NHTSA ID Number: 11018921
Manufacturer Communication Number: LI14.20-N-079253
TSB/Document Date: 2025-06-03
Summary
Complaint The check engine light is activated, accompanied by the following fault code related to the Exhaust gas recirculation cooler (low pressure): •P300E55 The efficiency of component 'Exhaust gas recirculation cooler (low pressure)' is not sufficient. Cause The issue is attributed to an error in the coding of the climate control unit software (HVAC177). Remedy A software update to correct the coding error is currently in the process of release for the Aftersales network. In the interim, please proceed as follows: •Erase the fault memory (DTCs) from the control unit. •Return the vehicle to the customer. •No further diagnostic or repair procedures are required at this time.
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TSB/Document ID: LI14.20-N-079253
Replacement Service Bulletin Number:
MFR Communication Date: 2025-05-19
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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Check engine light with fault code P300E55 with H12
Topic number
LI14.20-N-079253
Version
2
Function group
14.20 - Exhaust gas recirculation
Date
5/19/25
Validity
Model 907 with OM654 and H12
Reason for change
Remedy Update
Complaint
The check engine light is activated, accompanied by the following fault code related to the Exhaust gas recirculation
cooler (low pressure):
•P300E55 The efficiency of component 'Exhaust gas recirculation cooler (low pressure)' is not sufficient.
Cause
The issue is attributed to an error in the coding of the climate control unit software (HVAC177).
Remedy
A software update to correct the coding error is currently in the process of release for the Aftersales network.
In the interim, please proceed as follows:
•Erase the fault memory (DTCs) from the control unit.
•Return the vehicle to the customer.
•No further diagnostic or repair procedures are required at this time.
Production Clean Points:
The following manufacturing plants have implemented the updated coding on the specified dates:
09/20/2024: VS30 – Plant W065, Düsseldorf
10/09/2024: VS30 – Plant W037, Ludwigsfelde & Plant W155, Buenos Aires
10/31/2024: VS30 – Plant W566, Charleston
This LI will be updated following approval and release of the corrective coding for After-sales use.
Additional Notes:
27.05.2025 16:59
© Copyright Mercedes-Benz
AG
CCUSHWA
Page 1 / 2
If the vehicle was produced after the plant clean point and has the fault code P300E55 with H12, please open a TIPS
case and direct it to the Powertrain inbox, referencing this LI.
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
Control unit/fault code
Control unit
Fault text
N3/40 - Motor electronics 'MRD1' for combustion engine
'OM654' (CDI) (MRD1NFZ)
P300E55 - The efficiency of component 'Exhaust gas recirculation cooler (low pressure)' is not sufficient.
Operation numbers/damage codes
Op. no.
Operation text
27.05.2025 16:59
© Copyright Mercedes-Benz AG
Time
CCUSHWA
Damage
code
Note
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