DTC P1649 Audi
Data Bus Powertrain Missing Message from ABS Control Module
Data Bus Powertrain Missing Message from ABS Control Module
Description
Ignition off, the ECU is missing general Data BUS information from the central electrical control. The Engine Control Module (ECM) communicates with all databus-capable control modules via a CAN databus. These databus-capable control modules are connected via two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the databus is recognized as a malfunction and stored. Trouble-free operation of the CAN-bus requires that it have a terminal resistance. This central terminal resistor is located in the Engine Control Module (ECM).
Cause and Solution
Ground between engine and chassis may be broken
Throttle position sensor may have failed
Accelerator Pedal Position Sensor 2 has failed
Throttle position sensor wiring may have shorted
Faulty voltage supply
Check the Terminal resistance for CAN-bus
Data-Bus wires have short
Data-Bus components are malfunctioning
Video Guide
Diagnostic Info
- DTC Code: P1649
- Brand: Audi