NHTSA ID Number: 11028092
Manufacturer Communication Number: 01-001-26a
TSB/Document Date: 2026-02-03
Summary
Some customers may experience a check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: Engine takes longer to warm up. • Engine temperature gauge fluctuates. • Low coolant temperature indicator (blue) light stays on longer or turns on while driving. • Poor heater performance, especially at idle. • This concern may be caused if the coolant control valve fail-safe thermostat opens at a temperature lower than the normal temperature due to a deformation of the thermostat diaphragm. To eliminate the concern, the water flow control valve specification has been modified.
PAHM-188K2-B
PAHN-188K2-A
PAHN-188K2-B
PAHP-188K2-B
PAHP-188K2-C
PAHR-188K2-C
PAHR-188K2-D
PAHS-188K2-C
PAHS-188K2-D
PAHT-188K2-D
PAHT-188K2-E
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CX-5
File Name (OLD)
File Name (NEW)
PYFA-188K2-L
PYFA-188K2-M
PYFB-188K2-L
PYFB-188K2-M
PYFC-188K2-L
PYFC-188K2-M
PYFD-188K2-L
PYFD-188K2-M
PYH9-188K2-H
PYH9-188K2-J
PYJ2-188K2-H
PYJ2-188K2-J
PEL1-188K2-G
PEL1-188K2-H
PYJ1-188K2-G
PYJ1-188K2-H
PYJ3-188K2-G
PYJ3-188K2-H
PEL2-188K2-F
PEL2-188K2-G
PX42-188K2-E
PX42-188K2-F
PX44-188K2-F
PX44-188K2-G
PX46-188K2-E
PX46-188K2-F
PX48-188K2-E
PX48-188K2-F
PAL9-188K2-E
PAL9-188K2-F
PX43-188K2-E
PX43-188K2-F
PX45-188K2-F
PX45-188K2-G
PX47-188K2-D
PX47-188K2-E
PX49-188K2-D
PX49-188K2-E
PAM1-188K2-D
PAM1-188K2-E
PX2E-188K2-F
PX2E-188K2-G
PX2G-188K2-J
PX2G-188K2-K
PX2A-188K2-C
PX2A-188K2-D
PX2C-188K2-H
PX2C-188K2-J
PW8F-188K2-
PW8F-188K2-A
PAEK-188K2-B
PAEK-188K2-C
PX2F-188K2-F
PX2F-188K2-G
PX2H-188K2-J
PX2H-188K2-K
PX2B-188K2-C
PX2B-188K2-D
PX2D-188K2-H
PX2D-188K2-J
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PW8G-188K2-
PW8G-188K2-A
PAEL-188K2-B
PAEL-188K2-C
CX-30
File Name (OLD)
File Name (NEW)
PA6V-188K2-G
PF9A-188K2-
PA6X-188K2-H
PF9C-188K2-
PXH8-188K2-J
PWDF-188K2-
PA6T-188K2-G
PF8X-188K2-
PA6W-188K2-H
PF9B-188K2-
PXH7-188K2-J
PWDE-188K2-
PXL5-188K2-H
PWDD-188K2-
PXL4-188K2-H
PWDB-188K2-
PXK1-188K2-J
PWDH-188K2-
PA7H-188K2-H
PF9E-188K2-
PXM2-188K2-H
PWDC-188K2-
PXM1-188K2-H
PWDA-188K2-
PXJ9-188K2-J
PWDG-188K2-
PA7G-188K2-H
PF9D-188K2-
PG3A-188K2-C
PF9H-188K2-
PG2W-188K2-C
PF9F-188K2-
PXKH-188K2-C
PWDL-188K2-
PXKF-188K2-C
PWDJ-188K2-
PG3B-188K2-C
PF9J-188K2-
PG2X-188K2-C
PF9G-188K2-
PXKJ-188K2-C
PWDM-188K2-
PXKG-188K2-C
PWDK-188K2-
NOTE: This Service Information is only applicable for vehicles using the above calibration files.
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PARTS INFORMATION
Parts Number
Description
Qty.
Notes
PYY3-15-SA1
DUMMY PLUG FOR CCV
1
Set includes the plug
USE KIT PYY2-15-SAY KIT OR PE13-15-296 & PYFB-15-169 INDIVIDUALLY
[R] for water hose for A/T oil cooler &
1
PYY2-15-SAY
KIT
[R] for Lower radiator hose component
PE13-15-296
CONNECTOR
1
[R] for water hose for A/T oil cooler
GASKET, WATER
PYFB-15-169
1
[R] for Lower radiator hose component
OUTLET
0000-77-508F-20
COOLANT
2
7.4 L {7.8 US qt, 6.5 Imp qt} maximum
[R]: Replacement parts
NOTE:
• The individual parts (PE13-15-296 & PYFB-15-169) will be phased out and replaced by part PYY2-15-SAY.
• Once dealers are out of stock of the individual parts, only PYY2-15-SAY will be accepted.
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WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
• Additional diagnostic time cannot be claimed for this repair.
• This repair will be covered under Mazda’s Powertrain Warranty:
Calif. Emission Warranty:
U.S.A. except 2018 MAZDA6, 2019/2020/2022 CX-3 and 2018 CX-5:
Calif. Emission Warranty (long term)
U.S.A. 2018 MAZDA6, 2019/2020 CX-3 and 2018 CX-5:
Calif. Emission Warranty (short term)
MDARS-Programmed Vehicles — Click to Expand Claim Processing Information
(With related parts ordered as a kit)
Process Number
Warranty Type Code
Symptom Code
Damage Code
Part No. Main Cause
Quantity
Related Part No. & Qua
ntity
Operation No. and Labor
Hours
Period Covered
TR050A
A
6X
9K
PYY3-15-SA1
1
PYY2-15-SAY & 1
0000-77-508F20 & 2 (Max. 7.4L coolant)
Refer to the Operation No. and Labor Hours table below
Important:
The repair cost should be claimed / covered as below.
Repair on the vehicle within Powertrain Warranty period:
Please submit a normal warranty claim to using the process number
TR050A.
Repair on the vehicle beyond Powertrain Warranty period but up to 15 years/150,00
0 miles (240,000 km), please refer to SSPD8 Warranty Claim processing information
.
OR
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(With related parts ordered individually)
Process Number
Warranty Type Code
Symptom Code
Damage Code
Part No. Main Cause
Quantity
TR050A
A
6X
9K
PYY3-15-SA1
1
* PYFB-15-169 & 1
* PE13-15-296 & 1 (for AT only)
0000-77-508F20 & 2 (Max. 7.4L coolant)
Related Part No. & Qua
ntity
Operation No. and Labor
Hours
Period Covered
Refer to the Operation No. and Labor Hours table below
Important:
The repair cost should be claimed / covered as below.
Repair on the vehicle within Powertrain Warranty period:
Please submit a normal warranty claim to using the process number
TR050A.
Repair on the vehicle beyond Powertrain Warranty period but up to 15 years/150,00
0 miles (240,000 km), please refer to SSPD8 Warranty Claim processing information
.
* Until parts run out.
IDS-Programmed Vehicles — Click to Expand Claim Processing Information
(With related parts ordered as a kit)
Process Number
Warranty Type Code
Symptom Code
Damage Code
Part No. Main Cause
Quantity
Related Part No. & Qua
ntity
Operation No. and Labor
Hours
TR050B
A
6X
9K
PYY3-15-SA1
1
PYY2-15-SAY & 1
0000-77-508F20 & 2 (Max. 7.4L coolant)
Refer to the Operation No. and Labor Hours table below
D20 Attachment
Print out from IDS showing PCM new version or version at current level required by re
pair.
Period Covered
Important:
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The repair cost should be claimed / covered as below.
Repair on the vehicle within Powertrain Warranty period:
Please submit a normal warranty claim to using the process number
TR050A.
Repair on the vehicle beyond Powertrain Warranty period but up to 15 years/150,00
0 miles (240,000 km), please refer to SSPD8 Warranty Claim processing information
.
OR
(With related parts ordered individually)
Process Number
Warranty Type Code
Symptom Code
Damage Code
Part No. Main Cause
Quantity
Related Part No. & Qua
ntity
Operation No. and Labor
Hours
D20 Attachment
Period Covered
TR050B
A
6X
9K
PYY3-15-SA1
1
* PYFB-15-169 & 1
* PE13-15-296 & 1 (for AT only)
0000-77-508F20 & 2 (Max. 7.4L coolant)
Refer to the Operation No. and Labor Hours table below
Print out from IDS showing PCM new version or version at current level required by re
pair.
Important:
The repair cost should be claimed / covered as below.
Repair on the vehicle within Powertrain Warranty period:
Please submit a normal warranty claim to using the process number
TR050A.
Repair on the vehicle beyond Powertrain Warranty period but up to 15 years/150,00
0 miles (240,000 km), please refer to SSPD8 Warranty Claim processing information
.
* Until parts run out.
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Operation No. and Labor Hours
Model
Mazda3
CX-30
CX-3
CX-5
Mazda6
Engine
PE / PY
PE / PY
PE
PE
PY
PE / PY
Variation
------M/T
A/T
A/T
---
Operation No
XXX43ARX
XXX43ARX
XXX43ARX
XXX43ARX
Labor Hours (hrs.)
1.6
1.6
1.6
1.6
XXX43BRX
1.7
XXX43BRX
1.7
NOTE:
• If the subject vehicle comes back again with DTC P0126:00, contact the Technical Hotline.
• For repairs of out of warranty period, refer to SSPD8 (except for Mexico).
Warranty Claim Notes:
• After CCV replacement and PCM reprogramming, successful confirmation of the software must be submitted in
order to pay the Warranty Claim.
• For vehicles updated with IDS (2018–2020 CX-5, Mazda6), download and print the log viewer session that shows
the updated PCM software file and VIN and attach the data by selecting Attachment ID#20 (Printout from
Diagnostic Tool) when submitting a warranty claim. Failure to submit the data will result in claim rejection, denial,
or debit.
• All vehicles updated with MDARS require the upload of ODR (Manual) after the technician has completed all
software updates. MDARS claims will not require data attachment as it is done electronically.
• If ODR is not uploaded successfully, or if software updates are missed, the warranty claim will not be accepted
and the customer may have to return for corrections. The ODR Update (Manual) must be performed even if the
module software is up to date.
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- 1 GALLON ENGINE ANTIFREEZE/COOLANT: Fully compatible with...
- PROTECTS: Advanced formulation prevents rust & corrosion...
- DESIGNED FOR ASIAN VEHICLES: Recommended for use with Acura...
- GUARANTEED: When installed as part of a complete flush and...
- 50/50 PREDILUTED FOR QUICK TOP OFFS: Already diluted to make...
- 5 year/150, 000 mile . Silicate-free, long-life, phosphate...
- Formulated to replace the OEM fluid in Asian make vehicles...
- The long life formula provides protection for all cooling...
- Meets the following OEM and industry specifications...
- Contains 30 – 50 ppm of denatonium benzoate as a bittering...
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TSB/Document ID: 01-001-26a
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-31
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem: Cooling System
Previous TSB | Next TSB |
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