Volkswagen P1649: Data Bus Powertrain Missing Message from ABS Control Module

What Does The Volkswagen P1649 Code Mean?

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).

What Are The Potential Causes Of The Volkswagen P1649 Code?

• 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
• ECM has failed

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> Volkswagen Engine Control Module
>>> 1812089 Throttle Position Sensor
>>> Volkswagen Jetta Accelerator Pedal Sensor

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

Volkswagen P1649, DTCDECODE.