How to Check Tire Pressure in VCDS

This guide explains how to use VCDS (Vag-Com Diagnostic System) to check and manage your VW or Audi’s tire pressure monitoring system (TPMS). We’ll cover different TPMS types, how to reset the system, and how to potentially switch between direct and indirect systems.

There are two main types of TPMS in Volkswagen and Audi vehicles:

• Indirect TPMS: This system uses the ABS wheel speed sensors to estimate tire pressure. If a tire’s diameter decreases (indicating low pressure), the system triggers a warning.
• Direct TPMS: This system utilizes sensors within each tire to directly measure pressure and temperature, transmitting data wirelessly to the car’s computer. Direct TPMS offers greater accuracy but requires additional sensors.

Resetting the TPMS Light with VCDS

For Direct TPMS:

1. Inflate all tires to the recommended pressure (found on the driver’s side doorjamb or in your owner’s manual). Use a tire gauge to ensure accuracy. You may need to slightly overinflate then deflate to the correct pressure.
2. If the light persists, further diagnostics with VCDS might be required.

For Indirect TPMS:

1. Inflate all tires to the recommended pressure. Verify with a tire gauge.
2. If your car is equipped with a TPMS reset button, press and hold it to reset the system.
3. If there’s no reset button, you can reset the system using VCDS:
   • Connect your VCDS cable and launch the software.
   • Select “Select” then “ABS controller”.
   • Go to “Basic Settings”, then “Group 042”.
   • Click “Go!” to reset the TPMS.

Activating the Hidden Indirect TPMS with VCDS

Some vehicles have a latent indirect TPMS that can be activated via VCDS. This is particularly useful if you have a second set of wheels without direct TPMS sensors.

Procedure:

1. Connect VCDS and access the “ABS controller” module.
2. Click on “Coding”, then “Long Coding Helper”. Record your original coding before making any changes.
3. Navigate to Byte 16.
4. Check the box for “Bit 2 – Tire pressure monitoring (TPMS/7K6) installed”.
5. Exit the Long Coding Helper and click “Do it!” to save the new coding.
6. The TPMS light should illuminate briefly upon ignition. The system requires approximately one hour of driving (including highway driving) to adapt.

Switching from Direct to Indirect TPMS (Advanced Users Only)

Disclaimer: Disabling or modifying the TPMS may be illegal in some regions. Consult local regulations before proceeding. This modification is complex and should only be attempted by experienced users. A malfunctioning TPMS can compromise safety.

This procedure requires disabling the direct TPMS and then activating the indirect system as described above. This process involves modifying settings in the “CAN Gateway”, “CECM” (Central Electronics Control Module), and “ABS controller” modules within VCDS. Always back up your original coding before making any changes. Refer to factory repair manuals and online resources for detailed instructions specific to your vehicle model.

Conclusion

VCDS provides a powerful interface for managing your vehicle’s TPMS. Whether you need to reset the light, activate a hidden system, or switch between TPMS types, understanding how to use VCDS can give you greater control over your car’s functionality. However, always exercise caution when modifying vehicle systems and prioritize safety. Remember to consult your owner’s manual and reputable online resources for specific instructions related to your car model and local regulations.