777-SP-Z55 & 0
1AS33AFX & 0.8 hrs.
USE ONLY FOR VEHICLES WITHOUT TCM REPROGRAMMING (INITIAL LEARNING): INCLUDES
ALL 2026MY VEHICLES AND MANY 2024-2025 VEHICLES WITH RECENT SOFTWARE OR
OTHER CAMPAIGN COMPLETIONS
Vehicles that did not need TCM initial learning
PCM and MHB reprogramming
(without TCM initial learning)
Process Number
Symptom Code
Damage Code
Causal Part Number & Qty
Labor Operation Code and Hours
Note:
AS033A
99
99
7777-SP-Z55 & 0
1AS33BFX & 0.5 hrs.
There is no Rental car program for this MSP. Please utilize MCVP, Uber, Lyft or other
options under Mazda’s Powertrain Limited Warranty.
Page 2 of 2
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TSB/Document ID: MSP66 Warranty a
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-06
MFR Internal Campaign ID/Software Version: MSP66
Communication Type: Service Campaign
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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