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.
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
- 1 GALLON ENGINE ANTIFREEZE/COOLANT: Fully compatible with...
- PROTECTS: Advanced formulation prevents rust & corrosion...
- DESIGNED FOR NORTH AMERICAN VEHICLES: Recommended for use...
- GUARANTEED: When installed as part of a complete flush and...
- 50/50 PREDILUTED FOR QUICK TOP OFFS: Already prediluted to...
- Unsurpassed freeze protection and anti-boil performance...
- Organic acid technology resists rust, scale & corrosion...
- High-quality additives protect against leaks and won’t...
- Pre-mixed orange formula is ready-to-use in a 50/50 ratio...
- 5 year/150,000 mile guarantee protects against engine...
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
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 |
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
Page 13 of 20
01/30/2026 02:31 PM tlawrenc
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
Page 14 of 20
01/30/2026 02:31 PM tlawrenc
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.
Page 15 of 20
01/30/2026 02:31 PM tlawrenc
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.
Page 16 of 20
01/30/2026 02:31 PM tlawrenc
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
Page 17 of 20
01/30/2026 02:31 PM tlawrenc
(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:
Page 18 of 20
01/30/2026 02:31 PM tlawrenc
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.
Page 19 of 20
01/30/2026 02:31 PM tlawrenc
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.
Page 20 of 20
01/30/2026 02:31 PM tlawrenc
- CEL Doctor: The ANCEL AD310 is one of the best-selling OBD II scanners on the market and is recommended by Scotty Kilmer, a YouTuber and auto mechanic. It can easily determine the cause of the check engine light coming on. After repairing the vehicle's problems, it can quickly read and clear diagnostic trouble codes of emission system, read live data & hard memory data, view freeze frame, I/M monitor readiness and collect vehicle information.
- Sturdy and Compact: Equipped with a 2.5 foot cable made of very thick, flexible insulation. It is important to have a sturdy scanner as it can easily fall to the ground when working in a car. The AD310 OBD2 scanner is a well-constructed mechanic tool with a sleek design. It weighs 12 ounces and measures 8.9 x 6.9 x 1.4 inches. Thanks to its compact design and light weight, transporting the device is not a problem. The buttons are clearly labelled and the screen is large and displays results clearly.
- Accurate Fast and Easy to Use: The AD310 scanner can help you or your mechanic understand if your car is in good condition, provides exceptionally accurate and fast results, reads and clears engine trouble emission codes in seconds after you fixed the problem. This device will let you know immediately and fix the problem right away without any car knowledge. No need for batteries or a charger, get power directly from the OBDII Data Link Connector in your vehicle.
- OBDII Protocols and Car Compatibility: Many cheap scan tools do not really support all OBD2 protocols. AD310 scanner as it can support all OBDII protocols such as KWP2000, J1850 VPW, ISO9141, J1850 PWM and CAN. This device also has extensive vehicle compatibility with 1996 US-based, 2000 EU-based and Asian cars, light trucks, SUVs, as well as newer OBD2 and CAN vehicles both domestic and foreign. Pls confirm with our customer service whether it is compatible with your vehicle before purchasing.
- Home Necessity and Worthy to Own: This is an excellent code reader to travel or home with as it weighs less and it is compact in design. You can easily slide it in your backpack as you head to the garage, or put it on the dashboard, this will be a great fit for you. The AD310 is not only portable, but also accurate and fast in performance. Moreover, it covers various car brands and is suitable for people who just need a code reader to check their car.
- Multi-Functions - Practical Multi-Functions OBD2 code reader features built-in OBD2 DTC lookup library, which help you to determine the cause of the engine light, read code, erase code, view freeze frame, I/M ready, vehicle information, data flow, real-time curve, get vehicle speed information, calculate load value, engine coolant temperature, get engine speed.
- Wide Capability - Supports 9 protocols compatible with most 1996 US-Based, 2000 EU-Based and Asian cars, and newer OBD II & CAN domestic or import vehicles. Supports 6 languages - English,German, Dutch, Spanish, French, Italian.
- 2.8" LCD Display - Designed with a clear display 2.8" Large LCD screen - white backlight and contrast adjustment. No need any battery or charger, OBD reader gets the power directly from your vehicle through the OBDII Data Link Connector.
- Compact Design - Car diagnostic scanner is equipped with a 2.5 feet long cable and made of a very thick flexible insulator.There are 6 buttons on OBD2 Scanner:scroll up/down,enter/exit and buttons that quick query VIN vehicle number& the DTC fault code.
- ABS / Airbag codes NOT Supported - It is able to read and clear check engine information which is part of OBDII system, but it cannot work with non-OBDII systems, including ABS / Airbag / Oil Service Light, etc.
- 【Your Personal CEL Doctor – Read & Clear Engine Codes】The NT301 OBD2 scanner lets you read diagnostic trouble codes (DTCs), check em-issions readiness, turn off your Check Engine Light (CEL) or MIL, reset monitors, and view live data streams. It retrieves your vehicle's VIN instantly. Like all standard OBD2 scanners, it clears codes only after repairs are completed—if the issue persists, the code will return. Designed for DIYers who want to understand what’s really going on under the hood.
- 【Easy Code Reading – Just Plug & Play】Simply plug into the OBD2 port, turn the ignition to “ON” (engine off), and select the correct menu: Select OBDII-> Wait for seconds-> Select Read codes. For accurate results, ensure your vehicle is compatible and the OBD2 port is free from damage or wiring issues. No batteries needed— powered directly by your car.
- 【Live Data Graphing & Accuracy for Most OBD2 Vehicles】View and log live sensor data in graph form—monitor oxygen sensors, fuel trims, coolant temp, RPM, and more. Spot trends and suspicious values in real time. Compatible with most 1996+ gasoline cars, light trucks, and SUVs sold in the U.S., as well as many 2000+ European and Asian models. Also works on 12V diesel vehicles equipped with OBD2.
- 【S-mog Check Helper – Know Your Readiness Status at a Glance】With dedicated I/M readiness hotkeys and a simple Red-Yellow-Green LED indicator, you’ll instantly know if your vehicle is ready for em-issions testing. Built-in speaker provides audio feedback. No guesswork—just confidence before you head to the test center.
- 【A Must-Have Tool for Every Home Mechanic】Compact, rugged, and ready to use right out of the box. The 2.8” color screen is easy to read, even in daylight. No charging or setup required—just plug into the 16-pin DLC and start diagnosing. Recommended by professional mechanics on YouTube and trusted by DIYers worldwide.
Last update on 2026-03-24 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.