Audi DTC 01794:035 – How Can I Fix a VIN Mismatch?

Audi Dtc 01794:035 indicates a control module VIN mismatch. This article provides a comprehensive guide to diagnosing and resolving this issue, ensuring your Audi’s systems function correctly and offering a seamless solution through AutoExplain.com’s expert remote support and diagnostic services, including ECU coding and module adaptation.

1. What Does Audi DTC 01794:035 Really Mean?

Audi DTC 01794:035, often encountered during module replacements or upgrades, signifies a Control Module – Incorrect Chassis (VIN) Number. It means the Vehicle Identification Number (VIN) stored in the control module doesn’t match the VIN of the car. This discrepancy can lead to various functional issues and trigger warning lights on the dashboard, which may require the assistance of AutoExplain.com.

• The code indicates a mismatch between the VIN stored in a specific control module and the vehicle’s actual VIN.
• It commonly occurs after replacing a control module or performing an upgrade.
• The issue can affect various systems, including the steering, ABS, and engine control units.

2. What are the Common Causes of the 01794:035 Error Code?

The 01794:035 error code in Audi vehicles arises from several key causes, including control module replacement, ECU software update errors, and incorrect VIN coding during installation, often requiring the expertise of AutoExplain.com.

• Control Module Replacement: When a new or used control module is installed, it may not have the correct VIN programmed into it.
• ECU Software Updates: Occasionally, software updates can corrupt the VIN stored in the control module.
• Incorrect VIN Coding: During the installation or coding of a new module, an incorrect VIN might be entered.

3. What Are the Symptoms of Audi DTC 01794:035?

The symptoms of Audi DTC 01794:035 range from warning lights and system malfunctions to communication errors, and module incompatibility, highlighting the need for professional diagnostics and VIN correction services from AutoExplain.com.

• Warning Lights: The ABS, ESP, or other system warning lights may illuminate on the dashboard.
• System Malfunctions: Certain vehicle systems, like cruise control or steering assist, might not function correctly.
• Communication Errors: Diagnostic tools may report communication errors with the affected control module.
• Module Incompatibility: The vehicle may exhibit general issues due to the replaced module’s incorrect configuration.

4. How to Diagnose Audi DTC 01794:035?

Diagnosing Audi DTC 01794:035 involves thorough scanning, VIN verification, module-specific checks, and component testing to pinpoint the VIN mismatch, often best addressed with AutoExplain.com’s remote diagnostic support and troubleshooting.

1. Scan the Vehicle: Use a diagnostic tool like VCDS to confirm the presence of the 01794:035 code and any other related fault codes.
2. Verify the VIN: Check the VIN stored in the control module against the vehicle’s actual VIN. This can usually be done through the diagnostic tool.
3. Module-Specific Checks: Depending on the affected module (steering, ABS, etc.), perform specific checks and tests as outlined in the repair manual.
4. Component Testing: Test related components and wiring to ensure no other underlying issues contribute to the error.

5. What Tools Do I Need to Fix Audi DTC 01794:035?

To address Audi DTC 01794:035, you’ll need a VAG-compatible diagnostic tool, a reliable power supply, and possibly specialized tools for module programming, all of which AutoExplain.com can remotely assist you with, providing expert guidance and support.

• VAG-Compatible Diagnostic Tool: VCDS, ODIS, or similar tools are essential for scanning, coding, and adaptation.
• Stable Power Supply: To prevent voltage drops during coding, which can cause further issues.
• Access to Repair Manuals: For module-specific procedures and wiring diagrams.
• Module Programming Tools: If the module requires flashing or extensive programming.

6. Step-by-Step Guide on How to Fix Audi DTC 01794:035

Here is a step-by-step guide on how to address and resolve Audi DTC 01794:035, which may require assistance from AutoExplain.com due to the complexity of module coding and adaptation.

1. Initial Scan:

• Connect the diagnostic tool to the vehicle and perform a full scan.
• Note all fault codes present, especially the 01794:035.

2. VIN Verification:

• Access the affected control module through the diagnostic tool.
• Check the VIN stored in the module against the vehicle’s VIN (usually found on the windshield or door jamb).
• Confirm the VIN mismatch.

3. VIN Adaptation:

• Enter the adaptation menu for the control module.
• Look for the channel related to VIN learning or adaptation (often channel 81 in steering modules).
• Attempt to enter the correct VIN. If the “New Value” field is greyed out:
• Ensure the diagnostic tool is in the correct mode (e.g., Basic Settings or Adaptation).
• Check for any security access requirements and enter the necessary code.
• Verify the tool has the latest software and firmware.

4. Security Access:

• Some modules require a security access code before adaptation can be performed.
• Consult the repair manual or online resources for the correct security code for the specific module.
• Enter the security access code in the diagnostic tool.

5. Basic Settings and Coding:

• After entering the VIN, perform any necessary basic settings or coding procedures.
• For example, in the case of a steering angle sensor (G85), perform the steering angle sensor calibration.

6. Clearing Fault Codes:

• After completing the VIN adaptation and basic settings, clear all fault codes.
• Perform another scan to ensure the 01794:035 code is no longer present.

7. Test Drive:

• Take the vehicle for a test drive to ensure the affected systems are functioning correctly.
• Monitor for any warning lights or unusual behavior.

Example: Steering Wheel Module Adaptation on Audi A4 B6

1. Accessing the Module:

• Using VCDS, select “16 – Steering Wheel.”

2. Checking Existing VIN:

• Go to “Measuring Blocks” and check the VIN stored in the module.

3. Security Access (if required):

• Go to “Security Access – 16” and enter the appropriate code (e.g., 04011).

4. Adaptation:

• Go to “Adaptation – 10.”
• Enter channel “81.”
• Enter the correct VIN.
• Save the new value.

5. Final Steps:

• Clear any fault codes.
• Perform a steering angle sensor calibration if necessary.

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7. What are the Common Mistakes to Avoid When Fixing Audi DTC 01794:035?

When addressing Audi DTC 01794:035, avoid incorrect VIN entry, neglecting security access, overlooking basic settings, and failing to update module software, which can be expertly managed with AutoExplain.com’s comprehensive diagnostic support.

• Incorrect VIN Entry: Double-check the VIN before entering it into the module.
• Neglecting Security Access: Always check if the module requires a security access code before attempting to recode it.
• Overlooking Basic Settings: Ensure all necessary basic settings and adaptations are performed after VIN coding.
• Failing to Update Module Software: Ensure the module’s software is up-to-date to avoid compatibility issues.

8. How Does the Steering Angle Sensor (G85) Affect the 01794:035 Error?

The Steering Angle Sensor (G85) is related to the 01794:035 error. A mismatch or incorrect calibration of the G85 can trigger ABS and ESP warning lights, which can be accurately resolved with AutoExplain.com.

• ارتباط:
• The steering angle sensor (G85) provides data to the ABS/ESP system.
• If the steering control module has an incorrect VIN, it can affect the G85 calibration.
• Symptoms:
• ABS and ESP warning lights may illuminate.
• The vehicle may experience issues with stability control systems.
• Solution:
• After correcting the VIN, perform a steering angle sensor calibration using a diagnostic tool.
• Ensure the ABS module is correctly coded.

9. How Can You Prevent Audi DTC 01794:035 in the Future?

To prevent Audi DTC 01794:035 in the future, ensure correct VIN coding, verify module compatibility, keep software updated, and use professional diagnostic tools, which can be easily maintained with AutoExplain.com’s support and guidance.

• Ensure Correct VIN Coding: Always double-check the VIN when installing a new control module.
• Verify Module Compatibility: Ensure the replacement module is compatible with the vehicle.
• Keep Software Updated: Regularly update the diagnostic tool and module software.
• Use Professional Diagnostic Tools: Invest in high-quality diagnostic tools for accurate coding and adaptation.

10. How to Recode an ABS Module to Resolve the 01794:035 Error?

Recoding an ABS module to resolve the 01794:035 error involves accessing the ABS module, entering the correct coding, performing basic settings, and clearing fault codes, all professionally supported by AutoExplain.com’s remote assistance.

• Access the ABS Module:
• Using VCDS, select “03 – ABS Brakes.”
• Check Existing Coding:
• Record the existing coding for reference.
• Enter Correct Coding:
• Enter the correct coding based on the vehicle’s specifications (refer to repair manual or online resources).
• Perform Basic Settings:
• Perform any necessary basic settings, such as steering angle sensor calibration.
• Clear Fault Codes:
• Clear all fault codes and re-scan to ensure the issue is resolved.

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11. Why is the “New Value” Field Greyed Out When Trying to Adapt the VIN?

If the “New Value” field is greyed out when adapting the VIN, it typically indicates a security access issue, incorrect diagnostic tool mode, or tool incompatibility, all resolvable with AutoExplain.com’s expert diagnostic support.

• Security Access:
• The module may require a security access code before adaptation can be performed.
• Enter the correct security access code in the diagnostic tool.
• Incorrect Tool Mode:
• Ensure the diagnostic tool is in the correct mode (e.g., Basic Settings or Adaptation).
• Tool Incompatibility:
• Verify the diagnostic tool is compatible with the vehicle and module.
• Update the tool’s software and firmware.

12. How Does a Faulty Engine Mount Solenoid Valve Relate to the Diagnostic Scan?

A faulty engine mount solenoid valve, as indicated in the diagnostic scan, doesn’t directly relate to the 01794:035 error. However, addressing all identified issues ensures comprehensive vehicle health, which AutoExplain.com can assist with through detailed diagnostics.

• Unrelated Issue:
• The engine mount solenoid valve is related to the engine’s vibration damping system.
• It does not directly affect the VIN or control module coding.
• Importance of Addressing All Faults:
• While unrelated, it’s essential to address all identified fault codes for optimal vehicle performance.

13. How Do Air Conditioning Faults Affect the Overall Diagnostic Process?

Air conditioning faults, such as those related to the temperature flap or recirculation motor, don’t directly impact the 01794:035 error. Addressing these faults ensures comprehensive vehicle maintenance, a service AutoExplain.com can expertly provide.

• Independent Systems:
• Air conditioning faults are typically independent of the control module VIN issue.
• These faults relate to the HVAC system’s functionality.
• Comprehensive Approach:
• Addressing all identified faults ensures the vehicle operates correctly and comfortably.

14. What is the Role of Central Convenience Module in the 01794:035 Error?

The central convenience module does not directly relate to the 01794:035 error. Addressing these faults ensures comprehensive vehicle maintenance, a service AutoExplain.com can expertly provide.

• Independent Systems:
• The central convenience module faults are typically independent of the control module VIN issue.
• These faults relate to the vehicle access system’s functionality.
• Comprehensive Approach:
• Addressing all identified faults ensures the vehicle operates correctly and comfortably.

15. Why is Key Programming Important After Correcting the 01794:035 Error?

Key programming becomes essential after correcting the 01794:035 error. It ensures the vehicle recognizes the keys, maintains security, and integrates replacement modules properly, all of which AutoExplain.com can assist with through comprehensive programming services.

• ارتباط:
• After correcting the 01794:035, it is important to ensure that the key system functions correctly.
• Symptoms:
• The vehicle may not start correctly.
• The remote entry system may fail to function correctly.
• Solution:
• After correcting the 01794:035, perform key programming using a diagnostic tool.
• Ensure the immobilizer system is correctly coded.

16. How Does Cruise Control Relate to the 01794:035 Error?

Cruise control functionality is directly related to the 01794:035 error. Correcting the VIN mismatch in the steering control module is essential for restoring cruise control functionality.

• ارتباط:
• After correcting the 01794:035, it is important to ensure that the cruise control functions correctly.
• Symptoms:
• The cruise control may fail to engage.
• The cruise control may engage intermittently.
• Solution:
• After correcting the 01794:035, perform a test to ensure that the cruise control system functions correctly.
• Ensure the cruise control stalk is correctly coded.

17. Is an Audi Dealer the Only Place to Fix the 01794:035 Error?

While an Audi dealer can fix the 01794:035 error, specialized independent shops and remote services like AutoExplain.com offer equally capable and often more convenient solutions, saving time and money.

• Dealership Option:
• Audi dealerships have the expertise and tools to address the 01794:035 error.
• Independent Shops:
• Specialized independent shops with VAG-compatible diagnostic tools can also perform the necessary coding and adaptation.
• Remote Services:
• AutoExplain.com offers remote diagnostic and coding services, providing a convenient and cost-effective solution.

18. Can Aftermarket Parts Cause the 01794:035 Error?

Aftermarket parts, particularly control modules, can cause the 01794:035 error if they are not correctly coded or are incompatible with the vehicle, which can be avoided with professional coding services like those offered by AutoExplain.com.

• Potential Issues:
• Aftermarket control modules may not have the correct VIN programmed.
• Incompatibility issues can arise if the aftermarket part is not designed for the specific vehicle.
• Ensuring Compatibility:
• Always verify the compatibility of aftermarket parts before installation.
• Ensure the aftermarket module is correctly coded to the vehicle.

19. Will the 01794:035 Error Cause My Audi to Fail an Inspection?

Yes, the 01794:035 error can cause your Audi to fail an inspection, as it indicates a VIN mismatch, potentially affecting system functionality and compliance, which can be resolved promptly with AutoExplain.com’s diagnostic and coding services.

• Inspection Criteria:
• Many vehicle inspections check for correct VIN coding and system functionality.
• A VIN mismatch can indicate a tampered or incorrectly configured control module.
• Addressing the Error:
• Correct the 01794:035 error before the inspection to ensure compliance.

20. How to Clear the 01794:035 Error After Fixing the Issue?

To clear the 01794:035 error after fixing the issue, use a diagnostic tool to clear fault codes, perform a system reset if necessary, and rescan to confirm the error is gone, all of which AutoExplain.com can guide you through remotely.

• Diagnostic Tool:
• Connect the diagnostic tool to the vehicle.
• Select the control module where the error was present.
• Clear Fault Codes:
• Use the tool to clear all fault codes in the module.
• Verify the Fix:
• Rescan the module to ensure the 01794:035 error is no longer present.
• System Reset:
• If necessary, perform a system reset or adaptation to ensure all systems are functioning correctly.

21. What Are the Long-Term Effects of Ignoring the 01794:035 Error?

Ignoring the 01794:035 error can lead to system malfunctions, safety issues, inspection failures, and potential resale value reduction, all of which can be prevented with timely intervention from AutoExplain.com.

• System Malfunctions:
• Affected systems may not function correctly, leading to performance issues.
• Safety Issues:
• Safety systems like ABS and ESP may be compromised.
• Inspection Failure:
• The vehicle may fail inspection due to the VIN mismatch.
• Resale Value:
• A persistent error can reduce the vehicle’s resale value.

22. How Does AutoExplain.com Assist in Resolving the Audi DTC 01794:035 Error?

AutoExplain.com offers expert remote support, accurate VIN verification, step-by-step guidance, and comprehensive diagnostic services to efficiently resolve Audi DTC 01794:035, ensuring optimal vehicle performance and safety.

• Expert Remote Support:
  AutoExplain.com provides expert remote support to diagnose and resolve the Audi DTC 01794:035 error, offering step-by-step guidance to ensure your Audi’s systems function correctly. Our team of experienced technicians can remotely access your vehicle’s diagnostic data, accurately verify the VIN, and provide comprehensive diagnostic services to efficiently resolve the issue.
• Accurate VIN Verification:
  Our remote support includes accurate VIN verification, ensuring the VIN stored in the control module matches your vehicle’s actual VIN, preventing any functional issues or warning lights on the dashboard. We help you identify and correct any discrepancies, ensuring all systems are correctly configured.
• Comprehensive Diagnostic Services:
  AutoExplain.com offers thorough diagnostic services to pinpoint the cause of the VIN mismatch, whether it’s due to control module replacement, ECU software update errors, or incorrect VIN coding during installation. Our remote support ensures the error is resolved efficiently, restoring your vehicle’s optimal performance and safety.
• Benefits of AutoExplain.com:
  By choosing AutoExplain.com, you benefit from quick, efficient, and reliable solutions without the need to visit a physical service center. Our remote support saves you time and money while ensuring your Audi operates at its best. We provide peace of mind with our expert assistance and comprehensive diagnostic services, tailored to meet your specific needs.

Do you need help resolving the Audi DTC 01794:035 error? Contact AutoExplain.com now for expert remote support and diagnostic services. Reach us via WhatsApp at (+84)967469410 or email us at [email protected]. Visit our website at AutoExplain.com for more information. Our office is located at 1500 N Grant ST Sten Denver, CO 80203.

FAQ: Audi DTC 01794:035

Here are some frequently asked questions to help you better understand and address the 01794:035 error:

1. What does the Audi DTC 01794:035 error code mean?

The Audi DTC 01794:035 error code means that there is a mismatch between the Vehicle Identification Number (VIN) stored in a control module and the actual VIN of the car.

2. What are the common causes of the 01794:035 error?

Common causes include replacing a control module without proper coding, errors during ECU software updates, or incorrect VIN coding during installation.

3. What symptoms might I experience with the 01794:035 error?

Symptoms can include warning lights on the dashboard (such as ABS or ESP lights), system malfunctions (like cruise control not working), and communication errors when using diagnostic tools.

4. Can I fix the 01794:035 error myself?

While it is possible to fix the error yourself with the right tools and knowledge, it often requires professional diagnostic equipment and expertise. Services like AutoExplain.com can provide remote support to guide you through the process.

5. What tools do I need to fix the 01794:035 error?

You will need a VAG-compatible diagnostic tool (like VCDS or ODIS), a stable power supply, and access to repair manuals. Module programming tools may also be necessary.

6. How do I perform VIN adaptation to fix the 01794:035 error?

Use a diagnostic tool to access the affected control module, enter the adaptation menu, and look for the channel related to VIN learning or adaptation (often channel 81 in steering modules). Enter the correct VIN and save the new value.

7. Why is the “New Value” field greyed out when trying to adapt the VIN?

This usually indicates a security access issue, an incorrect diagnostic tool mode, or tool incompatibility. Ensure you have the correct security access code and that your tool is compatible with the vehicle and module.

8. How does the Steering Angle Sensor (G85) affect the 01794:035 error?

An incorrect VIN in the steering control module can affect the G85 calibration, leading to ABS and ESP warning lights. After correcting the VIN, perform a steering angle sensor calibration.

9. Can aftermarket parts cause the 01794:035 error?

Yes, aftermarket control modules can cause this error if they are not correctly coded or are incompatible with the vehicle. Always verify compatibility and ensure proper coding.

10. Will the 01794:035 error cause my Audi to fail an inspection?

Yes, the 01794:035 error can cause your Audi to fail an inspection, as it indicates a VIN mismatch, which can affect system functionality and compliance.

Contact AutoExplain.com for expert assistance in resolving the Audi DTC 01794:035 error. Reach us via WhatsApp at (+84)967469410 or email us at [email protected]. Visit our website at AutoExplain.com for more information. Our office is located at 1500 N Grant ST Sten Denver, CO 80203. Let us help you ensure your Audi is running smoothly and safely.