NHTSA ID Number: 11012807
Manufacturer Communication Number: LI20.10-P-076206
TSB/Document Date: 2025-01-10
Summary
Complaint Customer states that the CEL is lit in the instrument cluster Cause Debris in the coolant system Remedy Please refer to the specific repair instructions for the vehicle you are working on in the attachments section of this LI. Before beginning work on the vehicle open a TIPS case and request the tool you will need. In your request include a contact name, phone number, and shipping address for the tool to be sent. Before the tool arrives: • Remove and replace the coolant expansion tank (reservoir) and the main radiator. • Without removing the components: flush the heater core and changeover valve (located in the right front wheel arch) in the opposite direction of flow until no debris remains. Once the tool arrives, proceed with flushing the vehicle per the instructions attached in this LI. A picture of the filter after each flush must be taken. If after the prescribed number of flushing attempts debris is still being collected in the filter, upload all the pictures to the TIPS case and wait for next steps. A scale of not-acceptable to acceptable debris level in the filter is in the attachments for you to make an assessment as well.
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
21
Function group
20.10 - Coolant pump, coolant thermostat
Date
1/9/25
Validity
All vehicles with any version of M139 engine
Reason for change
Rework instructions update for C43 and SL43
Complaint
Customer states that the CEL is lit in the instrument cluster
Cause
Debris in the coolant system
Attachments
File
Description
Debris Aft of Sealing Surface of Thermostat.png
Result of Using Light Source to Detect Debris.png
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© Copyright Mercedes-Benz
AG
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Page 1 / 7
Debris at Interior Sealing Surface of Thermostat.png
Using Light Source to Detect Debris.png
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© Copyright Mercedes-Benz AG
CCUSHWA
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Debris near Mating Surface of Thermostat.png
Heavy Debris in Thermostat.png
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© Copyright Mercedes-Benz AG
CCUSHWA
Page 3 / 7
CLA_GLA M139 Coolant Diagram.png
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© Copyright Mercedes-Benz AG
CCUSHWA
Page 4 / 7
Filter Go_No Go.PNG
Remedy
Please refer to the specific repair instructions for the vehicle you are working on in the attachments section of this LI.
Before beginning work on the vehicle open a TIPS case and request the tool you will need.
In your request include a contact name, phone number, and shipping address for the tool to be sent.
Before the tool arrives:
•
•
Remove and replace the coolant expansion tank (reservoir) and the main radiator.
Without removing the components: flush the heater core and changeover valve (located in the right front wheel
arch) in the opposite direction of flow until no debris remains.
Once the tool arrives, proceed with flushing the vehicle per the instructions attached in this LI. A picture of the filter after each flush must be taken.
If after the prescribed number of flushing attempts debris is still being collected in the filter, upload all the pictures to
the TIPS case and wait for next steps.
A scale of not-acceptable to acceptable debris level in the filter is in the attachments for you to make an assessment
as well.
Attachments
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© Copyright Mercedes-Benz AG
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Description
MFA2 CLA45_GLA45 Flushing Tool Use.pdf
CLA45, GLA45
ENG_Work instructions for rinsing routine M139 BR206
C43 rev_1.2.pdf
C43
206 C63 Flushing Tool Use.pdf
C63
ENG_Work instructions for rinsing routine M139
BR232_SL43_rev_1.2.pdf
SL43
254 GLC43 Flushing Tool Use.pdf
GLC43
254 GLC63 Flushing Tool Use.pdf
GLC63
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
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
A0995000202
ADDITIONAL RADIATOR
1
GLC43
X
A0995004800
ADDITIONAL RADIATOR
1
C43/SL43 (only if equipped)
X
A0995005901
COOLANT RADIATOR
1
CLA45/GLA45
X
A0995008501
COOLANT RADIATOR
1
C43/SL43
X
A1390104104
M139Q ENGINE
1
CLA45/GLA45 (Only order if instructed via TIPS)
X
A1390104202
M139L (SL43 ENGINE)
1
SL43 (Only order if instructed via
TIPS)
X
A1390107004
M139L (C43 ENGINE)
1
C43 (Only order if instructed via
TIPS)
X
A1392002202
1
All Models
X
A1775008600
COOLANT EXPANSION
RESERVOIR
1
CLA45/GLA45
X
A2065003400
COOLANT EXPANSION
RESERVOIR
1
C43/SL43/GLC43
X
A2545003700
COOLANT RADIATOR
1
GLC43
X
Control unit/fault code
Control unit
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© Copyright Mercedes-Benz AG
Fault text
CCUSHWA
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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
Time
540650
Maintain Voltage
0.1
541011
Quick Test
0.2
202470
Thermostat
3.5
547989
Ground Line
0.1
611075
Belly pan center
0.3
611071
Belly Pan front
0.4
401580
Wheel R&R
0.3
201145
Coolant Drain/Fill
0.3
831762
A/C Extract/Fill
0.6
82112-
Adjust Headlamp
0.6
20-000
Gut Thermostat
NONTime
203865
Radiator
3.9
203820
Additional Radiator
0.6
881319
Parktronic
0.1
881934
360 Camera
0.3
201030
Install Filter Device and Perform Flushing Routine
ZM
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© Copyright Mercedes-Benz AG
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Damage
code
Note
Page 7 / 7
- Formulated to replace the OEM fluid in Asian make vehicles...
- 5 year/150, 000 mile . Silicate-free, long-life, phosphate...
- The long life formula provides protection for all cooling...
- Meets the following OEM and industry specifications: JIS K...
- Note: Please check the vehicle specification before...
- 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: LI20.10-P-076206
Replacement Service Bulletin Number:
MFR Communication Date: 2025-01-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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