Decoding Mercedes Trouble Codes: Your Expert Guide

Mercedes trouble codes can be puzzling, but CARDIAGTECH.NET is here to help you decipher them and get your prized vehicle back on the road. Understanding these codes is the first step towards diagnosing and resolving issues, ensuring your Mercedes performs at its peak with help of professional tools and equipment. With proper diagnostics using professional tools and equipment available at CARDIAGTECH.NET, you’ll be able to pinpoint the issue accurately, leading to effective repairs and preventing further damage with our mercedes diagnostic scanner.

1. Understanding Mercedes-Benz Diagnostic Trouble Codes (DTCs)

A Mercedes-Benz diagnostic trouble code (DTC) is a standardized alphanumeric code that indicates a specific problem detected by the vehicle’s onboard computer system. These codes are crucial for diagnosing issues and ensuring efficient repairs. Here’s a detailed look at what you need to know:

1.1. What are Mercedes Fault Codes?

Mercedes fault codes, also known as Diagnostic Trouble Codes (DTCs), are codes generated by your Mercedes’ onboard computer system when it detects a malfunction. These codes help identify the source of the problem.

Alt: A technician diagnosing Mercedes fault codes using a diagnostic tool, with a focus on the tool’s screen and the Mercedes engine bay.

These codes are standardized, but Mercedes-Benz has its specific definitions and nuances. The codes provide valuable information that helps technicians diagnose issues and perform necessary repairs. When a fault code is triggered, it often activates a warning light on the dashboard, such as the “Check Engine” light.

1.2. Why are Mercedes Error Codes Important?

Mercedes error codes are essential for several reasons:

• Accurate Diagnosis: They help pinpoint the exact problem, reducing guesswork and saving time.
• Prevent Further Damage: Addressing issues early can prevent more significant and costly damage.
• Maintain Performance: Resolving problems ensures your Mercedes operates at its optimal level.
• Safety: Some error codes relate to safety systems, making their prompt resolution critical.

1.3. Reading Mercedes Diagnostic Trouble Codes (DTCs)

Reading DTCs involves using a diagnostic scanner to access the vehicle’s computer system. Here’s a step-by-step guide:

1. Obtain a Diagnostic Scanner: You can purchase a scanner or visit a professional mechanic with the appropriate equipment. CARDIAGTECH.NET can provide you with the best in class and modern Mercedes diagnostic scanner.
2. Locate the OBD-II Port: This port is usually under the dashboard on the driver’s side.
3. Connect the Scanner: Plug the scanner into the OBD-II port.
4. Turn on the Ignition: Turn the key to the “on” position without starting the engine.
5. Follow the Scanner’s Instructions: Navigate the scanner’s menu to read the stored codes.
6. Record the Codes: Write down the codes for further analysis.

For example, a Mercedes diagnostic scanner available from CARDIAGTECH.NET could be the perfect companion for reading and interpreting these codes, offering user-friendly interfaces and comprehensive vehicle coverage.

1.4. Understanding the Structure of a Mercedes Fault Code

Mercedes fault codes typically follow a standard format:

• The first character is a letter indicating the system (e.g., P for powertrain, B for body, C for chassis, and U for network).
• The second character is a number; 0 indicates a generic code, while 1 indicates a manufacturer-specific code.
• The third character is a number indicating the subsystem (e.g., 1 for fuel and air metering).
• The last two characters are specific to the fault.

For example, the code P0300 indicates a generic powertrain code for random/multiple cylinder misfire detected.

1.5. Generic vs. Manufacturer-Specific Codes

Generic codes are standardized across all vehicles and manufacturers. Manufacturer-specific codes, on the other hand, are unique to Mercedes-Benz and provide more detailed information about the issue. While generic scanners can read generic codes, a Mercedes-specific scanner like those from CARDIAGTECH.NET is needed to read manufacturer-specific codes accurately.

1.6. Interpreting Mercedes-Benz Fault Codes

Interpreting Mercedes-Benz fault codes can be complex, but resources are available to help. Online databases, repair manuals, and professional diagnostic tools provide descriptions and possible causes for each code. Always consult multiple sources to ensure an accurate diagnosis.

1.7. Clearing Mercedes Error Codes

After repairing the issue, it’s essential to clear the error codes from the vehicle’s computer. This can be done using a diagnostic scanner. However, be cautious: clearing codes without fixing the problem will only result in the code reappearing.

1.8. Common Mistakes When Diagnosing Mercedes Fault Codes

• Ignoring Symptoms: Don’t rely solely on the code. Consider the symptoms the vehicle is exhibiting.
• Not Verifying the Fix: Ensure the issue is resolved before clearing the code.
• Using a Cheap Scanner: Invest in a quality scanner that can read Mercedes-specific codes.
• Overlooking Related Systems: Sometimes, the code points to a symptom rather than the root cause.

1.9. The Role of Professional Tools in Diagnosing Mercedes Trouble Codes

Professional diagnostic tools from CARDIAGTECH.NET offer advanced features such as live data streaming, component testing, and access to Mercedes-specific repair information. These tools enable technicians to diagnose complex issues accurately and efficiently.

1.10. The Importance of Regular Maintenance to Prevent Mercedes Trouble Codes

Regular maintenance, including oil changes, fluid checks, and inspections, can prevent many common issues that trigger fault codes. Following the manufacturer’s recommended maintenance schedule is crucial for the longevity and performance of your Mercedes-Benz.

By understanding the basics of Mercedes fault codes and utilizing the right tools and resources, you can keep your vehicle running smoothly and address issues promptly. Whether you’re a seasoned mechanic or a Mercedes owner who likes to stay informed, CARDIAGTECH.NET is here to provide the tools and knowledge you need.

2. Common Mercedes Error Messages – Explained

Understanding the common error messages in your Mercedes can help you address issues promptly and prevent further damage. Here are some of the common Mercedes error messages and their explanations:

2.1. Mercedes Fault Code: P261F71

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 water pump gives way and allows coolant (antifreeze) to enter the vacuum system.
Possible Symptoms:	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 is not something for the DIYer. Professional tools such as those from CARDIAGTECH.NET are essential for diagnosing and fixing this issue effectively.

This fault code indicates a malfunction in the circulation pump, often due to coolant intrusion into the vacuum system. It’s a severe issue that requires a master-level technician and professional tools to diagnose and fix effectively.

2.2. 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 (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.
Possible Symptoms:
Parts That Could Need Replacement:
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 suggests a problem with the intake port shutoff actuator, often caused by clogged intake manifolds. It requires expert attention and professional tools to resolve.

2.3. Other Common Mercedes Error Messages

• Check Engine Light: This can indicate a wide range of issues, from a loose gas cap to a more serious engine problem. A diagnostic scan is necessary to determine the exact cause.
• Brake Warning Light: This light could mean low brake fluid, worn brake pads, or a problem with the ABS system. Immediate inspection is recommended.
• Temperature Warning Light: Indicates the engine is overheating. Pull over safely and allow the engine to cool before checking the coolant level.

Understanding these common error messages and their potential causes can help you take prompt action and maintain your Mercedes-Benz in top condition. For professional diagnostics and repair tools, trust CARDIAGTECH.NET to keep you on the road.

3. Comprehensive List of Mercedes Fault Codes and Their Meanings

Here is an extensive compilation of Mercedes fault codes along with their meanings, designed to assist you in understanding and diagnosing issues in your vehicle.

3.1. P0400 Mercedes Fault Codes Meaning

These codes relate to issues with the exhaust gas recirculation (EGR) system, which is responsible for reducing emissions by recirculating a portion of the exhaust gas back into the engine.

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

Alt: A detailed table listing Mercedes P0400 fault codes, including descriptions for purge flow sensor and exhaust pressure sensor issues, emphasizing diagnostic precision.

3.2. P0500 Mercedes Fault Codes Meaning

These codes pertain to vehicle speed sensors, idle control systems, and various pressure sensors, all crucial for engine management and vehicle performance.

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

3.3. P0600 Mercedes Fault Codes Meaning

These codes involve internal control module errors, generator control circuits, and malfunction indicator lamp issues.

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

3.4. P0700 Mercedes Fault Codes Meaning

These codes are related to the transmission control system, torque converter, and shift solenoid issues.

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

3.5. P0800 Mercedes Fault Codes Meaning

These codes are associated with reverse inhibit control, clutch position sensors, and transmission fluid pressure sensors.

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

3.6. P1000-P2000 Fault Codes Meaning

These codes cover a broad spectrum of issues, from electronic gear selector module defects to NOx trap efficiency and throttle actuator control.

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

Alt: A table displaying Mercedes P1000-P2000 fault codes, which include issues ranging from electronic gear selector module problems to NOx trap efficiency and exhaust gas temperature sensor issues.

3.7. Mercedes Body Fault Codes (B-Codes)

These codes relate to various body control functions, including headlamp range adjustment, air conditioning, seat adjustments, and airbag systems.

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/td>
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

3.8. Mercedes Chassis Fault Codes (C-Codes)

These codes pertain to chassis-related systems such as ABS, ASR, ESP, and AIRmatic, which are critical for vehicle stability and control.

Mercedes Fault Code	Fault Code Meaning
C1010	Battery Voltage Low
C1011	ASR/ETS/ESP Circuit Open or Shorted