P1648-vw May 2026

Pull up the passenger-side carpet/sill panel, open the TCM plastic box, and look for water, condensation, or green corrosion on the pins.

Verify the ECM and TCM are receiving proper voltage and have good grounds. p1648-vw

Broken, shorted, or corroded wiring in the powertrain CAN bus network. Pull up the passenger-side carpet/sill panel, open the