How to Reset P13E400 Mercedes Adblue Fault Code: “Eng Start not possible in XXX km”

If you own a Mercedes-Benz and encounter the warning message “Eng Start not possible in XXX km (miles)” on your dashboard, or the fault code P13E400 after scanning the error via Xentry, it means the vehicle’s AdBlue system has reached a critical limit. Even after refilling the AdBlue tank, this error may persist, preventing you from starting the engine. This guide will walk you through the necessary steps to resolve this issue effectively.

1. Understanding the Mercedes AdBlue System

The AdBlue system in Mercedes-Benz vehicles is designed to reduce nitrogen oxide (NOx) emissions by converting harmful gases into nitrogen and water before releasing them into the environment. If the AdBlue fluid level runs low, the system will trigger a warning to alert the driver. In extreme cases, when the limit is reached, the vehicle will refuse to start unless the system is reset.

This issue is common in models such as the Mercedes E-Class W212 and other models equipped with the AdBlue system. Even after refilling the AdBlue tank, the “Eng Start not possible in XXX km” warning may remain, requiring further action.

2. Symptoms of the Eng Start Not Possible Mercedes AdBlue Fault

When your Mercedes-Benz encounters an AdBlue system-related problem, particularly one leading to the P13E400 fault code, several telltale signs may become apparent before the ultimate engine start prevention. Recognizing these early symptoms can allow for proactive intervention, potentially avoiding the complete immobilization of your vehicle.

• The Ominous Mileage Countdown: The most direct precursor to the “Eng Start Not Possible Mercedes” warning is a countdown displayed on your dashboard. This counter indicates the remaining distance you can travel before the engine will be automatically prevented from starting. This countdown serves as a final alert to address the AdBlue issue. As the mileage decreases and eventually reaches zero, the engine will refuse to start.

• Restricted Vehicle Performance: In some instances, before the complete engine start prevention is activated, the vehicle’s computer system may impose limitations on its performance. This can manifest as a reduction in engine power or a restriction on the maximum speed the vehicle can attain. These limitations are implemented as interim measures to discourage continued driving with a malfunctioning emissions control system.

• Illuminated Warning Lights: The malfunction indicator lamp (MIL) or check engine light on your dashboard will likely illuminate when an AdBlue system fault is detected. Additionally, a specific AdBlue warning light, often depicted as a urea droplet or a similar symbol, may also be illuminated. These visual cues signal an underlying problem that requires attention.

• Diagnostic Trouble Codes (DTCs): When a diagnostic scan is performed using appropriate automotive diagnostic tools, a range of fault codes related to the AdBlue or SCR system may be revealed. The P13E400 fault code is a primary indicator of a critical AdBlue system issue, often described as “The fill level of the reducing agent tank is too low” or a similar description indicating insufficient DEF. However, other related codes may also be present, providing a more comprehensive picture of the system’s status.

• When scanned with diagnostic software, multiple fault codes may appear, including:
  • P13E400, P13DF00, P13E300, P13E400, P13E500, P13DF09, P2BA9FD
  • 16D300, 16D400, 16D500, 15EA00, 15EB00, 15EC00, 16CE00, 16CF00

To properly diagnose and fix the “Eng Start Not Possible Mercedes” error, specialized software and tools are required.

3. Tools and Software Required 

To reset Mercedes adblue system and clear the error, you need the following equipment:

• Diagnostic Software: Vediamo or DTS Monaco
• Mercedes-Benz Diagnostic Interface: SD Connect C4
• Laptop Requirements:
  • Windows 10 (64-bit)
  • Intel Core i5 or higher
  • At least 4GB RAM (8GB recommended)
  • SSD with at least 10GB free storage
  • Rugged laptop recommended (e.g., Panasonic CF-19, CF-53)

4. How to Reset AdBlue Warning on Mercedes

Step 1: Connect Diagnostic Equipment

1. Plug the SD Connect C4 device into the OBD2 port of the Mercedes-Benz.
2. Connect the C4 device to your laptop using a stable connection.
3. Launch DTS Monaco or Vediamo software.

Step 2: Read Fault Codes

1. Within the diagnostic software (DTS Monaco or Vediamo), navigate to the vehicle selection menu and choose the correct model and year of your Mercedes-Benz.

2. Initiate a scan for error codes across all the vehicle’s electronic control units (ECUs). This process may take a few moments to complete.

3. Once the scan is finished, review the list of fault codes that have been detected.

4. Specifically identify the CR43 Engine Control Module (ECM) in the list of control units. The AdBlue system’s operation is primarily managed by this module.

Step 3: Reset Mercedes AdBlue System

1. Within DTS Monaco, establish a direct connection to the CR43 Engine Control Module (ECM). This typically involves selecting the CR43 module from the list and clicking a “Connect” or similar button within the software interface.

2. Once connected to the CR43 module, navigate through the software menus to locate the AdBlue Warren Szenario Reset function. The exact location of this function may vary slightly depending on the software version, but it is usually found within sections related to adaptations, resets, or special functions pertaining to the exhaust aftertreatment or SCR system.

3. Carefully select the AdBlue Warren Szenario Reset function.

4. Initiate the reset procedure by following the on-screen prompts within the DTS Monaco software. This process may involve confirming your action and allowing the software to communicate with the vehicle to perform the reset. Allow the procedure to complete without interruption.

(Note: If you are using Vediamo, the process will be similar but the navigation to the AdBlue reset function will have a different interface. Consult Vediamo documentation or relevant resources for the specific steps within that software.)

=> Vediamo Manuals: “VGS 1, 2, 3 Coding via Vediamo: Expert Manual for Mercedes-Benz Programming”

=> DTS Monaco Manuals: “DTS Monaco Engineering: A-Z Engineering System Training – Essential Guide for Beginners”

Step 4: Clear Error Codes and Test the Vehicle

1. After the AdBlue reset procedure has been successfully completed, return to the fault code menu within the diagnostic software.

2. Select the option to clear all stored fault codes from the vehicle’s ECUs, including the CR43 module.

3. Once the fault codes have been cleared, disconnect the SD Connect C4 interface from your laptop and then from the vehicle’s OBD2 port.

4. Turn off the vehicle’s ignition and wait for a few minutes (approximately 2-5 minutes). This allows the vehicle’s electronic systems to fully power down and reset.

5. After the waiting period, restart the engine.

6. Observe the dashboard for any warning messages, including the “Eng Start Not Possible Mercedes” warning. If the reset was successful and there are no other underlying issues, the warning should have disappeared, and the engine should start normally.

7. It is advisable to perform another diagnostic scan to confirm that the P13E400 fault code and any other related codes have been successfully cleared and have not returned.

By diligently following these step-by-step instructions, you can effectively reset the AdBlue warning on your Mercedes-Benz and resolve the engine start prevention caused by the P13E400 fault code. However, if the issue persists after performing this procedure, it may indicate a more complex underlying problem within the AdBlue system, such as a faulty sensor (e.g., NOx sensor, AdBlue level sensor), a malfunctioning AdBlue injector, or an issue with the SCR catalytic converter itself. In such cases, further diagnosis and repair by a qualified technician are necessary.

5. How to prevent Adblue System Fault on Mercedes

Preventing AdBlue system faults is always preferable to dealing with the consequences, such as the “Eng Start not possible” warning and the P13E400 fault code. By adopting some proactive maintenance habits, you can significantly reduce the likelihood of encountering these issues with your Mercedes-Benz.

• Timely AdBlue Refills: The most crucial preventive measure is to consistently monitor your vehicle’s AdBlue level and refill the tank well before it reaches the critical warning stage. Pay close attention to the dashboard warnings indicating low AdBlue fluid and replenish it promptly. This simple practice can prevent the system from reaching a state where it triggers the engine start prevention.

• Regular Maintenance and Software Updates: Ensure that your Mercedes-Benz receives regular scheduled maintenance according to the manufacturer’s recommendations. This includes checking the AdBlue system for any potential issues during routine inspections. Furthermore, keeping your vehicle’s software up to date is essential. Software updates often include improvements and fixes for various systems, including the AdBlue system, which can help prevent malfunctions. Consult your dealership or a qualified Mercedes-Benz service center regarding available software updates for your vehicle.

• Address Persistent Errors Promptly: If you encounter any persistent AdBlue-related warning lights or messages on your dashboard, even after refilling the fluid, do not ignore them. These could be early indicators of a developing problem within the system. Have your vehicle diagnosed by a qualified technician to identify and address the underlying cause before it escalates into a more serious issue like the P13E400 fault code and engine start prevention.

• Quality AdBlue Fluid: When refilling the AdBlue tank, always use high-quality AdBlue fluid that meets the ISO 22241 standard. Using substandard or contaminated fluid can negatively impact the performance and longevity of the AdBlue system components, potentially leading to faults.

• Inspect for Leaks: Occasionally inspect around the AdBlue tank and lines for any signs of leaks. AdBlue fluid can crystallize when it dries, leaving behind white or bluish deposits. If you notice any such deposits or a persistent smell of ammonia, it could indicate a leak that needs to be addressed.

• Consider Sensor Health: While not a routine maintenance item, be aware that sensors within the AdBlue system, such as the NOx sensors and the AdBlue level sensor, can eventually fail over time. If the P13E400 error or other related codes reappear frequently despite proper AdBlue levels and resets, it may indicate a faulty sensor that requires replacement.

6. Need Help? Contact AutoExplain for 24/7 Support!

Fixing the “Eng Start Not Possible in XXX km” error requires technical expertise. If you need assistance, contact a professional technician specializing in Mercedes-Benz AdBlue system repairs.

If you’re still facing issues with Mercedes AdBlue fault codes, including P13E400 Mercedes fault codes, our experts at AutoExplain can help you diagnose, code, and program your vehicle online via TeamViewer or UltraViewer. We offer 24/7 remote support to ensure your Mercedes runs smoothly.

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