01-005-23a

BULLETIN NOTES
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted below in Red.
Previously Issued TSBs:
01-005/23
01-013/22
01-011/21
Date(s) Issued
02/16/23
10/19/22
09/27/21 and 04/22/21
APPLICABLE MODEL(S)/VINS
2019-2023 Mazda3 (Japan built) with VINs lower than JM1BP******623951 (produced before May 23, 2023)
2019-2023 Mazda3 (Mexico built) with VINs lower than 3MZBP******385892 (produced before Sep. 11, 2023)
2021 Mazda3 (M/T) with VINs between JM1BP******400001 and 400820 (produced on July 2, 2021)
2018-2021 Mazda6 with VINs lower than JM1GL******620105 (produced before Nov. 12, 2021)
2019-2020 Mazda6 (Mexico spec) with VINs lower than JM1GL******524069 (produced before March 27, 2020)
2019-2022 CX-3 with VINs lower than JM1DK******606638 (produced before July 11, 2022)
2018-2020 CX-5 (US/Mexico spec.) with VINs lower than JM3KF******869654 (produced before Aug. 24, 2020)
2021 CX-5 (Canada/Mexico spec.) with VINs lower than JM3KF******133782 (produced before June 18, 2021)
2021-2024 CX-5
2020-2023 CX-30 with VINs lower than 3MVDM******589428 (produced before Sep. 26, 2023)
NOTE: Vehicles with SKYACTIV-G 2.5T (turbo) are not applicable.
DESCRIPTION
Some customers may experience the check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or
more of the following symptoms:
•
•
•
•
The engine takes longer to warm up
The engine temperature gauge fluctuates
The low coolant temperature indicator (blue) light stays on longer or comes on while driving
Poor heater performance, especially at idle
NOTE:
• Vehicles with SKYACTIV-G 2.5T are not applicable.
• If DTC P2B61:00 (Coolant control valve circuit range/performance) accompanies DTC P0126:00, this TSB is not
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applicable. Diagnose according to the instructions on MGSS online.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concerns and check the coolant temperature in the freeze frame data.
• If it is at around 104-176 °F (40-80 °C), proceed to step 2.
• If it is not at around 104-176 °F (40-80 °C), this TSB is not applicable. Diagnose according to the instruction on
MGSS.
2. Replace the coolant control valve with a new one according to the instruction on MGSS (COOLANT CONTROL
VALVE REMOVAL/INSTALLATION).
•
•
•
•
•
Mazda3 (COOLANT CONTROL VALVE REMOVAL/INSTALLATION)
Mazda6 (COOLANT CONTROL VALVE REMOVAL/INSTALLATION)
CX-3 (COOLANT CONTROL VALVE REMOVAL/INSTALLATION)
CX-5 (COOLANT CONTROL VALVE REMOVAL/INSTALLATION)
CX-30 (COOLANT CONTROL VALVE REMOVAL/INSTALLATION)
3. Warm up the engine and confirm that the primary malfunction is resolved according to the instruction on MGSS
(Repeatability verification procedure in the DTC P0126:00 [PCM]).
•
•
•
•
•
Mazda3 (DTC P0126:00 [PCM (SKYACTIV-G)])
Mazda6 (DTC P0126:00 [PCM (SKYACTIV-G)])
CX-3 (DTC P0126:00 [PCM (SKYACTIV-G)])
CX-5 (DTC P0126:00 [PCM (SKYACTIV-G)])
CX-30 (DTC P0126:00 [PCM (SKYACTIV-G)])
4. Verify repair.
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PARTS INFORMATION
Parts Number
Description
Qty.
Notes
PYFD-15-16ZA
Valve, Water Control
1
For A/T, O-ring included
PYFA-15-16ZB
Valve, Water Control
1
For M/T, O-ring included
PYFB-15-169
Gasket, Water Outlet
1
[R] for Lower radiator hose component
PE13-15-296
Connector
1
[R] for water hose for A/T oil cooler
PYFA-15-592A
O-Ring (Water Outlet)
1
[R] for ECT sensor No.2
PYFB-15-113
Washer
1
[R] for ECT sensor No.2
0000-77-508E-20
Coolant
as needed
7.8 US qt (7.4L, 6.5 Imp qt) maximum
[R]: Replacement parts
Replacement Part Locations
• O-ring
• Gasket
• Connector
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• O-ring and washer for ECT sensor No.2
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WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
• This repair will be covered under Mazda’s Powertrain Warranty term, Calif. Emission Warranty (long term) [except
2018 Mazda6, 2019 CX-3 and 2018 CX-5], or Calif. Emission Warranty (short term) [2018 Mazda6, 2019 CX-3
and 2018 CX-5]
• Additional diagnostic time cannot be claimed for this repair.
Warranty Type
A
Symptom Code
6X
Damage Code
9K
Part Number Main Cause
PYFD-15-16Z or PYFA-15-16ZB
Quantity
1
Operation Number / Labor Hours:
Model
Mazda3
CX-3
CX-30
Mazda6
CX-5
See chart below
Spec
Operation No.
Labor Hours
2.0L
XXT2BARX
2.5L (A/T)
XXT2BBRX
2.5L (M/T)
XXT2BCRX
1.2 Hrs.
2.0L
XXT2BARX
1.2 Hrs.
2.0L
XXT2BARX
2.5L without cylinder deactiv
ation
XXT2BDRX
2.5L with cylinder deactivati
on
XXT2BERX
1.3 Hrs.
2.5L
XXT2BFRX
1.3 Hrs.
2.0L (M/T)
XXT2BGRX
1.2 Hrs.
2.0L (A/T)
XXT2BHRX
2.5L
XXT2BFRX
1.3 Hrs.
1.2 Hrs.
1.3 Hrs.
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