VCDS Error 31: Request Out of Range - Troubleshooting Guide

VCDS Error 31, specifically “Request Out of Range,” can be a frustrating issue when coding or adapting control modules, especially the ABS module. CARDIAGTECH.NET provides the solutions. This guide provides a detailed exploration of this error, its causes, and effective troubleshooting steps to help you resolve it efficiently using the VCDS diagnostic tool. We’ll discuss coding issues, module compatibility, and essential steps to ensure a smooth repair process.

1. Understanding VCDS Error 31: Request Out of Range

VCDS (VAG-COM Diagnostic System) is a powerful tool used for diagnosing and programming Volkswagen, Audi, Skoda, and SEAT vehicles. When performing coding or adaptation procedures, you might encounter Error 31, which signifies that the requested coding value or adaptation parameter falls outside the permissible range defined by the control module. This can occur due to various reasons, including incorrect coding values, module incompatibility, or software glitches. Understanding the root cause is crucial for effective troubleshooting.

This image illustrates the VCDS diagnostic tool interface, a vital tool for automotive diagnostics and coding.

1.1 Common Scenarios Leading to Error 31

Several scenarios can trigger VCDS Error 31. Let’s explore the most common ones:

Incorrect Coding Values: Entering a coding value that is not supported by the control module’s software or hardware.
Module Incompatibility: Using a replacement module that is not fully compatible with the vehicle’s configuration or software version.
Software Glitches: Occasional software bugs or glitches within the VCDS software or the vehicle’s control module.
Damaged or Faulty Module: In rare cases, the control module itself may be defective, leading to incorrect responses during coding.

1.2 Identifying the Affected Module

The error message typically specifies which control module is throwing the error. In the case of the initial problem, it was the ABS (Anti-lock Braking System) module. Identifying the specific module is essential because troubleshooting steps will vary depending on the module involved. For instance, ABS modules often have complex coding requirements related to vehicle-specific parameters like wheel size, brake types, and electronic stability programs.

2. Preliminary Checks and Preparations

Before diving into advanced troubleshooting, it’s essential to perform some preliminary checks and preparations. These steps can help rule out simple causes and ensure a smooth troubleshooting process.

2.1 Verifying VCDS Software and Hardware

Ensure that you’re using the latest version of the VCDS software and that your diagnostic interface is functioning correctly. Older versions of the software may have bugs or compatibility issues that can trigger Error 31.

Update VCDS Software: Download and install the latest version of VCDS from the official Ross-Tech website.
Check Interface Connection: Ensure that the VCDS interface is properly connected to your computer and the vehicle’s OBD-II port.
Test Interface: Use the VCDS software to test the interface connection and confirm that it can communicate with the vehicle’s control modules.

2.2 Checking Battery Voltage and Connections

Low battery voltage or poor electrical connections can sometimes interfere with the coding process and trigger Error 31.

Battery Voltage: Verify that the vehicle’s battery voltage is within the acceptable range (typically 12.5V or higher).
Clean Connections: Inspect and clean the battery terminals and ground connections to ensure good electrical conductivity.
Load Test: Perform a load test on the battery to check its ability to maintain voltage under load.

2.3 Retrieving and Documenting Original Coding

Before attempting any coding changes, it’s crucial to retrieve and document the original coding of the control module. This provides a fallback option if the new coding doesn’t work or causes unexpected issues.

Access Control Module: Use VCDS to access the control module that you intend to code.
Read Coding: Read the current coding value and record it carefully, either by writing it down or taking a screenshot.
Save Scan Log: Save a complete scan log of the vehicle, including all control module data. This can be useful for future reference and troubleshooting.

3. Diagnosing the “Request Out of Range” Error

Once you’ve completed the preliminary checks, it’s time to dive into diagnosing the root cause of the “Request Out of Range” error. This involves analyzing the error message, examining the coding values, and considering potential compatibility issues.

3.1 Interpreting the Error Message

The VCDS error message usually provides valuable information about the nature of the problem. Pay close attention to the following details:

Module Address: The address of the control module that is throwing the error (e.g., Address 03: ABS Brakes).
Error Code: The specific error code associated with the “Request Out of Range” error (e.g., Error 31).
Coding Value: The coding value that was rejected by the control module.
Description: Any additional information or context provided in the error message description.

3.2 Analyzing Coding Values

Carefully examine the coding values that you are trying to enter into the control module. Compare them to the original coding values, if available, and consider the following factors:

Value Range: Ensure that the coding values are within the acceptable range for the control module. Refer to the VCDS documentation or online resources for information about valid coding ranges.
Bit Assignments: Understand the meaning of each bit or digit in the coding value. Incorrect bit assignments can lead to errors.
Vehicle Configuration: Verify that the coding values are appropriate for the vehicle’s specific configuration, including model year, engine type, and optional equipment.

3.3 Checking Module Compatibility

If you’re using a replacement control module, compatibility issues can be a common cause of Error 31. Consider the following:

Part Number: Ensure that the part number of the replacement module matches the original module. Even slight variations in part numbers can indicate incompatibility.
Hardware and Software Versions: Check the hardware and software versions of the replacement module and compare them to the original module. Incompatibilities in these versions can cause coding errors.
Adaptation Channels: Some control modules require adaptation to the vehicle’s specific configuration. Use VCDS to check and adjust the adaptation channels as needed.

This image displays a selection of automotive parts, emphasizing the importance of using compatible components during repairs.

3.4 Reviewing Scan Logs

A complete scan log of the vehicle can provide valuable clues about the cause of Error 31. Look for the following:

Related Fault Codes: Check for other fault codes that may be related to the ABS module or other systems. These codes can provide insights into underlying issues that are interfering with the coding process.
Communication Errors: Look for communication errors between the ABS module and other control modules. Communication problems can sometimes prevent the module from accepting new coding values.
Module Status: Check the status of the ABS module in the scan log. If the module is showing unusual behavior or errors, it may indicate a hardware or software problem.

4. Step-by-Step Troubleshooting Guide

Based on the diagnostic findings, you can now proceed with targeted troubleshooting steps to resolve the “Request Out of Range” error.

4.1 Recoding the ABS Module

The primary goal here is to recode the ABS module with the correct coding that matches the vehicle’s specifications.

4.1.1 Using the Correct Coding

Identify Correct Coding: Using the original scan log, identify the correct coding for the ABS module. In this case, the original coding was 114B400C49230000881202E9921C0042310000.
Enter Coding in VCDS: Open VCDS, navigate to the ABS module, and enter the original coding.

4.1.2 Addressing “Coding Rejected” Errors

Check Security Access: Some modules require security access before coding can be changed. Check if the ABS module requires a security code and enter it before attempting to recode.
Verify Compatibility: Ensure the replacement module is fully compatible with the vehicle. Mismatched modules will reject coding.
Check for Updates: Ensure that your VCDS software is up to date to support the ABS module’s coding protocols.

4.1.3 Step-by-Step Instructions

Connect VCDS: Connect the VCDS interface to the vehicle’s OBD-II port and turn on the ignition.
Select Control Module: Open the VCDS software and select the ABS Brakes module (Address 03).
Enter Security Access Code: If required, enter the security access code for the ABS module. This code can usually be found in the VCDS documentation or online resources.
Select Coding: Choose the “Coding – 07” function.
Enter New Coding Value: Enter the correct coding value for the ABS module.
Test Drive: After coding, perform a test drive to ensure that the ABS system is functioning properly.

4.2 Addressing Module Incompatibility

When dealing with a replacement ABS module, ensuring compatibility is crucial.

4.2.1 Verifying Part Numbers

Confirm Part Number: Ensure that the replacement ABS module has the exact same part number as the original module. Even a slight difference can cause issues.

4.2.2 Checking Hardware and Software Versions

Compare Versions: Use VCDS to check the hardware and software versions of both the original and replacement modules. They should be identical or at least compatible.

4.2.3 Adaptation Channels

Access Adaptation: In VCDS, access the adaptation channels for the ABS module.
Adjust Settings: Compare the adaptation settings of the original module with those of the replacement module. Adjust the settings of the replacement module as needed to match the original.

4.2.4 Step-by-Step Instructions

Connect VCDS: Connect the VCDS interface to the vehicle’s OBD-II port and turn on the ignition.
Select Control Module: Open the VCDS software and select the ABS Brakes module (Address 03).
Read Adaptation Channels: Choose the “Adaptation – 10” function.
Compare and Adjust: Compare the adaptation values to the original module and adjust accordingly.
Test Drive: After adaptation, perform a test drive to ensure that the ABS system is functioning properly.

4.3 Resolving Communication Issues

Communication problems between the ABS module and other control modules can prevent successful coding.

4.3.1 Checking CAN Bus Connections

Inspect Wiring: Check the CAN bus wiring for any signs of damage, corrosion, or loose connections.
Test Continuity: Use a multimeter to test the continuity of the CAN bus wires between the ABS module and other control modules.

4.3.2 Clearing Fault Codes

Clear Codes: Use VCDS to clear all fault codes in the ABS module and other related modules.
Retest: After clearing the codes, retest the coding process to see if the communication issues have been resolved.

4.3.3 Step-by-Step Instructions

Connect VCDS: Connect the VCDS interface to the vehicle’s OBD-II port and turn on the ignition.
Select Control Module: Open the VCDS software and select the ABS Brakes module (Address 03).
Clear Fault Codes: Choose the “Fault Codes – 02” function and clear all stored fault codes.
Test Coding: Attempt the coding process again to see if the issue is resolved.

4.4 Addressing Software Glitches

In some cases, the “Request Out of Range” error may be caused by a software glitch in the VCDS software or the vehicle’s control module.

4.4.1 Restarting VCDS

Restart Software: Close the VCDS software and restart it. This can sometimes resolve temporary software glitches.

4.4.2 Reinstalling VCDS

Reinstall Software: If restarting the software doesn’t help, try uninstalling and reinstalling the VCDS software.

4.4.3 Checking for Firmware Updates

Update Firmware: Ensure that the firmware of your VCDS interface is up to date. Firmware updates can sometimes resolve compatibility issues.

4.4.4 Step-by-Step Instructions

Close VCDS: Close the VCDS software.
Restart Computer: Restart your computer.
Reinstall VCDS: If necessary, uninstall and reinstall the latest version of VCDS.
Test Again: Attempt the coding process again to see if the issue is resolved.

5. Advanced Troubleshooting Techniques

If the basic troubleshooting steps don’t resolve the “Request Out of Range” error, you may need to employ some advanced techniques.

5.1 Using VCDS Log Files

VCDS generates log files that can provide detailed information about the coding process and any errors that occur.

Locate Log Files: Locate the VCDS log files on your computer. They are typically stored in the VCDS installation directory.
Analyze Log Data: Open the log files and analyze the data for any clues about the cause of the error. Look for error messages, communication problems, or unusual activity.

5.2 Comparing Coding Maps

Coding maps provide detailed information about the valid coding options for a specific control module.

Obtain Coding Maps: Obtain coding maps for the ABS module from online resources or VCDS documentation.
Compare Coding Values: Compare the coding values that you are trying to enter with the coding map to ensure that they are valid.

5.3 Seeking Expert Assistance

If you’ve exhausted all troubleshooting options and are still unable to resolve the “Request Out of Range” error, it may be time to seek assistance from a VCDS expert or a qualified automotive technician.

VCDS Forums: Post your problem on VCDS forums and seek advice from experienced users.
Professional Technicians: Consult with a professional automotive technician who has experience with VCDS coding and ABS systems.

This image illustrates an automotive technician working on a vehicle, emphasizing the value of professional expertise in resolving complex issues.

6. Preventing Future Errors

Once you’ve resolved the “Request Out of Range” error, it’s important to take steps to prevent similar issues from occurring in the future.

6.1 Regular Software and Hardware Updates

Keep your VCDS software and hardware up to date to ensure compatibility and bug fixes.

Software Updates: Regularly check for and install VCDS software updates.
Firmware Updates: Keep the firmware of your VCDS interface up to date.

6.2 Proper Documentation

Document all coding changes and adaptations that you perform on vehicles.

Save Scan Logs: Save a complete scan log of the vehicle before and after making any coding changes.
Record Coding Values: Record the original and new coding values in a secure location.

6.3 Double-Checking Coding Values

Always double-check coding values before entering them into the control module.

Verify Values: Verify that the coding values are correct for the vehicle’s specific configuration.
Consult Resources: Consult VCDS documentation or online resources to ensure that the coding values are valid.

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8. Case Studies and Examples

To further illustrate the troubleshooting steps and solutions, let’s look at some case studies and examples.

8.1 Case Study 1: Incorrect Coding After ABS Module Replacement

Problem: A technician replaced an ABS module in a 2012 VW Golf and encountered VCDS Error 31 when attempting to code the new module.

Diagnosis: The technician verified that the replacement module had the correct part number but discovered that the coding value being used was incorrect.

Solution: The technician retrieved the original coding value from the vehicle’s scan log and used it to recode the ABS module. The error was resolved, and the ABS system functioned properly.

8.2 Case Study 2: Incompatible ABS Module

Problem: A DIY mechanic installed a used ABS module in a 2010 Audi A4 and encountered VCDS Error 31.

Diagnosis: The mechanic checked the part number and found that it was slightly different from the original module. Further investigation revealed that the hardware and software versions were also incompatible.

Solution: The mechanic obtained a replacement ABS module with the correct part number, hardware version, and software version. After installing the compatible module and coding it with the correct value, the error was resolved.

8.3 Case Study 3: Communication Error

Problem: A technician was unable to code an ABS module in a 2015 Skoda Octavia and encountered VCDS Error 31.

Diagnosis: The technician checked the CAN bus connections and found a loose wire. After securing the wire, the technician was able to successfully code the ABS module.

9. FAQ: Addressing Your VCDS Error 31 Questions

Here are some frequently asked questions about VCDS Error 31:

What does VCDS Error 31 “Request Out of Range” mean?

It indicates that the coding value or adaptation parameter you’re trying to enter is outside the permissible range for the control module.
How can I identify the correct coding value for my ABS module?

Check the vehicle’s original scan log or consult VCDS documentation.
What should I do if my replacement ABS module is incompatible?

Ensure the replacement module has the exact same part number, hardware version, and software version as the original.
Can low battery voltage cause VCDS Error 31?

Yes, low battery voltage or poor electrical connections can interfere with the coding process.
What are the steps to clear fault codes in the ABS module?

Connect VCDS, select the ABS module, choose “Fault Codes – 02,” and clear all stored codes.
How do I check the CAN bus connections?

Inspect the CAN bus wiring for damage, corrosion, or loose connections, and test the continuity of the wires with a multimeter.
What should I do if the coding process is interrupted?

Ensure stable power, check the connection, and restart the coding process from the beginning.
How can I update my VCDS software and hardware?

Regularly check for updates on the Ross-Tech website and follow the provided instructions.
Where can I find coding maps for my ABS module?

Coding maps can be found in VCDS documentation, online forums, or through professional resources.
When should I seek professional assistance for VCDS Error 31?

If you’ve tried all troubleshooting steps and are still unable to resolve the error, it’s best to consult a VCDS expert or a qualified automotive technician.

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