Mercedes-Benz vehicles are known for their sophisticated engineering and advanced onboard computer systems. These systems constantly monitor various components, triggering diagnostic trouble codes (DTCs), also known as fault codes, when issues arise. Understanding these Mercedes fault codes is crucial for effective diagnostics and repairs. This comprehensive list provides detailed information on various Mercedes fault codes, categorized for easier navigation.
Understanding Mercedes Fault Codes
A fault code is a combination of letters and numbers that indicates a specific malfunction within your Mercedes. These codes are stored in the vehicle’s onboard computer and can be accessed using a diagnostic scanner. While a check engine light often accompanies a fault code, it rarely pinpoints the exact problem. A professional technician with access to a Mercedes Fault Codes List and a diagnostic scanner can accurately interpret these codes, leading to a proper diagnosis and efficient repair.
Common Mercedes Fault Code Categories
Mercedes fault codes are typically categorized using a letter and four-digit number system:
- P Codes: Refer to powertrain-related issues, encompassing engine, transmission, and emissions systems. Examples include P0400 (EGR Malfunction) or P0700 (Transmission Control System Malfunction). You will find expansive information related to P Codes in the tables below.
- B Codes: Relate to body systems, such as airbags, central locking, power windows, and air conditioning. An example is B1000 (Headlamp Range Adjustment Fault).
- C Codes: Indicate problems with the chassis systems, including ABS, ESP, and suspension. C1100 (Left Front Axle VSS Circuit Fault) is an example.
- U Codes: Represent network communication issues between different control modules in the vehicle. Examples are U0100 (Lost Communication with ECM/PCM) and others listed below.
Decoding Specific Mercedes Fault Codes
P0400 Series Mercedes Fault Codes
| Code | Description |
|---|---|
| P0466 | Purge Flow Sensor Circuit Range/Performance |
| P0470 | Exhaust Pressure Sensor Malfunction |
| P0480 | Cooling Fan 1 Control Circuit Malfunction |
P0500 Series Mercedes Fault Codes
| Code | Description |
|---|---|
| P0500 | Vehicle Speed Sensor Malfunction |
| P0505 | Idle Control System Malfunction |
| P0560 | System Voltage Malfunction |
P0600 Series Mercedes Fault Codes
| Code | Description |
|---|---|
| P0600 | Serial Communication Link Malfunction |
| P0601 | Internal Control Module Memory Check Sum Error |
| P0620 | Generator Control Circuit Malfunction |
P0700 Series Mercedes Fault Codes
| Code | Description |
|---|---|
| P0700 | Transmission Control System Malfunction |
| P0705 | Transmission Range Sensor Circuit Malfunction |
| P0710 | Transmission Fluid Temperature Sensor Circuit Malfunction |
P0800 Series Mercedes Fault Codes
| Code | Description |
|---|---|
| P0801 | Reverse Inhibit Control Circuit Malfunction |
| P0805 | Clutch Position Sensor Circuit Malfunction |
| P0840 | Trans Fluid Press Sensor/Switch A Circuit Malfunction |
P1000-P2000 Series Mercedes Fault Codes
| Code | Description |
|---|---|
| P1000 | Electronic Gear Selector Module: Defective |
| P2000 | NOx Trap Efficiency Below Threshold (Bank 1) |
Mercedes Body (B####) Fault Codes
| Code | Description |
|---|---|
| B1000 | Headlamp Range Adjustment: Supply Voltage Low |
| B1416 | Coolant Circulation Pump Malfunction |
Mercedes Chassis (C####) Fault Codes
| Code | Description |
|---|---|
| C1010 | Battery Voltage Low |
| C1100 | Left Front Axle VSS Circuit Fault |
| C1200 | Stop Light Switch Open/Shorted/Implausible |
Mercedes Network (U####) Fault Codes
| Code | Description |
|---|---|
| U0100 | Lost Communication with ECM/PCM A |
| U0101 | Lost Communication with TCM |
Importance of Professional Diagnostics
While this Mercedes fault codes list provides valuable information, it’s essential to consult a qualified Mercedes-Benz technician for accurate diagnosis and repair. They possess the expertise, specialized tools, and access to complete factory information to correctly interpret fault codes within the context of your specific vehicle. Attempting repairs based solely on code definitions can lead to misdiagnosis and potentially worsen the problem. Professional diagnostics ensure the correct repair is performed, saving you time and money in the long run.
