Connecting a VCDS tool to your car but getting a “No Response from Controller” message can be frustrating. This guide will walk you through common causes and solutions for this issue, specifically focusing on a 2003 Jetta Wagon case study.
The owner of a 2003 Jetta Wagon reported performance issues and inability to connect to the Engine Control Module (ECM) using a VCDS tool. While other modules responded, the ECM returned a “No Response from Controller” error. The VCDS interface and firmware were confirmed to be up-to-date. The car had no aftermarket radio installations that might interfere with communication. The following auto-scan results were obtained:
Sunday,30,July,2023,00:07:47:32588 VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64 VCDS Version: 23.3.1.0 (x64) HEX-V2 CB: 0.4631.4 Data version: 20230421 DS346.2 www.Ross-Tech.com VIN: WVWRP61J63W567344 License Plate: Mileage: 318340km-197807mi Repair Order: -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Chassis Type: 1J (1J - VW Golf/Bora IV (1998 > 2006)) Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75 76 VIN: WVWRP61J63W567344 Mileage: 318340km-197807miles ------------------------------------------------------------------------------- Address 03: ABS Brakes Labels: 1C0-907-37x-ABS.lbl Part No: 1C0 907 379 L Component: ABS FRONT MK60 0101 Coding: 0004097 Shop #: WSC 01266 785 00200 VCID: 33301697E7229C52C29-5184 No fault code found. ------------------------------------------------------------------------------- ...(Other module scans)... End----(Elapsed Time: 05:14, VBatt start/end: 11.9V/11.9V. VIgn 11.8V)-----Common Causes and Solutions for “No Response from Controller”
Several factors can cause a “No Response from Controller” error in VCDS:
1. Faulty Connection:
- Solution: Ensure the OBD-II connector is clean and fully seated. Check the VCDS cable for damage. Test the connection with a different OBD-II device if possible.
2. Low Battery Voltage:
- Solution: A weak battery can disrupt communication. Charge the battery fully or use a jump starter. The auto-scan shows good battery voltage in this case, but it’s always worth checking.
3. Blown Fuse:
- Solution: While the original post mentions Fuse 12 being checked, review the vehicle’s fuse diagram to identify other fuses related to the ECM and OBD-II port.
4. Faulty ECM Power Supply Relay:
- Solution: Locate and test the ECM power supply relay. A faulty relay can prevent the ECM from powering on and communicating.
5. Damaged Wiring:
- Solution: Inspect the wiring harness leading to the ECM and OBD-II connector for any damage, breaks, or corrosion. A wiring diagram for your specific vehicle model year is essential for this task.
6. Faulty ECM:
- Solution: If all other possibilities are ruled out, a faulty ECM might be the culprit. This requires further diagnostics and potentially replacement.
7. K-Line Issues (Older Vehicles): Some older VW/Audi models utilize the K-Line for communication.
- Solution: Ensure the K-Line is properly connected and functioning if applicable to your vehicle. Consult wiring diagrams for K-Line specifics.
Conclusion
Troubleshooting a “No Response from Controller” error in VCDS involves a systematic approach. Start with the simplest checks like connections and fuses, then progressively move towards more complex possibilities like wiring and the ECM itself. Using a wiring diagram and a multimeter are invaluable tools in this process. Remember to consult reputable resources like Ross-Tech’s website and forums for specific guidance related to your vehicle model.
