P1648-vw

Secondary Air Injection System Incorrect Flow Detected. P1648. 18056. Data Bus Powertrain Malfunction. Customer. JustAnswer Jeep Grand Cherokee Diesel P0700 P1648 Codes Explained

Broken, shorted, or corroded wiring in the powertrain CAN bus network. 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 Secondary Air Injection System Incorrect Flow Detected

Repairing broken CAN bus wires.

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.

I can help identify the most likely culprit and direct you to the specific module to check. VW P1648 Code: Troubleshooting and Solutions | JustAnswer