Audi P1648: Data Bus Powertrain Malfunction

What Does The Audi P1648 Code Mean?

Ignition on, the ECM detected a data bus malfunction (software). To achieve optimal anti-theft protection for the vehicle, an anti-theft immobilizer is installed. The anti-theft immobilizer is a system for enabling and locking the Engine Control Module (ECM).

So that this system cannot be circumvented, it is necessary to perform adaptation of the anti-theft immobilizer using the Vehicle Diagnostic and Information System VAS 5052 in the On Board Diagnostic (OBD) function. The great availability of equipment options makes it necessary to adapt the Engine Control Module (ECM) to the vehicle (e. g. throttle valve control module or cruise control system). This “writing” function is not possible with the generic scan tool.

What Are The Potential Causes Of The Audi P1648 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
• 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
>>> Audi Throttle position sensor
>>> Hellla 010946011 Accelerator Pedal Sensor
>>> Audi Engine Control Module

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

Reference Sources

Audi A4 Avant 95-01 Service Repair Manual, page 62.