NHTSA ID Number: 11030699
Manufacturer Communication Number: DRW59 Warranty
TSB/Document Date: 2026-04-04
Summary
Subject: Notification of Dealer Re-Work (DRW59) – 2026MY CX-30 and 2026MY Mazda3 - Check Engine Light On With DTC P0126:00 Dear Mazda
Dealer Colleagues, Mazda Motor Corporation has decided to conduct a Dealer Re-Work on certain 2026MY CX-30 and Mazda3 vehicles. Concern Outline: On certain subject vehicles, the check engine light may illuminate with DTC P0126:00 (Thermostat stuck open) stored due to improper PCM control logic. Repair Outline: Reprogram the PCM with the Mazda Modular Diagnostic System (M-MDS), using Mazda Diagnostic and Repair Software (MDARS) by following TSB 01-006/26 repair instructions. ACTION ITEM - STOP DELIVERY: All affected vehicles in inventory can be sold but not delivered until repaired. There are approximately 17,942 new vehicles in dealer stock and/or in transit to dealers. All affected dealer inventory types with this DRW must be repaired prior to delivery. The number of affected units at your dealership can be seen in Inventory & Sales 2.0 in eMDCS and a VIN list (via an internal MNAO campaign reporting) will also be provided to your District Service Manager by 5pm (Pacific Time) on the date this dealer email is sent. Owner Notification: There is no Owner Notification with this or any Dealer Re-Work. PARTS INFORMATION: There are no parts required for this repair.
DEALER RE-WORK DRW59
WARRANTY INFORMATION
Dealer Re-Work (DRW59) – 2026MY CX-30 and 2026MY Mazda3 - Check Engine Light On With
DTC P0126:00
CONDITION OF CONCERN
On certain subject vehicles, the check engine light may illuminate with DTC P0126:00 (Thermostat
stuck open) stored due to improper PCM control logic.
OUTLINE OF REPAIR:
Reprogram the PCM with the Mazda Modular Diagnostic System (M-MDS), using Mazda Diagnostic
and Repair Software (MDARS) by following TSB 01-006/26 repair instructions.
SUBJECT VEHICLES
Model
Subject VIN range
Subject production date range
2026 CX-30
(MMVO production)
3MVDM**** TM 100015 – 141099
From August 5, 2025 through
February 26, 2026
2026 Mazda3
From July 2, 2025 through
JM1BP**** T1 850019 – 878007
(MC production)
February 25, 2026
The asterisk symbol “*” can be any letter or number. Only VINs in this range and with “Open” status in
eMDCS are subject to this DRW.
PARTS INFORMATION: There are no parts required for this repair.
Page 1 of 3
DEALER RE-WORK DRW59
WARRANTY INFORMATION
WARRANTY CLAIM PROCESSING INFORMATION
IMPORTANT NOTE:
1) Software update entry is required in MDARS for the PCM if reprogrammed (this is checked
in the last step of the repair procedure) or if software is at the current version. Also, all
vehicles are required to perform an ODR, “Collect Diagnostic Information” after the PCM is
reprogrammed OR checked for current version. If the ODR is not uploaded successfully, or if
one or more software updates are missed or done incorrectly, the warranty claim will be
rejected and DRW59 will remain open with the claim unpaid. The Mazda Dealer will then
be required to bring the vehicle back to correct the concern.
2) Please wait up to 30 minutes after completing the DRW59 operation before submitting the
warranty claim
PCM Reprogramming by M-MDS
(MDARS)
Process Number
Symptom Code
Damage Code
Causal Part Number
Quantity
Labor Operation Number
Labor Hours
AT014A
99
99
7777-SP-A08
0
1AT14XFX
0.3 hrs.
Page 2 of 3
DEALER RE-WORK DRW59
WARRANTY INFORMATION
RENTAL CAR INFORMATION
Rental expenses exceeding the two-day limit or over the per day limit set by Mazda Warranty
policy will require prior Warranty Department Authorization prior to giving the rental to the
customer regardless of the reason. Please refer to the Mazda Rental Car Reimbursement
Program policy in the Mazda Warranty Policies and Procedures Manual. Mazda recommends
the usage of the MCVP loaner vehicle when available. If all MCVP loaner vehicles are in use and
unavailable, and the customer needs a rental car, then use your local rental facility and offer a
rental car. Be sure that every effort is made to repair the car within one business day or less, so the
next customer can receive the same experience.
Rental Car Warranty Claim Information
MCVP Vehicle Preferred
Warranty Type Code
Symptom Code
Damage Code
Part Number Main Cause
Part Quantity
Labor Operation Code
Labor Hours
Sublet – Rental Car
Sublet Invoice
Number
Sublet Type Code
Sublet Amount
Sublet Text
N/A
MCVP does not require
claim submission
Alternative Transportation
(Rental, Uber, Lyft, Taxi)
A
99
99
5555-SS-PE0R
0
MM024XRX
0
Number from Rental Invoice or
Dealer Purchase Order
Enter “Z9” (other)
Up to the maximum allowed
per current warranty policy
Number of days the rental car
was supplied to the customer
Page 3 of 3
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TSB/Document ID: DRW59 Warranty
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-25
MFR Internal Campaign ID/Software Version: DRW59
Communication Type: Service Campaign
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem: Cooling System
Previous TSB | Next TSB |
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