Mercedes OBD Codes List: Your Comprehensive Guide to Diagnostics
Mercedes Obd Codes List: Diagnosing and resolving issues in your Mercedes-Benz can be straightforward with the right tools and information, and CARDIAGTECH.NET provides both. This extensive guide offers a breakdown of Mercedes OBD codes, their meanings, potential causes, and how to address them, ensuring your vehicle runs smoothly and efficiently. Armed with this knowledge, you’ll be well-equipped to tackle car diagnostic challenges, identify engine diagnostic trouble codes, and effectively use your car code reader.
1. Understanding Mercedes Fault Codes
What are Mercedes fault codes and why are they important?
A fault code, also known as a Diagnostic Trouble Code (DTC), is a system code error that indicates a malfunction in your Mercedes-Benz. These codes are essential because they provide a starting point for diagnosing issues, saving time and money on unnecessary repairs, and ensuring your Mercedes operates at its best. According to the Society of Automotive Engineers (SAE), standardized OBD-II codes have been in use since 1996, making diagnostics more accessible. Let’s explore how these codes work.
- Diagnostic Trouble Codes (DTCs): Standardized codes used to identify specific issues within a vehicle’s systems.
- Importance: Help pinpoint the source of a problem, reducing diagnostic time and repair costs.
- Triggering a Fault Code: When a sensor detects an issue or a reading outside the acceptable range, it triggers a fault code.
1.1 How Fault Codes are Triggered in Mercedes
How do Mercedes vehicles generate and display fault codes?
Newer Mercedes models trigger a dashboard light or error message when a fault code is registered, alerting you to the need for inspection and diagnosis. The onboard computer monitors hundreds of systems, sensors, and variables, and any deviation from the norm results in a fault code. By understanding how these codes are triggered, you can better interpret the alerts your car provides.
- Onboard Computer Monitoring: Mercedes’ computers constantly monitor various systems and sensors.
- Deviation Detection: When a system or sensor reading falls outside the specified parameters, a fault code is generated.
- Dashboard Alerts: The fault code triggers a warning light or error message on the dashboard, prompting the driver to seek attention.
1.2 Using an OBD-II Scanner
How can an OBD-II scanner help read and interpret Mercedes fault codes?
An OBD-II scanner connects to your Mercedes’ OBD-II port, reads stored fault codes, and provides descriptions of the issues. This tool enables you to understand the problem before visiting a mechanic, allowing for informed discussions and potentially saving on diagnostic costs. Ensure your scanner is compatible with Mercedes-Benz vehicles for accurate readings.
- Connection: Plug the OBD-II scanner into the OBD-II port, typically located under the dashboard.
- Code Retrieval: The scanner reads and displays any stored fault codes.
- Code Interpretation: The scanner provides a brief description of each fault code, helping you understand the potential issue.
1.3 Common Mercedes Error Messages
What are some common Mercedes error messages and their potential meanings?
Common error messages in Mercedes vehicles include “Check Engine,” “Brake,” and “Temperature” warnings. These messages indicate that the onboard computer has detected an issue, but they don’t provide specific details. Using an OBD-II scanner or consulting a Mercedes specialist can help you understand the underlying problem and determine the necessary course of action.
- Check Engine: Indicates a problem with the engine or related systems.
- Brake: Suggests an issue with the braking system, such as low brake fluid or worn brake pads.
- Temperature: Indicates an overheating engine or a problem with the cooling system.
2. Decoding Specific Mercedes Fault Codes
2.1 Mercedes Fault Code: P261F71
What does the P261F71 fault code mean for Mercedes vehicles?
The fault code P261F71 indicates a malfunction in the output for the circulation pump, specifically that the actuator is blocked, commonly found in Mercedes Sprinter Vans. This issue can lead to coolant intrusion into the vacuum system via the water pump, affecting engine performance and potentially causing severe damage if left unattended. Addressing this requires a master-level technician to prevent further complications.
- Meaning: The output for the circulation pump has a malfunction, with the actuator being blocked.
- Known Problem: Common in Mercedes Sprinter Vans.
- Likely Causes: Coolant intrusion into the vacuum system via the water pump.
Table: Details of Mercedes Fault Code P261F71
| Detail | Description |
|---|---|
| Fault Code Meaning | The output for circulation pump has a malfunction. Actuator is blocked. |
| Known Problem Of | Mercedes Sprinter Vans |
| Likely Causes | Coolant intrusion into vacuum system via the water pump. |
| What’s Happening? | On model OM651 4 Cylinder Diesel Engine, the coolant water pump is vacuum actuated. The internal seal in the waterpump gives way and allows coolant (antifreeze) to enter the vacuum system, causing havoc on the entire vacuum system. |
| Possible Symptoms | Check Engine Light, little to no acceleration, coolant leak, brake pedal pressure issues, engine overheating. |
| Parts That Could Need Replacement | Water pump, coolant, seals, tubes, hoses, vacuum actuators, vacuum pump. |
| System(s) Affected | Engine, Cooling System, Vacuum System, Turbocharging, Brake System. |
| Severity | Very severe if left unfixed. Requires a master-level technician. |
2.2 Mercedes Fault Code: P126A00
What does the P126A00 fault code signify, particularly in OM642 engines?
The fault code P126A00 indicates that the intake port shutoff actuator is faulty in Mercedes Sprinter Vans, often due to clogged intake manifolds with EGR soot. This buildup causes the intake swirl flaps to stick, which in turn binds the actuator motor, leading to a check engine light and a potential loss of acceleration. This issue requires professional attention to ensure proper engine function.
- Meaning: Intake Port Shutoff Actuator is faulty.
- Known Problem: Common in Mercedes Sprinter Vans.
- Likely Causes: Failure of components: intake manifolds or the intake manifold actuator motor.
Table: Details of Mercedes Fault Code P126A00
| Detail | Description |
|---|---|
| Fault Code Meaning | Intake Port Shutoff Actuator is faulty. |
| Known Problem Of | Mercedes Sprinter Vans |
| Likely Causes | Failure of component: intake manifolds or the intake manifold actuator motor. |
| What’s Happening? | Over time (several thousand miles) 50-100k miles, the inside of the intake manifolds get clogged with EGR soot, buildup causing the intake swirl flaps to stick. The sticking or binding of these flaps then binds the motor which causes the check engine light and/or a severe loss of acceleration. |
| Possible Symptoms | Check Engine Light, loss of acceleration. |
| Parts That Could Need Replacement | Intake manifolds, intake manifold actuator motor. |
| System(s) Affected | Engine |
| Severity | Can be very severe if left unfixed. Repair requires a master-level technician. |
2.3 P0400 Mercedes Fault Codes
What do the P0400 series fault codes generally indicate in Mercedes vehicles?
The P0400 series fault codes in Mercedes vehicles generally pertain to issues with the exhaust gas recirculation (EGR) system, exhaust pressure, and cooling fan circuits. These codes can range from sensor malfunctions to circuit performance problems, affecting engine efficiency and emissions control. Addressing these issues promptly can prevent further damage and maintain optimal vehicle performance.
- General Meaning: Issues with the exhaust gas recirculation (EGR) system, exhaust pressure, and cooling fan circuits.
- Affected Systems: Engine, emissions control system, cooling system.
- Potential Problems: Sensor malfunctions, circuit performance issues, valve problems.
Table: P0400 Mercedes Fault Codes Meaning
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| P0466 | Purge Flow Sensor Circuit Range/Performance |
| P0467 | Purge Flow Sensor Circuit Low Input |
| P0468 | Purge Flow Sensor Circuit High Input |
| P0469 | Purge Flow Sensor Circuit Intermittent |
| P0470 | Exhaust Pressure Sensor Malfunction |
| P0471 | Exhaust Pressure Sensor Range/Performance |
| P0472 | Exhaust Pressure Sensor Low |
| P0473 | Exhaust Pressure Sensor High |
| P0474 | Exhaust Pressure Sensor Intermittent |
| P0475 | Exhaust Pressure Control Valve Malfunction |
| P0476 | Exhaust Pressure Control Valve Range/Performance |
| P0477 | Exhaust Pressure Control Valve Low |
| P0478 | Exhaust Pressure Control Valve High |
| P0479 | Exhaust Pressure Control Valve Intermittent |
| P0480 | Cooling Fan 1 Control Circuit Malfunction |
| P0481 | Cooling Fan 2 Control Circuit Malfunction |
| P0482 | Cooling Fan 3 Control Circuit Malfunction |
| P0483 | Cooling Fan Rationality Check Malfunction |
| P0484 | Cooling Fan Circuit Over Current |
| P0485 | Cooling Fan Power/Ground Circuit Malfunction |
2.4 P0500 Mercedes Fault Codes
What do P0500 series fault codes typically indicate in Mercedes vehicles?
The P0500 series fault codes in Mercedes vehicles typically point to issues with the vehicle speed sensor (VSS), idle control system, and various sensor circuits such as oil pressure, A/C refrigerant pressure, and power steering pressure. These codes can affect vehicle speed readings, engine idle stability, and the performance of related systems. Addressing these codes ensures accurate vehicle operation and system performance.
- General Meaning: Issues with the vehicle speed sensor (VSS), idle control system, and various sensor circuits.
- Affected Systems: Vehicle speed monitoring, engine idle control, A/C system, power steering system.
- Potential Problems: Sensor malfunctions, circuit performance issues, system voltage problems.
Table: P0500 Mercedes Fault Codes Meaning
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| P0500 | Vehicle Speed Sensor Malfunction |
| P0501 | Vehicle Speed Sensor Range/Performance |
| P0502 | Vehicle Speed Sensor Low Input |
| P0503 | Vehicle Speed Sensor Intermittent/Erratic/High |
| P0505 | Idle Control System Malfunction |
| P0506 | Idle Control System RPM Lower Than Expected |
| P0507 | Idle Control System RPM Higher Than Expected |
| P0510 | Closed Throttle Position Switch Malfunction |
| P0520 | Engine Oil Pressure Sensor/Switch Circuit Malfunction |
| P0521 | Engine Oil Pressure Sensor/Switch Circuit Range/Performance |
| P0522 | Engine Oil Pressure Sensor/Switch Circuit Low Voltage |
| P0523 | Engine Oil Pressure Sensor/Switch Circuit High Voltage |
| P0530 | A/C Refrigerant Pressure Sensor Circuit Malfunction |
| P0531 | A/C Refrigerant Pressure Sensor Circuit Range/Performance |
| P0532 | A/C Refrigerant Pressure Sensor Circuit Low Input |
| P0533 | A/C Refrigerant Pressure Sensor Circuit High Input |
| P0534 | Air Conditioner Refrigerant Charge Loss |
| P0550 | Power Steering Pressure Sensor Circuit Malfunction |
| P0551 | Power Steering Pressure Sensor Circuit Range/Performance |
| P0552 | Power Steering Pressure Sensor Circuit Low Input |
| P0553 | Power Steering Pressure Sensor Circuit High Input |
| P0554 | Power Steering Pressure Sensor Circuit Intermittent |
| P0560 | System Voltage Malfunction |
| P0561 | System Voltage Unstable |
| P0562 | System Voltage Low |
| P0563 | System Voltage High |
| P0565 | Cruise Control On Signal Malfunction |
| P0566 | Cruise Control Off Signal Malfunction |
| P0567 | Cruise Control Resume Signal Malfunction |
| P0568 | Cruise Control Set Signal Malfunction |
| P0569 | Cruise Control Coast Signal Malfunction |
| P0570 | Cruise Control Accel Signal Malfunction |
| P0571 | Cruise Control/Brake Switch A Circuit Malfunction |
| P0572 | Cruise Control/Brake Switch A Circuit Low |
| P0573 | Cruise Control/Brake Switch A Circuit High |
| P0574 | Cruise Control Related Malfunction |
| P0575 | Cruise Control Related Malfunction |
| P0576 | Cruise Control Related Malfunction |
| P0578 | Cruise Control Related Malfunction |
| P0579 | Cruise Control Related Malfunction |
| P0580 | Cruise Control Related Malfunction |
2.5 P0600 Mercedes Fault Codes
What do the P0600 series fault codes generally mean for Mercedes vehicles?
The P0600 series fault codes in Mercedes vehicles typically relate to issues within the control module, including memory errors, programming errors, and communication malfunctions. These codes can affect various systems managed by the control module, such as the engine, transmission, and generator. Addressing these issues often requires professional diagnostic tools and expertise.
- General Meaning: Issues within the control module, including memory errors, programming errors, and communication malfunctions.
- Affected Systems: Engine control module (ECM), transmission control module (TCM), generator control circuit.
- Potential Problems: Internal control module memory errors, programming errors, serial communication link malfunctions.
Table: P0600 Mercedes Fault Codes Meaning
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| P0600 | Serial Communication Link Malfunction |
| P0601 | Internal Control Module Memory Check Sum Error |
| P0602 | Control Module Programming Error |
| P0603 | Internal Control Module Keep Alive Memory (KAM) Error |
| P0604 | Internal Control Module Random Access Memory (RAM) Error |
| P0605 | Internal Control Module Read Only Memory (ROM) Error |
| P0606 | PCM Processor Fault |
| P0608 | Control Module VSS Output “A” Malfunction |
| P0609 | Control Module VSS Output “B” Malfunction |
| P0620 | Generator Control Circuit Malfunction |
| P0621 | Generator Lamp “L” Control Circuit Malfunction |
| P0622 | Generator Field “F” Control Circuit Malfunction |
| P0650 | Malfunction Indicator Lamp (MIL) Control Circuit Malfunction |
| P0654 | Engine RPM Output Circuit Malfunction |
| P0655 | Engine Hot Lamp Output Control Circuit Malfunction |
| P0656 | Fuel Level Output Circuit Malfunction |
2.6 P0700 Mercedes Fault Codes
What is the typical meaning of the P0700 series fault codes in Mercedes vehicles?
The P0700 series fault codes in Mercedes vehicles generally indicate issues with the transmission control system, torque converter, and shift solenoids. These codes can affect gear shifting, transmission performance, and overall vehicle drivability. Proper diagnosis and repair are crucial to prevent further damage to the transmission.
- General Meaning: Issues with the transmission control system, torque converter, and shift solenoids.
- Affected Systems: Transmission control system, torque converter, shift solenoids.
- Potential Problems: Transmission control system malfunctions, torque converter clutch circuit problems, shift solenoid issues.
Table: P0700 Mercedes Fault Codes Meaning
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| P0700 | Transmission Control System Malfunction |
| P0701 | Transmission Control System Range/Performance |
| P0702 | Transmission Control System Electrical |
| P0703 | Torque Converter/Brake Switch B Circuit Malfunction |
| P0704 | Clutch Switch Input Circuit Malfunction |
| P0705 | Transmission Range Sensor Circuit malfunction (PRNDL Input) |
| P0706 | Transmission Range Sensor Circuit Range/Performance |
| P0707 | Transmission Range Sensor Circuit Low Input |
| P0708 | Transmission Range Sensor Circuit High Input |
| P0709 | Transmission Range Sensor Circuit Intermittent |
| P0710 | Transmission Fluid Temperature Sensor Circuit Malfunction |
| P0711 | Transmission Fluid Temperature Sensor Circuit Range/Performance |
| P0712 | Transmission Fluid Temperature Sensor Circuit Low Input |
| P0713 | Transmission Fluid Temperature Sensor Circuit High Input |
| P0714 | Transmission Fluid Temperature Sensor Circuit Intermittent |
| P0715 | Input/Turbine Speed Sensor Circuit Malfunction |
| P0716 | Input/Turbine Speed Sensor Circuit Range/Performance |
| P0717 | Input/Turbine Speed Sensor Circuit No Signal |
| P0718 | Input/Turbine Speed Sensor Circuit Intermittent |
| P0719 | Torque Converter/Brake Switch B Circuit Low |
| P0720 | Output Speed Sensor Circuit Malfunction |
| P0721 | Output Speed Sensor Range/Performance |
| P0722 | Output Speed Sensor No Signal |
| P0723 | Output Speed Sensor Intermittent |
| P0724 | Torque Converter/Brake Switch B Circuit High |
| P0725 | Engine Speed input Circuit Malfunction |
| P0726 | Engine Speed Input Circuit Range/Performance |
| P0727 | Engine Speed Input Circuit No Signal |
| P0728 | Engine Speed Input Circuit Intermittent |
| P0730 | Incorrect Gear Ratio |
| P0731 | Gear 1 Incorrect Ratio |
| P0732 | Gear 2 Incorrect Ratio |
| P0733 | Gear 3 Incorrect Ratio |
| P0734 | Gear 4 Incorrect Ratio |
| P0735 | Gear 5 Incorrect Ratio |
| P0736 | Reverse Incorrect Gear Ratio |
| P0740 | Torque Converter Clutch Circuit Malfuction |
| P0741 | Torque Converter Clutch Circuit Performance or Stuck Off |
| P0742 | Torque Converter Clutch Circuit Stuck On |
| P0743 | Torque Converter Clutch Circuit Electrical |
| P0744 | Torque Converter Clutch Circuit Intermittent |
| P0745 | Pressure Control Solenoid Malfunction |
| P0746 | Pressure Control Solenoid Performance or Stuck Off |
| P0747 | Pressure Control Solenoid Stuck On |
| P0748 | Pressure Control Solenoid Electrical |
| P0749 | Pressure Control Solenoid Intermittent |
| P0750 | Shift Solenoid A Malfunction |
| P0751 | Shift Solenoid A Performance or Stuck Off |
| P0752 | Shift Solenoid A Stuck On |
| P0753 | Shift Solenoid A Electrical |
| P0754 | Shift Solenoid A Intermittent |
| P0755 | Shift Solenoid B Malfunction |
| P0756 | Shift Solenoid B Performance or Stuck Off |
| P0757 | Shift Solenoid B Stuck On |
| P0758 | Shift Solenoid B Electrical |
| P0759 | Shift Solenoid B Intermittent |
| P0760 | Shift Solenoid C Malfunction |
| P0761 | Shift Solenoid C Performance or Stuck Off |
| P0762 | Shift Solenoid C Stuck On |
| P0763 | Shift Solenoid C Electrical |
| P0764 | Shift Solenoid C Intermittent |
| P0765 | Shift Solenoid D Malfunction |
| P0766 | Shift Solenoid D Performance or Stuck Off |
| P0767 | Shift Solenoid D Stuck On |
| P0768 | Shift Solenoid D Electrical |
| P0769 | Shift Solenoid D Intermittent |
| P0770 | Shift Solenoid E Malfunction |
| P0771 | Shift Solenoid E Performance or Stuck Off |
| P0772 | Shift Solenoid E Stuck On |
| P0773 | Shift Solenoid E Electrical |
| P0774 | Shift Solenoid E Intermittent |
| P0780 | Shift Malfunction |
| P0781 | 1-2 Shift Malfunction |
| P0782 | 2-3 Shift Malfunction |
| P0783 | 3-4 Shift Malfunction |
| P0784 | 4-5 Shift Malfunction |
| P0785 | Shift/Timing Solenoid Malfunction |
| P0786 | Shift/Timing Solenoid Range/Performance |
| P0787 | Shift/Timing Solenoid Low |
| P0788 | Shift/Timing Solenoid High |
| P0789 | Shift/Timing Solenoid Intermittent |
| P0790 | Normal/Performance Switch Circuit Malfunction |
2.7 P0800 Mercedes Fault Codes
What do P0800 series fault codes typically refer to in Mercedes vehicles?
The P0800 series fault codes in Mercedes vehicles generally pertain to issues with the transmission’s control circuits, clutch position sensor, and 4-wheel drive switch. These codes can affect the transmission’s ability to shift properly, engage the clutch, or switch between drive modes. Addressing these issues promptly is crucial for maintaining optimal vehicle performance and preventing further damage.
- General Meaning: Issues with the transmission’s control circuits, clutch position sensor, and 4-wheel drive switch.
- Affected Systems: Transmission control circuits, clutch system, 4-wheel drive system.
- Potential Problems: Malfunctions in control circuits, sensor performance issues, switch malfunctions.
Table: P0800 Mercedes Fault Codes Meaning
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| P0801 | Reverse Inhibit Control Circuit Malfunction |
| P0803 | 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction |
| P0804 | 1-4 Upshift (Skip Shift) Lamp Control Circuit Malfunction |
| P0805 | Clutch Position Sensor Circuit Malfunction |
| P0806 | Clutch Position Sensor Circuit Range/Performance |
| P0807 | Clutch Position Sensor Circuit Low |
| P0808 | Clutch Position Sensor Circuit High |
| P0809 | Clutch Position Sensor Circuit Intermittent Ckt |
| P0810 | Clutch Position Control Malfunction |
| P0811 | Clutch Slippage Excessive |
| P0812 | Reverse Input Circuit Malfunction |
| P0813 | Reverse Output Circuit Malfunction |
| P0814 | Trans Range Display Circuit Malfunction |
| P0815 | Upshift Switch Circuit Malfunction |
| P0816 | Downshift Switch Circuit Malfunction |
| P0817 | Starter Disable Circuit |
| P0818 | Driveline Disconn. Switch Input |
| P0820 | Gear Lever X-Y Sensor Circuit |
| P0821 | Gear Lever X Sensor Circuit |
| P0822 | Gear Lever Y Sensor Circuit |
| P0823 | Gear Lever X Sensor Circuit Intermittent Ckt |
| P0824 | Gear Lever Y Sensor Circuit Intermittent Ckt |
| P0830 | Clutch Position Switch A Circuit Malfunction |
| P0831 | Clutch Position Switch A Circuit Low |
| P0832 | Clutch Position Switch A Circuit High |
| P0833 | Clutch Position Switch B Circuit Malfunction |
| P0834 | Clutch Position Switch B Circuit Low |
| P0835 | Clutch Position Switch B Circuit High |
| P0836 | 4 Wheel Drive Switch Circuit Malfunction |
| P0837 | 4 Wheel Drive Switch CKT Range/Perf |
| P0838 | 4 Wheel Drive Switch Circuit Low |
| P0839 | 4 Wheel Drive Switch Circuit High |
| P0840 | Trans Fluid Press Sensor/Switch A Circuit Malfunction |
| P0841 | Trans Fluid Press Sensor/Switch A CKT Range/Perf |
| P0842 | Trans Fluid Press Sensor/Switch A Circuit Low |
| P0843 | Trans Fluid Press Sensor/Switch A Circuit High |
| P0844 | Trans Fluid Press Sensor/Switch A CKT Intermittent |
| P0845 | Trans Fluid Press Sensor/Switch B Circuit Malfunction |
| P0846 | Trans Fluid Press Sensor/Switch B CKT Range/Perf |
| P0847 | Trans Fluid Press Sensor/Switch B Circuit Low |
| P0848 | Trans Fluid Press Sensor/Switch B Circuit High |
| P0849 | Trans Fluid Press Sensor/Switch B CKT Intermittent |
2.8 P1000-P2000 Mercedes Fault Codes
What is the general nature of P1000-P2000 fault codes in Mercedes vehicles?
The P1000-P2000 fault codes in Mercedes vehicles cover a broad range of issues, from electronic gear selector module defects to problems with the NOx trap efficiency and throttle actuator control. These codes often require specialized diagnostic tools and knowledge to accurately identify and resolve the underlying issues. Addressing these codes ensures various systems operate correctly and the vehicle meets emission standards.
- General Meaning: A broad range of issues, including electronic gear selector module defects, NOx trap efficiency problems, and throttle actuator control issues.
- Affected Systems: Electronic gear selector, emission control system, throttle control system.
- Potential Problems: Module defects, sensor malfunctions, circuit issues, software incompatibility.
Table: P1000-P2000 Mercedes Fault Codes Meaning
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| P1000 | Electronic Gear Selector Module: Defective N15/5 |
| P1228 | Yet unknown code on 1997 C 220 CDI |
| P1386 | Knock control |
| P1570 | Intermittant No-Start Immobiliser Module |
| P1747 | Electronic Gear Selector Module: Defective Interaction of CAN with control unit A1(instrument cluster) |
| P1750 | Electronic Gear Selector Module: Very low control unit supply voltage |
| P1832 | Electronic Gear Selector Module: SHORT in circuit N15/5 output stage |
| P1910 | Electronic Gear Selector Module: Control Unit over voltage |
| P1912 | Electronic Gear Selector Module: Weak touch push button voltage |
| P2000 | NOx Trap Efficiency Below Threshold (Bank 1) |
| P2001 | NOx Trap Efficiency Below Threshold (Bank 2) |
| P2003 | Particulate Trap Efficiency Below Threshold (Bank 1) |
| P2004 | Particulate Trap Efficiency Below Threshold (Bank 2) |
| P2031 | Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 2) |
| P2032 | Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2) |
| P2033 | Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 2) |
| P2080 | Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 1) |
| P2081 | Exhaust Gas Temperature Sensor Circuit intermittant (Bank 1 Sensor 1) |
| P2100 | Throttle Actuator Control Motor Circuit/Open |
| P2101 | Throttle Actuator Control Motor Circuit Range/Performance |
| P2208 | transmission: The speed of Y3/6n2 to Y3/6n3 is excessive |
3. Understanding Mercedes Body Fault Codes (B-Codes)
3.1 Common B-Codes in Mercedes Vehicles
What do body fault codes (B-codes) generally indicate in Mercedes vehicles?
Body fault codes (B-codes) in Mercedes vehicles typically relate to issues with the vehicle’s body systems, such as lighting, air conditioning, seat adjustments, and airbag systems. These codes can affect comfort, convenience, and safety features. Addressing these issues ensures all body systems function correctly and the vehicle remains safe and comfortable to operate.
- General Meaning: Issues with the vehicle’s body systems, such as lighting, air conditioning, seat adjustments, and airbag systems.
- Affected Systems: Lighting system, air conditioning system, seat adjustment system, airbag system.
- Potential Problems: Sensor malfunctions, circuit issues, control module problems, mechanical failures.
Table: Mercedes Body Fault Codes Meaning
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| B1000 | HRA Headlamp range adjustment: Supply voltage of the control unit is too low (undervoltage) |
| B1004 | LCP Lower Control Panel: Control unit does not match vehicle type |
| B1056 | Automatic Air Conditioning: Problem in CAN communication with control unit DCM-RL |
| B1201 | Electric seat adjustment front left: Hall sensor front height M27m3 |
| B1213 | If seat memory installed: ext right rearview mirror voltage faulty |
| B1214 | If seat memory installed: ext right rearview mirror voltage faulty |
| B1226 | In-car temperature sensor (B10/4) |
| B1227 | Outside temperature indicator temp sensor (014) |
| B1128 | Heater core temperature (B10/1) |
| B1229 | Heater core temperature (B10/1) |
| B1230 | Evaporator temperature sensor (B10/6) |
| B1231 | ECT sensor (B11/4) |
| B1232 | Refrigerant pressure sensor (B12) |
| B1233 | Refrigerant temperature sensor (B12/1) |
| B1234 | Sun sensor (B32) |
| B1235 | Emissions sensor (B31) |
| B1241 | Refrigerant Fill |
| B1246 | PTS Parktronic: A42b1 (left outer sensor, front bumper) The plug connection has poor contact or is loose, or the sensor or cable is faulty |
| B1310 | Left/Window airbag sensor is defective |
| B1315 | Problem in Front passenger child seat recognition |
| B1416 | Coolant circulation pump (M13) |
| B1417 | Duovalve (Y21y1), left |
| B1418 | Duovalve (Y21y2), right |
| B1419 | Electromagnetic clutch (A9k1) |
| B1420 | Idle speed increase |
| B1421 | Pulse module (N05) |
| B1422 | Series interface (K1) connection to instrument cluster (A1) |
| B1423 | Switchover valve block (Y11) |
| B1424 | Activated charcoal filler actuator (A32m2) open |
| B1425 | Activated charcoal filler actuator (A32m2) closed |
| B1432 | Non-USA DTC |
| B1459 | Series interface (K2) connection to instrument cluster (A1) |
| B1462 | Wide open throttle (WOT) position signal diesel engines |
| B1476 | Airbag |