Troubleshooting Volkswagen Passat Automatic Transmission Issues

Affected Vehicles

This technical service bulletin applies to the 2006-2007 Volkswagen Passat Sedan (3C2) models equipped with the 2.0L Turbo (BPY) or 3.6L (BLV) engines and the 6-Speed Automatic Transmission.

Common Issue: Transmission Won't Shift Out of Park

Customers may report that the vehicle's automatic transmission will not shift out of the Park position. This condition can be accompanied by Diagnostic Trouble Codes (DTCs) indicating 'No Communication' with the Transmission Control Module (TCM), such as U0101, 28773, or 01315.

Diagnostic Approach

The primary causes identified for this issue often relate to electrical system integrity. Key areas to inspect include:

• Fuse Integrity: Check fuses SC24, SB1, and SB6 for being open, missing, or improperly seated.
• Power and Ground Connections: Inspect for poor or corroded power and ground connections, particularly at the TCM and Multifunction Switch (MFS).
• Wiring Harness: Verify the condition and continuity of wiring connections and circuits to the TCM and MFS.
• Ground Circuit 673: Test the integrity of ground circuit 673.

The bulletin provides detailed diagnostic flowcharts and pin assignment tables to guide technicians through testing procedures. In many cases, no production change is required, and the solution involves addressing the identified electrical faults.

Information provided by ALLDATA Repair, Technical Service Bulletin 37 07 12.

For detailed repair procedures and pin assignments, refer to the original ALLDATA documentation.