News Channel Update |

Warranty

TO: Mercedes-Benz

Dealer Principals, General Managers,
Sales Managers, Service Managers, Parts Managers
Emission Extended Warranty – Engine Thermostat
(incl. software update) MY19-23, Various Models and
Platforms (167, 190, 205, 213, 217, 222, 223, 232, 253,
290, 463)
RE:

FROM: Teresa

Clemmer, Senior Manager – Warranty,
Gregory Gunther - Senior Manager, Vehicle
Compliance and Analysis, Engineering Services
DATE:

January 31, 2025

IMPORTANT EMISSION EXTENDED WARRANTY INFORMATION
This NCU supersedes the prior NCUs issued on December 1, 2023 and February 06, 2024 and includes additional MY 2019
AMG G63 vehicles.
In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our
customers, Mercedes-Benz USA, LLC (“MBUSA”) is extending the warranty coverage on the engine thermostat (including
software update) installed in certain Model Year (“MY”) vehicles (with engines M176, M177, M178) listed below from the original
New Vehicle Limited Warranty of 4 years/50,000 miles to 15 years/150,000 miles (whichever occurs first), due to the following
condition:
•

In the affected vehicles, the sealing ring in the engine thermostat could detach, causing a delay in the heating of the
engine coolant. This may also cause the check engine Malfunction Indicator Lamp (‘MIL’) to illuminate.
Model Model Years
C-Class 2020 – 2021,
2023
E-Class 2020 – 2021,
2023
G-Class 2019 – 2022
GLC-Class 2020 – 2021,
2023
GLE-Class 2020 – 2023
GLS-Class 2020 – 2023
GT-Class 2020 – 2021,
2023
S-Class 2020 – 2023

SL-Class 2022

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

Sales Designation
AMG C 63, AMG C 63 Convertible, AMG C 63 Coupe, AMG C 63 S,
AMG C 63 S Convertible, AMG C 63 S Coupe
AMG E 63 S 4MATIC, AMG E 63 S 4MATIC Wagon, AMG E 63 S
AMG E 63 S Wagon, AMG E 63 S 4MATIC+, AMG E 63 S 4MATIC+
Wagon
G 550, AMG G 63, AMG G 63 4x4²
AMG GLC 63 4MATIC, AMG GLC 63 4MATIC Coupe, AMG GLC 63 S
4MATIC Coupe, AMG GLC 63, AMG GLC 63 Coupe, AMG GLC 63 S
Coupe, AMG GLC 63 S 4MATIC+ Coupe
GLE 580 4MATIC, AMG GLE 63 S, AMG GLE 63 S Coupe, AMG GLE 63
S 4MATIC+, AMG GLE 63 S 4MATIC+ Coupe
GLS 580 4MATIC, AMG GLS 63, GLS 600 4MATIC Maybach,
AMG GLS 63 4MATIC+
AMG GT 63, AMG GT 63 S, AMG GT C Coupe, AMG GT C Roadster,
AMG GT Coupe, AMG GT R Coupe, AMG GT R Roadster, AMG GT
Roadster, AMG GT Black Series Coupe, AMG GT 63 4MATIC+, AMG GT
63 S 4MATIC+
AMG S 63 4MATIC, AMG S 63 4MATIC Convertible, AMG S 63 4MATIC
Coupe, S 560, S 560 4MATIC, S 560 4MATIC Coupe, S 560 4MATIC
Maybach, S 560 Convertible, AMG S 63 Convertible, AMG S 63 Coupe
S 580 4MATIC, S 580 4MATIC Maybach
AMG SL 55 4MATIC+, AMG SL 63 4MATIC+

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

News Channel Update |

Warranty

Please follow the work instructions added to this NCU to remedy the issue. Please be advised that all repairs being claimed
under this extended warranty must have a quick test uploaded with the following fault code information and may be audited.
•

P012800 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

All repairs found to be functioning properly or without proper documentation will be returned and the claim debited in full.
Only the following damage codes and parts may be claimed for the aforementioned repairs:
Damage Code(s):
•

20102 – Insert, coolant thermostat
o 52 – Does not operate correctly
o 41 – Hard closing

•

20103 – Housing/cover, coolant thermostat
o 73 – Electrical fault

•

2030T - Heating element, coolant thermostat
o 53 – Insufficient effect/power
o 73 – Electrical fault

Part(s): Quantity

Part Name

Part Number

01

Thermostat

*

*The replacement parts must be determined according to the equipment variant for the vehicle identification number via the parts process in Xentry
Portal.

Software:
•

N3/10 - Motor electronics software update (see work instructions)

Please note that damage incurred from abuse, accidents, vandalism or other non-warrantable causes that are not covered by
the New Vehicle Limited Warranty are similarly not covered by this Extended Warranty.
IMPORTANT:
1) Always check VMI to determine if a vehicle is covered under the15 years/150,000 miles warranty period.
2) Quick Test Documentation with fault code information must be uploaded to pXD.
Please check the VIN in NetStar/VMI before scheduling the appointment for the repair. Applicable vehicles will be visible in
NetStar/VMI on December 01, 2023.
Approximately two weeks after the posting of this NCU, a letter will be sent to owners notifying them of the warranty
extension. If customers have already paid to have a repair related to the conditions specified above, they may be eligible for
reimbursement. Please advise the customer to follow the instructions detailed below.

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

News Channel Update |

Warranty

Reimbursement to Customers for Valid Repairs Performed Prior to Warranty Extension
Customers who have already paid to have a repair to the Engine Thermostat (including software update), resulting in a
check engine MIL activation may be eligible to receive reimbursement.
Requests for reimbursement may include expenses for Mercedes-Benz replacement parts, labor, fees and taxes. Requests
for reimbursement costs that were not related to the aforementioned conditions will not be honored.
Reimbursement may be limited to the amount the repair would have cost if completed by an authorized MercedesBenz dealership and repairs performed by a non-Mercedes-Benz dealership might not be reimbursed.
The following documentation must be presented to the servicing or closest Mercedes-Benz dealership for
reimbursement.
Original or clear copy of all receipts, invoices and/or repair orders that show:
• The name and address of the person who paid for the repair.
• The Vehicle Identification Number (VIN) of the vehicle that was repaired.
• What problem occurred, what repair was done, when it was done and who repaired it.
• Only Mercedes-Benz replacement parts were used for the repair.
• Fault Code (DTCs) information belonging to this Warranty Extension (if any).
• The total cost of the repair expense that is being claimed.
• Proof of payment for the repair (copy of front and back of cancelled check, or copy of credit card receipt).
• Reimbursement will be paid by a check from an authorized Mercedes-Benz dealership, which may take up to
60 days.

Should you have any questions or concerns, please do not hesitate to open a OneTRAC case online.

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

News Channel Update |

Warranty

Work Procedure
1. Connect XENTRY/DAS.
2. Check if software update for N3/10-Motor electronics is available and update if necessary.
To do this, select menu item "Quick test view – N3/10-Motor electronics - Adaptations –
Control unit update – Updating of control unit software"
Then follow the user guidance in XENTRY Diagnosis.
3. Perform guided test for R48 (coolant thermostat heating element)
Step 3 is not applicable to chassis 463.261 (G 550), please proceed with Work Procedure A
To do this, select menu item "Quick test view – N3/10-Motor electronics – Test.”
Then follow the user guidance in XENTRY Diagnosis.
a. If Not OK - perform Work Procedure A
b. If OK - Continue with Step 4
4. Check clean point for engine serial number of the affected vehicle via VeDoc
NOTE: Review Warranty Repair history – if thermostat has been replaced following the listed
damage codes above, VeDoc check can be skipped and proceed with Work Procedure A
a.
b.
c.
d.

Look up the engine number in VeDoc
Identify engine type, first 6 digits (Figure 1)
Identify engine serial number, last 6 digits (Figure 1)
Compare the engine and serial number with the table (Figure 2)

Figure 1

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

News Channel Update |

Engine Type
176980
177880
177980
178xxx

Warranty

Engine Number Table

Serial Number
152330
218395
218387
All thermostats Not OK

Figure 2

a. If engine serial # from VeDoc is Not OK (smaller) than listed in table (Figure 2) - perform Work
Procedure A
b. If engine serial # from VeDoc is OK (greater) than listed in table (Figure 2) - end work procedure
c. If engine serial # listed in table (Figure 2) as “All thermostats Not OK” - perform Work Procedure A

Work Procedure A
1. Replace Thermostat and R48 (coolant thermostat heating element)
For basic data see, AR20.10-P-2461*
* WIS document has to be selected by VIN
Note: The following allowable labor operation should be used when submitting a warranty claim for
N3/10 – Motor Electronics Software Update in this repair:
Warranty Information
Description

Op. Code

Labor Time
(hrs.)

02-4762*

Operations: Connect/disconnect vehicle diagnosis system
(XENTRY Diagnosis)

0.1

02-5058*

Operations: Connect/disconnect charger for starter battery
(XENTRY Diagnosis connected)

0.1

02-9334

Operations: Update Engine Control Unit software
(with XENTRY Diagnosis connected)

0.1

* Invoice operation item only once for each workshop order!
Note: Always check Xentry Operation Time (XOT) for the current OP-Code times. Labor times are subject to
change and updates may not be reflected in this document.

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600