Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P154900There is a warning due to overcurrent in the charging system of the high-voltage electric circuit
Manufacturer communications
3Original wording in English
MERCEDES-BENZ
Complaint Vehicle will not start after DC charging Warning in the instrument cluster related to High‐voltage on board electrical system The following fault codes related to stuck contactor can be found in the High Voltage Control units : PTCU ‐ N127 (Powertrain control unit) • P154900 ‐ There is a warning due to overcurrent in t…
MERCEDES-BENZ
Vehicle not starting after DC charging Complaint Vehicle will not start after DC charging Warning in the instrument cluster related to High-voltage on board electrical system The following fault codes related to stuck contactor can be found in the High Voltage Control units : PTCU - N127 (Powertrain control unit) • P154900 - The…
MERCEDES-BENZ
Complaint Vehicle will not start after DC charging Warning in the instrument cluster related to High-voltage on board electrical system The following fault codes related to stuck contactor can be found in the High Voltage Control units : PTCU - N127 (Powertrain control unit) • P154900 - There is a warning due to overcurrent in t…
Check vehicle applicability
43A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Mercedes-Benz | AMG E 53 4MATIC+ WAGON ↗ | 2025 |
| Mercedes-Benz | AMG E 53 E 4MATIC+ ↗ | 2025 |
| Mercedes-Benz | AMG E53E ↗ | 2023 |
| Mercedes-Benz | AMG E53E 4MATIC ↗ | 2027 |
| Mercedes-Benz | AMG E53E 4MATIC WAGON ↗ | 2027 |
| Mercedes-Benz | AMG GLC63 S E ↗ | 2025 |
| Mercedes-Benz | AMG GLC63 S E 4MATIC+ ↗ | 2026 |
| Mercedes-Benz | AMG GLC63 S E 4MATIC+ ↗ | 2025 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
IMCC Circuit Malfunction, Bank B
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.