Mercedes Benz Trouble Codes: Your Comprehensive Guide
Mercedes Benz Trouble Codes can be a headache, but understanding them doesn’t have to be. This comprehensive guide from CARDIAGTECH.NET breaks down common Mercedes diagnostic trouble codes (DTCs), helping you diagnose issues and keep your luxury vehicle running smoothly. We provide you with the knowledge and tools to keep your Mercedes performing at its best, and assist you in maintaining your vehicle’s health. Let CARDIAGTECH.NET assist you in finding the diagnostic solutions you need to tackle those perplexing engine codes.
1. Understanding Mercedes Benz Trouble Codes
1.1 What are Mercedes Benz Trouble Codes (DTCs)?
Mercedes Benz Trouble Codes, also known as Diagnostic Trouble Codes (DTCs), are alphanumeric codes used to identify potential problems within a vehicle’s systems. These codes are generated by the vehicle’s onboard computer when it detects a malfunction or deviation from normal operating parameters. According to a 2022 report by the National Institute for Automotive Service Excellence (ASE), DTCs cover a wide range of issues, from minor sensor malfunctions to major engine or transmission failures.
1.2 How Do Mercedes Onboard Computers Detect Problems?
Mercedes-Benz vehicles are equipped with sophisticated onboard computers that continuously monitor hundreds of individual systems, sensors, and variables. These systems include the engine, transmission, braking system, emissions controls, and various electronic components. The onboard computer uses data from these sensors to optimize performance, shifting, braking, traction, stability, and safety. When a sensor detects a reading outside of the acceptable range, the computer registers the error and generates a fault code. This triggers a warning light on the dashboard, such as the “Check Engine,” “Brake,” or “Temperature” light, alerting the driver to a potential issue, as highlighted by a study from the Bosch Automotive Handbook in 2020.
1.3 Why is it Important to Address Mercedes Fault Codes Promptly?
Addressing Mercedes fault codes promptly is vital for maintaining your vehicle’s performance, safety, and longevity. Ignoring warning lights and DTCs can lead to more severe and costly repairs down the road. A study by AAA in 2021 found that neglecting routine maintenance and minor repairs can result in a tenfold increase in repair costs over time. For instance, a faulty sensor might initially cause a minor performance issue, but if left unaddressed, it could lead to damage to other components, such as the catalytic converter or engine.
1.4 What are the Potential Consequences of Ignoring Error Codes?
Ignoring error codes in your Mercedes-Benz can lead to several adverse consequences:
- Reduced Performance: Engine misfires, poor acceleration, and decreased fuel efficiency.
- Increased Emissions: Malfunctioning emissions control systems can cause your vehicle to fail emissions tests.
- Safety Risks: Problems with the braking system or stability control can compromise your safety and the safety of others.
- Costly Repairs: Minor issues can escalate into major mechanical failures, resulting in expensive repairs.
- Vehicle Damage: Continued operation with unresolved issues can cause additional wear and tear on other components, leading to further damage.
1.5 How Can CARDIAGTECH.NET Help You Address Mercedes Benz Trouble Codes?
CARDIAGTECH.NET offers a range of diagnostic tools and equipment to help you accurately identify and address Mercedes Benz trouble codes. Our selection includes:
- OBD-II Scanners: These handheld devices connect to your vehicle’s OBD-II port and retrieve diagnostic trouble codes.
- Professional Diagnostic Tools: Advanced diagnostic systems for comprehensive analysis and troubleshooting.
- Software and Updates: Access to the latest software and updates to ensure accurate and reliable diagnostics.
By providing high-quality diagnostic tools and equipment, CARDIAGTECH.NET empowers technicians to quickly and effectively resolve issues, ensuring optimal performance and customer satisfaction. Contact us via WhatsApp at +1 (641) 206-8880 for expert guidance.
2. Decoding Common Mercedes Benz Trouble Codes
2.1 Understanding the Structure of a DTC
A Diagnostic Trouble Code (DTC) typically consists of five characters: one letter followed by four numbers. Each character provides specific information about the nature and location of the problem. According to the Society of Automotive Engineers (SAE), the first character indicates the system affected:
- P (Powertrain): Relates to the engine, transmission, and associated components.
- B (Body): Concerns body-related systems such as airbags, central locking, and electric windows.
- C (Chassis): Involves chassis systems like ABS, traction control, and suspension.
- U (Network): Indicates issues with the vehicle’s communication network.
The second character specifies whether the code is generic (0) or manufacturer-specific (1). The third character identifies the subsystem, such as fuel and air metering, ignition system, or auxiliary emissions controls. The last two characters pinpoint the specific fault within that subsystem.
2.2 Common Mercedes Error Messages Explained
Several common Mercedes error messages can appear on your dashboard, each indicating a specific issue with your vehicle. Understanding these messages can help you take appropriate action and prevent further damage. Let’s delve into some of these common error messages:
- Check Engine Light: This is one of the most common warning lights and can indicate a wide range of issues, from a loose gas cap to a faulty oxygen sensor. It is essential to have the code read to determine the exact cause.
- Brake Light: This light can indicate several issues, including low brake fluid, worn brake pads, or a problem with the ABS system.
- ABS Light: This light indicates a problem with the Anti-lock Braking System (ABS). The brakes will still work, but the ABS function may be disabled.
- SRS Light: This light indicates a problem with the Supplemental Restraint System (SRS), which includes airbags and seatbelt pretensioners.
- Battery Light: This light indicates a problem with the charging system, such as a faulty alternator or a weak battery.
- Temperature Light: This light indicates that the engine is overheating, which can cause severe damage if not addressed immediately.
By understanding these common error messages, you can take the necessary steps to diagnose and resolve the underlying issues, ensuring the safety and reliability of your Mercedes-Benz.
2.3 Detailed Breakdown of Specific Mercedes Fault Codes
Let’s explore some specific Mercedes fault codes to provide a deeper understanding of potential issues and their implications.
2.3.1 Mercedes Fault Code: P261F71
| Fault Code Meaning: | The output for the circulation pump has a malfunction. The actuator is blocked. |
|---|---|
| Known Problem Of: | Mercedes Sprinter Vans |
| Likely Causes: | Coolant intrusion into the vacuum system via the water pump. |
| What’s Happening?: | On the OM651 4-cylinder diesel engine, the coolant water pump is vacuum actuated. The internal seal in the water pump fails, allowing coolant (antifreeze) to enter the vacuum system. The vacuum system operates when the engine is running. As the vehicle is driven, the vacuum pulls coolant deeper into the system, causing havoc. |
| Possible Symptoms: | Check Engine Light, Little to no acceleration, Coolant leak, Brake Pedal Pressure, Engine overheating |
| Parts to Replace: | 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. |
2.3.2 Mercedes Fault Code: 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 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. This binding affects the motor, leading to the check engine light and a severe loss of acceleration. |
| Possible Symptoms: | Loss of acceleration, Check Engine Light |
| Parts to Replace: | Intake manifolds, Intake manifold actuator motor |
| System(s) Affected: | Engine |
| Severity: | Very severe if left unfixed; requires a master-level technician. |
2.4 Common Mercedes P0400 Fault Codes
The P0400 range of fault codes typically relates to issues with 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. Here are some common P0400 codes and their meanings:
| 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 |
2.5 Common Mercedes P0500 Fault Codes
The P0500 range of fault codes typically relates to issues with vehicle speed sensors, idle control systems, and other engine-related sensors. Here’s a detailed look at some common P0500 codes:
| 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 |
2.6 Common Mercedes P0600 Fault Codes
The P0600 range of fault codes typically relates to issues with the vehicle’s control modules and communication links. These codes can indicate problems with internal control module memory, programming errors, or communication malfunctions. Below are explanations of common P0600 codes:
| 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 |
2.7 Common Mercedes P0700 Fault Codes
The P0700 range of fault codes typically relates to issues within the transmission control system. These codes can indicate problems with the transmission control module (TCM), sensors, solenoids, and other components affecting transmission performance.
| 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 |
2.8 Common Mercedes P0800 Fault Codes
The P0800 range of fault codes typically relates to issues with transmission-related control circuits and switches. These codes can indicate problems with reverse inhibit control, upshift solenoids, clutch position sensors, and other components affecting transmission functionality.
| 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 |
2.9 Common Mercedes P1000-P2000 Fault Codes
The P1000-P2000 range of fault codes in Mercedes vehicles covers a wide variety of issues, often related to specific systems or components. These codes can be manufacturer-specific and may require detailed knowledge of Mercedes-Benz systems to diagnose and resolve.
| 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 |
2.10 Mercedes Body (B-Level) Fault Codes
Mercedes Body (B-Level) fault codes relate to issues with various systems within the vehicle’s body, such as lighting, climate control, seat adjustments, and airbag systems. These codes can help diagnose problems with 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 |
| 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 |
2.11 Mercedes Chassis (C-Level) Fault Codes
Mercedes Chassis (C-Level) fault codes pertain to issues with the vehicle’s chassis systems, including the Anti-lock Braking System (ABS), Electronic Stability Program (ESP), and suspension systems. These codes can help diagnose problems related to vehicle handling, stability, and braking performance.
| 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 |