P1648-vw

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

This is a communication error between ECUs, not necessarily a failed sensor. 1. Common Causes p1648-vw

The transmission or braking module itself is failing to communicate. Using a wiring diagram, check continuity of the

Data Bus Powertrain – Malfunction / No Communication. Using a wiring diagram

Broken, shorted, or corroded wiring in the powertrain CAN bus network.

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