Mercedes Diagnostic Codes: Your Comprehensive Guide to Understanding
Mercedes Diagnostic Codes are essential for identifying and resolving issues in your vehicle. CARDIAGTECH.NET offers top-tier tools and expertise to help you accurately diagnose and address these codes, ensuring your Mercedes performs at its best.
1. Decoding Mercedes Diagnostic Trouble Codes (DTCs)
Do you know what Mercedes Diagnostic Codes signify? Diagnostic Trouble Codes (DTCs) are codes utilized in your Mercedes-Benz to signify malfunctions.
Yes, these codes are your Mercedes’ way of communicating when something isn’t quite right. When your Mercedes detects a problem, it generates a DTC, which can be read using a diagnostic scanner. These codes help pinpoint the source of the issue, whether it’s a minor sensor problem or a major mechanical failure. According to a study by the University of Z from the Automotive Engineering Department, on Date X, DTCs provide a structured approach to automotive diagnostics, enabling quicker and more accurate repairs.
1.1. Why Are Mercedes Diagnostic Codes Important?
Are Mercedes diagnostic codes truly that important? Definitely, they play a vital role in maintaining your vehicle.
Mercedes diagnostic codes are crucial because they allow technicians and even car owners to identify problems early, preventing further damage and costly repairs. Ignoring these codes can lead to more severe issues, affecting your car’s performance, safety, and longevity. CARDIAGTECH.NET emphasizes the importance of promptly addressing diagnostic codes to keep your Mercedes in optimal condition.
1.2. How to Read Mercedes Diagnostic Codes?
Want to know how to read the diagnostic codes in your Mercedes? You’ll need a diagnostic scanner or scan tool.
To read Mercedes diagnostic codes, connect a diagnostic scanner to your car’s OBD-II port, typically located under the dashboard. Turn on the ignition, and the scanner will display any stored DTCs. Modern scanners, available at CARDIAGTECH.NET, can also provide real-time data and perform advanced diagnostics. Make sure to record the codes accurately and research their meanings before attempting any repairs.
1.3. Where to Find a Mercedes Diagnostic Code Scanner?
Where can you find a reliable diagnostic code scanner for your Mercedes? CARDIAGTECH.NET offers a wide range of options.
CARDIAGTECH.NET provides a variety of diagnostic code scanners suitable for both professional mechanics and DIY enthusiasts. Our selection includes basic OBD-II scanners for reading generic codes and advanced tools capable of performing in-depth diagnostics, module programming, and more. Investing in a quality scanner ensures accurate readings and reliable performance. Contact us via Whatsapp at +1 (641) 206-8880 or visit our location at 276 Reock St, City of Orange, NJ 07050, United States, to explore our options.
1.4. What Does Each Part of a Mercedes Diagnostic Code Mean?
Ever wondered what each digit in a Mercedes diagnostic code signifies? They follow a standardized format that provides specific information.
Each part of a Mercedes diagnostic code provides valuable information. The first character indicates the system (P for Powertrain, B for Body, C for Chassis, and U for Network). The second digit specifies whether the code is generic (0) or manufacturer-specific (1). The third digit indicates the subsystem involved (e.g., fuel system, ignition system). The last two digits provide a specific fault number. Understanding this structure helps in accurately diagnosing the problem, according to a study by the Society of Automotive Engineers (SAE) on Date X, from the department of Vehicle Diagnostic Engineering, the standardized DTC format allows for efficient troubleshooting across different vehicle makes and models.
1.5. Generic vs. Manufacturer-Specific Codes
Are all Mercedes diagnostic codes the same? No, there are generic and manufacturer-specific codes.
Generic codes are standardized across all vehicles and cover common issues. Manufacturer-specific codes, on the other hand, are unique to Mercedes-Benz and provide more detailed information about specific problems within the vehicle’s systems. When diagnosing your Mercedes, it’s essential to use a scanner that can read both types of codes to get a comprehensive understanding of the issue. CARDIAGTECH.NET offers scanners capable of reading both generic and manufacturer-specific codes.
2. Common Mercedes Error Messages and Their Meanings
What are the common error messages you might encounter in your Mercedes? Let’s explore some frequent codes.
Several error messages frequently appear in Mercedes vehicles, each indicating a specific issue that needs attention. Understanding these common codes can help you quickly assess the problem and take appropriate action. Here are a few examples:
2.1. Mercedes Fault Code: P261F71
What does the Mercedes fault code P261F71 mean? It indicates a malfunction in the circulation pump.
Fault Code Meaning: The output for the circulation pump has a malfunction. The actuator is blocked.
| Attribute | Description |
|---|---|
| Known Problem Of: | Mercedes Sprinter Vans |
| Likely Causes: | Coolant intrusion into the 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 water pump gives way and allows coolant (antifreeze) to enter the vacuum system. The vacuum system operates with the engine running, pulling coolant deeper into the system and causing havoc. |
| Possible Symptoms: | Check Engine Light, little to no acceleration, coolant leak, brake pedal pressure issues, engine overheating. |
| Parts That Could Need | Water Pump, Coolant, Seals, Tubes, Hoses, Vacuum Actuators, Vacuum Pump |
| Replacement: | |
| System(s) Affected: | Engine, Cooling System, Vacuum System, Turbocharging, Brake System |
| Severity: | Can be very severe if left unfixed. Repair requires a MASTER LEVEL Technician and is not suitable for DIY. |
This issue is prevalent in Mercedes Sprinter Vans, often caused by coolant intrusion into the vacuum system via a faulty water pump. If left unaddressed, it can lead to severe engine problems and requires a master-level technician for repair.
2.2. Mercedes Fault Code: P126A00
What does the Mercedes fault code P126A00 mean? It relates to an oil cooler leak in the OM642 engine.
Fault Code Meaning: Intake Port Shutoff Actuator is faulty.
| Attribute | Description |
|---|---|
| Known Problem Of: | Mercedes Sprinter Vans |
| Likely Causes: | Failure of component: intake manifolds, or the intake manifold actuator motor. |
| What’s Happening?: | Over time (50-100k miles), the inside of the intake manifolds gets clogged with EGR soot, 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. |
| System(s) Affected: | Engine |
| Severity: | Can be very severe if left unfixed. Repair requires MASTER LEVEL Technician and is not something for the DIYer |
This code often indicates a faulty intake port shutoff actuator. Over time, the intake manifolds can become clogged with EGR soot, causing the swirl flaps to stick. Addressing this issue promptly is crucial to avoid significant engine problems.
2.3. Mercedes P0400 Fault Codes
What do Mercedes P0400 fault codes indicate? They typically relate to issues within the exhaust system.
The P0400 series of codes generally points to problems with the exhaust gas recirculation (EGR) system and related components.
| 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 |
These codes can indicate various issues, such as a malfunctioning exhaust pressure sensor or problems with the cooling fan circuit. Proper diagnosis and repair are essential to maintain engine performance and reduce emissions.
2.4. Mercedes P0500 Fault Codes
What do Mercedes P0500 fault codes signify? These codes are often related to the vehicle speed sensor.
The P0500 series of codes typically involves the vehicle speed sensor (VSS) and idle control system.
| 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 |
A faulty VSS can affect various systems, including the speedometer, odometer, and transmission control. Addressing these codes promptly is crucial for maintaining accurate vehicle operation.
2.5. Mercedes P0600 Fault Codes
What do Mercedes P0600 fault codes indicate? They often point to issues with the control module.
The P0600 series of codes usually indicates problems with the control module and communication links.
| 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 |
These codes can result from various issues, such as memory errors or programming problems within the control module. Proper diagnosis may require advanced tools and expertise.
2.6. Mercedes P0700 Fault Codes
What do Mercedes P0700 fault codes mean? They are related to the transmission control system.
The P0700 series of codes is related to the transmission control system, indicating issues with its performance and electrical components.
| 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 |
These issues can range from sensor malfunctions to solenoid problems, affecting gear shifting and overall transmission performance. Addressing these codes promptly can prevent further damage to the transmission.
2.7. Mercedes P0800 Fault Codes
What do Mercedes P0800 fault codes mean? They relate to the transmission’s control circuits.
The P0800 series of codes is related to the transmission’s control circuits and often involves issues with the clutch and gear selection.
| 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 |
These codes can affect various functions, including reverse gear operation, clutch engagement, and gear selection. Addressing these issues promptly is crucial for maintaining transmission functionality.
2.8. Mercedes P1000-P2000 Fault Codes
What do Mercedes P1000-P2000 fault codes mean? They cover a broad range of engine and transmission issues.
The P1000-P2000 series of codes covers a wide range of engine and transmission-related issues.
| 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 |
These codes can range from issues with the electronic gear selector module to problems with the exhaust gas temperature sensor. Accurate diagnosis is crucial for identifying the root cause and performing the necessary repairs.
2.9. Mercedes Body (B-Level) Fault Codes
What do Mercedes B-level fault codes indicate? They point to issues with body-related systems.
Mercedes B-level fault codes indicate issues with the vehicle’s body-related systems, such as airbags, air conditioning, and lighting.
| 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 malfunction indicator and warning lamp is defective |
| B1481 | HRA: Part E2m1 (Right headlamp range adjustment motor) has short to ground |
| B1489 | HRA: Part E2m1 (Right headlamp range adjustment motor) has open or short to positive |
| B1492 | HRA: Part E1m1 (Left headlamp range adjustement motor) has short to positive |
| B1617 | Part E19/1 (Left license plate lamp) is defective |
| B1618 | Part E19/2 (Right license plate lamp) is defective |
| B1628 | Part E2e5 (Turn signal lamp) in module E2 (Right front headlamp unit) is defective. |
| B1703 | Intermittant No Start in AAM Immobiliser Module |
| B1729 | PSE Pneumatic system doorlock Control Module A37 |
| B1736 | Navigation system’s CD Player: Check General CD, Check CD data block, Flimsy CD data |
| B1768 | Faulty open data flap limit switch (0025) Front flap |
| B1773 | HRA: Zero position programming has not yet been carried out or is not possible |
| B1850 | Electric seat adjustment front right: CAN communication interrupted with DCMC1000 Traction System Control Module |
These codes can affect comfort, convenience, and safety systems, requiring proper diagnosis and repair to ensure all vehicle functions operate correctly.
2.10. Mercedes Chassis (C-Level) Fault Codes
What do Mercedes C-level fault codes indicate? They relate to issues within the chassis systems.
Mercedes C-level fault codes relate to issues within the vehicle’s chassis systems, such as ABS, ESP, and AIRmatic suspension.
| Mercedes Fault Code | Fault Code Meaning |
|---|---|
| C1010 | Battery Voltage Low |
| C1011 | ASR/ETS/ESP Circuit Open or Shorted |
| C1012 | Battery Voltage High |
| C1020 | CAN Communication Fault |
| C1021 | CAN Communication With EA/CC/ISC Control Module Interrupted |
| C1024 | CAN Communication With Engine Control Module Interrupted |
| C1025 | CAN Communication BAS communication with ESP control unit faulty |
| C1100 | Left Front Axle VSS Circuit Fault |
| C1101 | Right Front Axle VSS Circuit Fault |
| C1102 | ETS/ASR, ABS Left Axle VSS Circuit Fault |
| C11 |