Mercedes DTC Code List: Your Ultimate Guide
Mercedes-Benz vehicles are renowned for their sophisticated engineering and advanced technology. To ensure these vehicles operate at peak performance, their onboard computers constantly monitor various systems, sensors, and parameters. When a problem arises, the computer generates a Diagnostic Trouble Code (DTC), also known as a fault code. Understanding the “Mercedes Dtc Code List” is crucial for accurate diagnosis and effective repairs.
At CARDIAGTECH.NET, we understand the importance of having the right tools and knowledge to tackle automotive repairs efficiently. That’s why we’ve compiled this comprehensive guide to help you navigate the world of Mercedes DTC codes, ensuring you can quickly identify issues and get your Mercedes-Benz back on the road. This guide will cover common error messages, specific code meanings, and how to use this information to diagnose and resolve problems.
1. Decoding Mercedes-Benz Diagnostic Trouble Codes (DTCs)
A Diagnostic Trouble Code (DTC), often referred to as a fault code, is a standardized system code error that signals a malfunction within your Mercedes-Benz vehicle. These codes are generated by the vehicle’s onboard computer when it detects an issue, ranging from minor sensor deviations to major system failures. In essence, DTCs provide a roadmap for technicians, guiding them to the source of the problem.
When a DTC is triggered in newer Mercedes models, it typically activates a dashboard warning light or displays an error message on the vehicle’s information screen. These alerts are designed to prompt you to seek professional inspection and diagnosis. Ignoring these warnings can lead to more significant and costly repairs down the line. For example, a seemingly minor issue like a loose gas cap, indicated by a DTC, can eventually affect the engine’s performance if left unaddressed.
1.1. Understanding DTC Categories
Mercedes DTCs are organized into several categories, each representing a different area of the vehicle’s systems. Understanding these categories can help narrow down the potential problem area.
Here’s a breakdown of common DTC categories:
- P (Powertrain): These codes relate to the engine, transmission, and related components.
- B (Body): Body codes pertain to systems within the vehicle’s body, such as airbags, central locking, and climate control.
- C (Chassis): Chassis codes refer to systems like ABS (Anti-lock Braking System), suspension, and steering.
- U (Network/Communication): These codes indicate communication issues between different control modules within the vehicle.
1.2. The Importance of Accurate Diagnosis
While a DTC provides a starting point, it’s crucial to avoid simply replacing the part indicated by the code. Accurate diagnosis involves a thorough inspection of the affected system, considering factors such as vehicle history, symptoms, and related components.
According to a study by the National Institute for Automotive Service Excellence (ASE), misdiagnosis is a significant issue in the automotive repair industry, leading to unnecessary repairs and increased costs for vehicle owners. Therefore, investing in professional diagnostic tools and training is essential for providing reliable and effective service. CARDIAGTECH.NET offers a range of diagnostic equipment specifically designed for Mercedes-Benz vehicles, ensuring that technicians can accurately pinpoint the root cause of problems.
1.3. How DTCs Improve Repair Efficiency
DTCs significantly enhance the efficiency of the repair process by providing technicians with a clear direction for investigation. Instead of blindly searching for the problem, technicians can use the DTC as a guide, saving time and reducing the risk of overlooking critical issues.
Moreover, DTCs enable technicians to communicate more effectively with vehicle owners, explaining the problem in clear and concise terms. This transparency builds trust and ensures that customers understand the necessary repairs. At CARDIAGTECH.NET, we believe that clear communication is just as important as technical expertise, and we strive to provide our customers with the tools and resources they need to excel in both areas.
2. Common Mercedes Error Messages Explained
Mercedes-Benz vehicles feature sophisticated onboard diagnostic systems that generate specific error messages, also known as Diagnostic Trouble Codes (DTCs), to alert drivers and technicians to potential issues. Each code corresponds to a particular problem, ranging from minor sensor malfunctions to more significant mechanical or electrical failures. Understanding these error messages is essential for maintaining your vehicle’s health and performance. Let’s examine some common Mercedes error messages and their potential causes.
2.1. P261F71: Circulation Pump Malfunction
| 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. |
| Possible Symptoms You May Experience | Check Engine Light, Little to no acceleration, Coolant leak, Brake Pedal Pressure, 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: | Can be very severe if left unfixed. Repair requires MASTER LEVEL Technician and not something for the DIYer. |
The fault code P261F71 indicates a malfunction in the circulation pump, with the actuator potentially blocked. This issue is commonly seen in Mercedes Sprinter Vans, particularly those with the OM651 4-cylinder diesel engine.
The primary cause is often coolant intrusion into the vacuum system due to a failing water pump seal. When this seal fails, coolant can enter the vacuum system, causing a variety of problems.
Symptoms:
- Check Engine Light: Illumination of the check engine light on the dashboard.
- Reduced Acceleration: Noticeable decrease in the vehicle’s acceleration performance.
- Coolant Leak: Visible coolant leak near the water pump area.
- Brake Pedal Issues: Changes in brake pedal pressure.
- Engine Overheating: The engine temperature rising above normal levels.
Affected Systems:
- Engine
- Cooling System
- Vacuum System
- Turbocharging
- Brake System
Potential Repairs:
Addressing this issue typically involves replacing the faulty water pump, coolant, seals, tubes, hoses, vacuum actuators, and vacuum pump. Due to the complexity of the repair, it’s recommended to seek assistance from a master-level technician.
2.2. P126A00: OM642 Engine Oil Cooler Leak
| Fault Code Meaning: | Intake Port Shutoff Actuator is faulty. |
|---|---|
| Known Problem Of: | Mercedes Sprinter Vans |
| Likely Causes: | Failure of component: intake manifolds |
| What’s Happening?: | Over time the inside of the intake manifolds get clogged with EGR soot, buildup causing the intake swirl flaps to stick. |
| Possible Symptoms You May Experience | |
| Parts That Could Need Replacement: | |
| System(s) Affected: | Engine |
| Severity: | Can be very severe if left unfixed. Repair requires MASTER LEVEL Technician and not something for the DIYer. |
The fault code P126A00 indicates that the Intake Port Shutoff Actuator is faulty. This issue is a known problem in Mercedes Sprinter Vans. The likely causes include the failure of intake manifolds, or the intake manifold actuator motor.
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 sever loss of acceleration.
Symptoms:
- Check Engine Light
- Severe Loss of Acceleration
Affected Systems:
- Engine
Potential Repairs:
Repair requires MASTER LEVEL Technician and not something for the DIYer.
2.3. Importance of Professional Diagnosis
When encountering these or other error messages, it’s critical to seek professional diagnosis from a qualified Mercedes-Benz technician. Attempting to self-diagnose and repair complex issues can lead to further damage and increased costs.
3. Comprehensive Mercedes-Benz Fault Code List
Navigating the complexities of Mercedes-Benz diagnostics requires a thorough understanding of fault codes. These codes, generated by the vehicle’s onboard computer, provide valuable insights into potential issues. Below is an extensive “Mercedes Dtc Code List” to aid in accurate diagnosis and efficient repairs.
3.1. P0400 Series: Exhaust Gas Recirculation (EGR) System
The P0400 series of fault codes relates to issues within the Exhaust Gas Recirculation (EGR) system. The EGR system is designed to reduce emissions by recirculating a portion of the exhaust gas back into the engine’s intake manifold. This process lowers combustion temperatures, reducing the formation of nitrogen oxides (NOx).
| 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 |
Common Issues and Solutions:
- Faulty EGR Valve: A malfunctioning EGR valve can cause a variety of issues, including rough idling, poor acceleration, and increased emissions. Replacement of the EGR valve may be necessary.
- Clogged EGR Passages: Over time, carbon deposits can accumulate in the EGR passages, restricting airflow and impairing the system’s performance. Cleaning the EGR passages can restore proper function.
- Sensor Malfunctions: Faulty sensors, such as the EGR pressure sensor or temperature sensor, can provide inaccurate data to the engine control unit (ECU), leading to incorrect EGR operation. Replacing the faulty sensor is usually the solution.
3.2. P0500 Series: Vehicle Speed Sensor (VSS)
The P0500 series of fault codes pertains to issues related to the Vehicle Speed Sensor (VSS). The VSS is responsible for measuring the vehicle’s speed and transmitting this information to the ECU, which uses it for various functions, including speedometer operation, transmission control, and cruise control.
| 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 |
| P0576 | Cruise Control Related Malfunction |
| P0578 | Cruise Control Related Malfunction |
| P0579 | Cruise Control Related Malfunction |
| P0580 | Cruise Control Related Malfunction |
Common Issues and Solutions:
- Faulty VSS: A malfunctioning VSS can result in an inaccurate speedometer reading, transmission shifting problems, and cruise control malfunctions. Replacement of the VSS is often necessary.
- Wiring Problems: Damaged or corroded wiring to the VSS can disrupt the signal transmission, leading to fault codes. Repairing or replacing the wiring can resolve the issue.
- Sensor Calibration: In some cases, the VSS may need to be calibrated to ensure accurate readings. This can be done using specialized diagnostic equipment.
3.3. P0600 Series: Internal Control Module
The P0600 series of fault codes relates to issues within the vehicle’s internal control modules, such as the engine control module (ECM) or transmission control module (TCM). These modules are responsible for managing various aspects of the vehicle’s operation, and any malfunction can have significant consequences.
| 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 |
Common Issues and Solutions:
- Module Failure: In some cases, the control module itself may fail due to internal component damage or electrical issues. Replacement of the module is often the only solution.
- Software Problems: Corrupted or outdated software can cause control module malfunctions. Reflashing the module with the latest software can resolve the issue.
- Communication Issues: Problems with the communication network between control modules can also trigger P0600 series codes. Diagnosing and repairing the communication network is essential.
3.4. P0700 Series: Transmission Control System
The P0700 series of fault codes indicates issues within the transmission control system. This system is responsible for managing gear shifts, torque converter operation, and other transmission-related functions.
| 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 |
Common Issues and Solutions:
- Solenoid Problems: Malfunctioning shift solenoids or pressure control solenoids can cause shifting problems and transmission performance issues. Replacing the faulty solenoid is often necessary.
- Sensor Issues: Faulty transmission fluid temperature sensors or speed sensors can provide inaccurate data to the TCM, leading to incorrect transmission operation. Replacing the faulty sensor is usually the solution.
- Fluid Leaks: Low transmission fluid levels due to leaks can cause shifting problems and transmission damage. Repairing the leak and replenishing the fluid is essential.
3.5. P0800 Series: Transmission Control System (TCM)
The P0800 series focuses on issues within the Transmission Control System (TCM), particularly related to clutch and gear-related functions.
| 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 |
Common Issues and Solutions:
- Clutch Position Sensor Issues: Problems with the clutch position sensor can lead to shifting difficulties. Replacement or recalibration of the sensor may be necessary.
- Gear Lever Sensor Problems: Malfunctions in the gear lever sensors can cause incorrect gear selection. Diagnostics and potential replacement of the sensors are essential.
- Fluid Pressure Sensor Malfunctions: Issues with transmission fluid pressure sensors can lead to incorrect readings and shifting problems. Replacement of the faulty sensor is typically the solution.
3.6. P1000-P2000 Series: Enhanced Powertrain Codes
The P1000-P2000 series comprises enhanced powertrain codes that are specific to the manufacturer. These codes provide more detailed information about the nature and location of the fault.
| 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 |
Common Issues and Solutions:
- Electronic Gear Selector Module Issues: Problems with the electronic gear selector module can lead to shifting and gear selection problems. Diagnostics and potential replacement of the module are essential.
- NOx Trap Efficiency Issues: Fault codes related to NOx trap efficiency indicate problems with the catalytic converter or related sensors. Diagnostics and potential replacement of the affected components are essential.
- Throttle Actuator Problems: Malfunctions in the throttle actuator control motor circuit can cause engine performance issues. Diagnostic checks and possible component replacements are essential.
3.7. B-Level Fault Codes: Body Systems
The B-level fault codes relate to the vehicle’s body systems, including comfort, convenience, and safety features.
| 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 |
