NHTSA ID Number: 11020640
Manufacturer Communication Number: LI20.10-P-076206
TSB/Document Date: 2025-07-10
Summary
Complaint Customer states that the CEL is lit in the instrument cluster Cause Debris in the coolant system Remedy An updated thermostat must be installed. Order the correct thermostat part number for your application: CLA45/GLA45: A 139200 66 02 All other M139 equipped vehicles: A 139 200 64 02. New screws must also be ordered and installed with the revised thermostat, PN N000000006341 (qty 2) will be used in place of the existing M8 screws. on the face of the thermostat. The new screws must be torqued to 8 Nm. Follow the instructions in WIS for removal and installation with the exception of the thermostat screw torque value mentioned previously. After replacement, fill and bleed the coolant system per the instructions in WIS for the model that is being worked on. QC the car on a test drive. If the complaint is remedied, release the vehicle.
All Vehicles Equipped with M139: CEL for P012800 - The coolant
temperature is below the coolant thermostat specified temperature.
Topic number
LI20.10-P-076206
Version
31
Function group
20.10 - Coolant pump, coolant thermostat
Date
7/7/25
Validity
All vehicles with any version of M139 engine
Reason for change
Remedy update
Complaint
Customer states that the CEL is lit in the instrument cluster
Cause
Debris in the coolant system
Remedy
An updated thermostat must be installed.
Order the correct thermostat part number for your application:
CLA45/GLA45: A 139200 66 02
All other M139 equipped vehicles: A 139 200 64 02
New screws must also be ordered and installed with the revised thermostat, PN N000000006341 (qty 2) will be used
in place of the existing M8 screws. on the face of the thermostat.
The new screws must be torqued to 8 Nm.
Follow the instructions in WIS for removal and installation with the exception of the thermostat screw torque value
mentioned previously.
After replacement, fill and bleed the coolant system per the instructions in WIS for the model that is being worked on.
QC the car on a test drive. If the complaint is remedied, release the vehicle.
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz
vehicles, using Mercedes-Benz
09.07.2025 16:44
© Copyright Mercedes-Benz AG
CCUSHWA
Page 1 / 2
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Power generation > Engine management > Indicator lamp > Engine diagnosis > lit
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC
A1392006602
Thermostat for MFA2 vehicles 1
GLA45/CLA45
X
A1392006402
Thermostat for M139L vehicles 1
All M139 vehicles except CLA45/
GLA45
X
N000000006341
screw
New screws for thermostat installation
X
2
Control unit/fault code
Control unit
Fault text
N3/10 - Motor electronics 'MRG2AMG' for combustion en- P012800 - The coolant temperature is below the coolant
gine 'M139' (ME) (MRG2AMG)
thermostat specified temperature. _
Operation numbers/damage codes
Op. no.
Operation text
09.07.2025 16:44
© Copyright Mercedes-Benz AG
Time
CCUSHWA
Damage
code
Note
Page 2 / 2
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TSB/Document ID: LI20.10-P-076206
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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