P1648-vw Apr 2026

Using a wiring diagram, check continuity of the high and low CAN Bus wires (usually orange/black and orange/brown) between the TCM and ECM. 4. Typical Fixes

If internal module damage is diagnosed. If you can provide: The exact vehicle year and model (e.g., 2004 Passat 1.8T). Any other fault codes (e.g., P1626, ABS codes). If the ABS or Transmission light is on. p1648-vw

Data Bus Powertrain – Malfunction / No Communication. Using a wiring diagram, check continuity of the