If you own a BMW and are experiencing issues with the locking system, you may have come across the fault code 801C20. This fault code is related to the ZGM (central gateway module) and indicates that the fault memory is full, but there is no control unit fault.

One of the possible causes of this fault code is a voltage drop during the battery replacement process, which can cause the central gateway module to lose its programming.

This can also lead to issues with the locking system, as the central gateway module is responsible for controlling various functions in the vehicle, including the locking system.

How to fix 801c20 fault code

To fix this issue, it is recommended to have the central gateway module reprogrammed by a professional mechanic or technician using a BMW diagnostic tool.

This should clear the fault memory and restore the functionality of the locking system. It’s important to address this issue as soon as possible to avoid any further complications with the vehicle’s electronic systems.

Requirements to fix 801c20 fault code on BMW

To fix the BMW 801C20 fault code related to the ZGM (central gateway module), you would need the following hardware and software:

Hardware:

• BMW diagnostic tool capable of communicating with the ZGM module, such as the BMW ICOM Next, Autel MaxiSYS Elite, or Launch X431 V+.
• A laptop or PC with the necessary software installed to run the diagnostic tool.

Software:

• BMW diagnostic software, such as ISTA-D (Integrated Service Technical Application – Diagnosis), ISTA-P (Integrated Service Technical Application – Programming), or Rheingold.
• Programming software to reprogram the ZGM module.

Discover the complete diagnostic kit for BMW

You may also want to check out the top 5 diagnostic software for BMW for to master in 2023. With these hardware and software tools, a professional mechanic or technician can diagnose the issue and reprogram the ZGM module to clear the fault memory and restore the functionality of the locking system.

Download ISTA P diagnostic software for free

If you need ISTA P diagnostic software download, feel free to reach out to us and we will send you the download links and installation instructions. You will need it to fix DTC 801c20 code on your BMW.

It’s important to have the necessary equipment and expertise to properly diagnose and repair electronic issues in BMW vehicles. You may also need to check out top 5 BMW logger software list here.