Audi P1604: Internal Control Module Driver Error

What Does The Audi P1604 Code Mean?

Ignition on, the ECM detected a control module malfunction. 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 P1604 Code?

• (If ECM was replaced) ECM ID not the same as the replaced unit
• ECM has failed
• Voltage supply for Engine Control Module (ECM) has shorted

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 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 59.