**Mercedes Diesel Engine Codes: Your Expert Guide to Diagnostics**

Mercedes Diesel Engine Codes are essential for pinpointing issues in your vehicle’s sophisticated systems. This guide from CARDIAGTECH.NET provides an in-depth look at these codes, their meanings, and how to address them effectively. By understanding these diagnostic trouble codes (DTCs), you can ensure your Mercedes-Benz remains in peak condition, optimizing its diesel engine performance and promoting longevity. We’ll help you navigate common error messages and recommend the tools you need to resolve them, focusing on areas like exhaust systems, fuel delivery, and more.

1. Understanding Mercedes Diesel Engine Codes

What exactly are Mercedes Diesel Engine Codes, and why are they crucial for maintaining your vehicle?

Mercedes diesel engine codes, or Diagnostic Trouble Codes (DTCs), serve as critical indicators of malfunctions detected by your Mercedes-Benz’s onboard computer. These codes alert you to potential issues, ranging from minor sensor glitches to major mechanical failures, allowing for timely intervention. According to a study by the University of California, Berkeley’s Institute of Transportation Studies, early detection and repair of engine problems can significantly reduce long-term maintenance costs by up to 30%.

This photo shows the OBD-II port inside a Mercedes-Benz, where diagnostic tools connect to read engine fault codes.

These codes use a standardized format, typically beginning with a letter (P, B, C, or U) followed by four digits, each segment providing specific information about the fault.

• P (Powertrain): Relates to the engine, transmission, and associated components.
• B (Body): Indicates issues with body-related systems like airbags, central locking, or climate control.
• C (Chassis): Pertains to chassis systems such as ABS, ESP, or suspension.
• U (Network/Communication): Signifies communication errors between the vehicle’s electronic control units (ECUs).

Decoding these codes requires specialized tools and knowledge, but understanding the basics can empower you to communicate effectively with your mechanic and make informed decisions about your vehicle’s care.

1.1. How Do Mercedes Diesel Engine Codes Work?

How do these diagnostic codes actually work within your Mercedes-Benz?

Mercedes diesel engine codes function through a complex network of sensors and control units that constantly monitor the engine’s performance. When a sensor detects a deviation from the norm, such as irregular emissions levels or misfires, it sends a signal to the engine control unit (ECU). According to a study published in the “SAE International Journal of Engines,” modern ECUs process over 100 million instructions per second to ensure optimal engine operation, demonstrating their critical role in identifying faults.

This image highlights various sensors on a Mercedes-Benz engine, responsible for monitoring performance and triggering fault codes when anomalies are detected.

The ECU then registers the fault and stores a corresponding diagnostic trouble code (DTC) in its memory. This code can be accessed using an OBD-II scanner, which connects to your vehicle’s diagnostic port. The scanner retrieves the DTC, providing a starting point for diagnosing the issue. The process not only helps in identifying the problem but also in preventing potential damage by alerting the driver to seek timely repairs.

1.2. Why Are Mercedes Diesel Engine Codes Important?

Why should you pay attention to Mercedes diesel engine codes?

Mercedes diesel engine codes are vital because they act as early warning signals for potential problems in your vehicle. Ignoring these codes can lead to severe damage and costly repairs. According to research from AAA, drivers who defer maintenance based on warning lights end up paying an average of $1,200 more in repair costs over time. Timely attention to these codes ensures that minor issues are addressed before they escalate into major malfunctions.

The photo features a Mercedes-Benz dashboard with various warning lights illuminated, emphasizing the importance of understanding these signals for timely maintenance.

Moreover, understanding and addressing these codes can improve your vehicle’s fuel efficiency, reduce emissions, and extend its lifespan. For example, a faulty oxygen sensor, indicated by a specific code, can cause the engine to burn more fuel, leading to decreased performance and increased environmental impact.

2. Common Mercedes Diesel Engine Codes and Their Meanings

What are some of the most frequently encountered Mercedes diesel engine codes and what do they signify?

Here are some common Mercedes diesel engine codes and their meanings:

Code	Meaning	Possible Causes
P0400	Exhaust Gas Recirculation (EGR) Flow Malfunction	Faulty EGR valve, blocked EGR passages, malfunctioning EGR pressure sensor
P0101	Mass Air Flow (MAF) Sensor Performance Problem	Dirty or faulty MAF sensor, vacuum leaks, intake air restrictions
P2002	Diesel Particulate Filter (DPF) Efficiency Below Threshold	Clogged DPF, faulty DPF pressure sensor, issues with fuel injectors
P0299	Turbocharger Underboost Condition	Vacuum leaks, faulty turbocharger, malfunctioning boost pressure sensor
P0170	Fuel Trim Malfunction (Bank 1)	Vacuum leaks, faulty oxygen sensor, issues with fuel injectors
P0628	Fuel Pump Control Circuit Low	Faulty fuel pump, wiring issues, malfunctioning fuel pump relay
P261F71	The output for circulation pump has a malfunction. Actuator is blocked.	Coolant intrusion into vacuum system via the water pump.
P126A00	OM642 Engine oil cooler leak – Intake Port Shutoff Actuator is faulty.	Failure of component: intake manifolds, or the intake manifold actuator motor.

2.1. Decoding P0400 Series Fault Codes

What do P0400 series codes specifically indicate in Mercedes diesel engines?

The P0400 series fault codes in Mercedes diesel engines primarily relate to the Exhaust Gas Recirculation (EGR) system. The EGR system is designed to reduce nitrogen oxide (NOx) emissions by recirculating a portion of the exhaust gas back into the engine intake. A malfunction in this system can lead to various issues, including increased emissions and reduced engine performance. According to the EPA, a properly functioning EGR system can reduce NOx emissions by up to 15%, underscoring its importance for environmental compliance.

Here’s a breakdown of common codes within this series:

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

2.1.1. Diagnosing and Resolving P0400 Series Codes

What steps should you take to diagnose and resolve P0400 series codes?

To diagnose and resolve P0400 series codes, follow these steps:

1. Check the EGR Valve: Inspect the EGR valve for carbon buildup, which can prevent it from opening and closing properly. Clean or replace the valve as needed.
2. Inspect Vacuum Lines: Check all vacuum lines connected to the EGR system for leaks or damage. Replace any faulty lines.
3. Test the EGR Pressure Sensor: Use a multimeter to test the EGR pressure sensor. Ensure it provides accurate readings. Replace if necessary.
4. Clear the Code and Retest: After making repairs, clear the fault code using an OBD-II scanner and retest the system to ensure the issue is resolved.

2.2. Understanding P0500 Series Fault Codes

What issues are indicated by the P0500 series fault codes in Mercedes diesel engines?

The P0500 series fault codes in Mercedes diesel engines often relate to vehicle speed sensors, idle control systems, and other critical engine management components. These sensors and systems play a vital role in maintaining optimal engine performance and ensuring smooth operation. According to a technical report by Bosch, accurate speed sensing is crucial for the proper functioning of ABS, ESP, and other safety systems, highlighting the importance of addressing these codes promptly.

Here’s a detailed look at some common codes in this series:

Mercedes Fault Code	Fault Code Meaning
P0500	Vehicle Speed Sensor Malfunction
P0501	Vehicle Speed Sensor Range/Performance
P0502	Vehicle Speed Sensor Low Input
P0503	Vehicle Speed Sensor Intermittent/Erratic/High
P0505	Idle Control System Malfunction
P0506	Idle Control System RPM Lower Than Expected
P0507	Idle Control System RPM Higher Than Expected
P0510	Closed Throttle Position Switch Malfunction
P0520	Engine Oil Pressure Sensor/Switch Circuit Malfunction
P0521	Engine Oil Pressure Sensor/Switch Circuit Range/Performance
P0522	Engine Oil Pressure Sensor/Switch Circuit Low Voltage
P0523	Engine Oil Pressure Sensor/Switch Circuit High Voltage
P0530	A/C Refrigerant Pressure Sensor Circuit Malfunction
P0531	A/C Refrigerant Pressure Sensor Circuit Range/Performance
P0532	A/C Refrigerant Pressure Sensor Circuit Low Input
P0533	A/C Refrigerant Pressure Sensor Circuit High Input
P0534	Air Conditioner Refrigerant Charge Loss
P0550	Power Steering Pressure Sensor Circuit Malfunction
P0551	Power Steering Pressure Sensor Circuit Range/Performance
P0552	Power Steering Pressure Sensor Circuit Low Input
P0553	Power Steering Pressure Sensor Circuit High Input
P0554	Power Steering Pressure Sensor Circuit Intermittent
P0560	System Voltage Malfunction
P0561	System Voltage Unstable
P0562	System Voltage Low
P0563	System Voltage High
P0565	Cruise Control On Signal Malfunction
P0566	Cruise Control Off Signal Malfunction
P0567	Cruise Control Resume Signal Malfunction
P0568	Cruise Control Set Signal Malfunction
P0569	Cruise Control Coast Signal Malfunction
P0570	Cruise Control Accel Signal Malfunction
P0571	Cruise Control/Brake Switch A Circuit Malfunction
P0572	Cruise Control/Brake Switch A Circuit Low
P0573	Cruise Control/Brake Switch A Circuit High
P0574	Cruise Control Related Malfunction
P0575	Cruise Control Related Malfunction
P0576	Cruise Control Related Malfunction
P0578	Cruise Control Related Malfunction
P0579	Cruise Control Related Malfunction
P0580	Cruise Control Related Malfunction

2.2.1. Troubleshooting P0500 Series Codes

What steps should be taken to troubleshoot and fix issues related to P0500 series codes?

To effectively troubleshoot and address P0500 series codes, consider the following steps:

1. Inspect the Vehicle Speed Sensor (VSS): Check the VSS for any physical damage or loose connections. Clean the sensor and ensure it is properly connected.
2. Test the VSS Signal: Use a multimeter or oscilloscope to test the VSS signal while driving. Verify that the signal is consistent and within the specified range.
3. Check the Idle Control Valve (ICV): Inspect the ICV for carbon buildup or damage. Clean or replace the valve as needed.
4. Test the ICV Operation: Use a diagnostic scanner to actuate the ICV and verify that it operates correctly.
5. Check Wiring and Connections: Inspect all wiring and connectors associated with the affected sensors and systems for damage or corrosion.
6. Address System Voltage Issues: If codes related to system voltage are present, check the battery, alternator, and voltage regulator for proper operation.

2.3. Decoding P0600 Series Fault Codes

What do P0600 series codes indicate about the performance and functionality of Mercedes diesel engines?

The P0600 series fault codes in Mercedes diesel engines typically point to issues within the vehicle’s internal control modules and communication systems. These modules are critical for managing various aspects of engine performance, and any disruption can lead to significant operational problems. A study by the German Association of the Automotive Industry (VDA) found that communication errors in control modules can account for up to 40% of electronic system failures in modern vehicles.

Here’s a summary of common codes within this series:

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

2.3.1. Strategies for Resolving P0600 Series Codes

What are the best strategies for resolving issues indicated by the P0600 series codes?

To resolve issues related to P0600 series codes, consider these strategies:

1. Check the Battery Voltage: Ensure the battery voltage is stable and within the specified range. Low voltage can cause communication errors.
2. Inspect Wiring and Connections: Examine all wiring and connectors associated with the control modules for damage or corrosion.
3. Update Control Module Software: Use a diagnostic scanner to check for software updates for the control modules. Outdated software can cause communication issues.
4. Test Communication Links: Use a diagnostic scanner to test the serial communication links between the control modules.
5. Replace Faulty Modules: If a control module is found to be faulty, replace it with a new or refurbished unit.

2.4. Decoding P0700 Series Fault Codes

What transmission-related problems are indicated by the P0700 series codes in Mercedes diesel vehicles?

The P0700 series fault codes in Mercedes diesel vehicles primarily pertain to issues within the transmission control system. These codes can indicate a range of problems, from sensor malfunctions to mechanical failures within the transmission. According to a study by the American Society of Automotive Engineers (SAE), proper transmission maintenance can extend the life of the transmission by up to 50%, emphasizing the importance of addressing these codes promptly.

Here’s an overview of common codes within this series:

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

2.4.1. Best Practices for Addressing P0700 Series Codes

What are the recommended steps for addressing and resolving P0700 series codes in Mercedes diesel vehicles?

Here are the recommended steps for addressing and resolving P0700 series codes:

1. Check Transmission Fluid Level and Condition: Ensure the transmission fluid is at the correct level and in good condition. Low or dirty fluid can cause various transmission problems.
2. Inspect Transmission Sensors: Check the transmission sensors, such as the input speed sensor and output speed sensor, for damage or loose connections.
3. Test Solenoid Operation: Use a diagnostic scanner to test the operation of the transmission solenoids. Faulty solenoids can cause shifting problems.
4. Check Wiring and Connections: Inspect the wiring and connectors associated with the transmission for damage or corrosion.
5. Address Mechanical Issues: If the code indicates a mechanical issue, such as an incorrect gear ratio, consider having the transmission professionally inspected and repaired.

2.5. Decoding P0800 Series Fault Codes

What do P0800 series codes signify in the context of Mercedes diesel engine diagnostics?

The P0800 series fault codes in Mercedes diesel vehicles primarily relate to issues with the transmission’s control system, particularly those involving the clutch, shift solenoids, and related circuits. These codes can indicate a variety of problems, from electrical faults to mechanical failures. According to a study by the National Institute for Automotive Service Excellence (ASE), proper maintenance and timely repairs of transmission components can significantly improve vehicle reliability and performance.

Here’s a detailed look at some common codes in this series:

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

2.5.1. Effective Strategies for Resolving P0800 Series Codes

What strategies are most effective for resolving issues indicated by the P0800 series codes?

To address P0800 series codes effectively, consider these strategies:

1. Inspect Clutch Components: Check the clutch position sensor, switches, and related components for damage or wear.
2. Check Wiring and Connections: Inspect all wiring and connectors associated with the transmission control system for damage or corrosion.
3. Test Solenoid Operation: Use a diagnostic scanner to test the operation of the shift solenoids. Faulty solenoids can cause shifting problems.
4. Check Transmission Fluid: Ensure the transmission fluid is at the correct level and in good condition.
5. Address Mechanical Issues: If the code indicates a mechanical issue, such as clutch slippage, consider having the transmission professionally inspected and repaired.

2.6. Decoding P1000-P2000 Series Fault Codes

What do the P1000-P2000 series fault codes indicate in Mercedes diesel engines?

The P1000-P2000 series fault codes in Mercedes diesel engines cover a wide range of issues, from specific component malfunctions to system performance problems. These codes often require more detailed diagnostics to pinpoint the exact cause. According to a study by the Society of Automotive Engineers (SAE), accurate diagnosis of these codes can significantly reduce repair times and costs.

Here’s a summary of common codes within this series:

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

2.6.1. Diagnostic Approaches for P1000-P2000 Series Codes

What diagnostic approaches are most effective for addressing issues indicated by P1000-P2000 series codes?

To effectively diagnose and address P1000-P2000 series codes, consider these approaches:

1. Use Advanced Diagnostic Tools: Utilize advanced diagnostic scanners that can provide detailed information about the fault, including sensor readings and system parameters.
2. Consult Technical Service Bulletins (TSBs): Check for any TSBs issued by Mercedes-Benz that may provide specific guidance on diagnosing and resolving the code.
3. Inspect Relevant Components: Carefully inspect the components and systems related to the code, such as the throttle actuator, exhaust gas temperature sensor, or NOx trap.
4. Test Wiring and Connections: Check the wiring and connectors associated with the affected components for damage or corrosion.
5. Refer to a Specialist: If the diagnosis is complex or requires specialized knowledge, consult a Mercedes-Benz specialist.

3. Mercedes Body (B####) Fault Codes Explained

What do the Mercedes Body (B####) fault codes mean and how do they impact vehicle systems?

Mercedes Body (B####) fault codes indicate issues within the vehicle’s body-related systems, such as airbags, central locking, climate control, and other convenience features. These codes can affect both safety and comfort, making it important to address them promptly. According to the National Highway Traffic Safety Administration (NHTSA), malfunctioning safety systems can significantly increase the risk of accidents, underscoring the need to address these codes.

Here’s a breakdown of common codes within this series:

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	Ev