801C20 – BMW DTC

BMW DTC 801C20 – BCP-ZGM: Recording of the measured data deactivated

DTC 801C20 meaning on BMW

DTC 801C20 refers to a diagnostic trouble code indicating that the recording of the measured data has been deactivated in the BMW’s Body Control Module (BCM) or ZGM (Zentraler Gateway Modul). This code typically signifies an issue with data logging or communication within the vehicle’s electronic systems.

BMW DTC 801C20 symptoms

Common symptoms associated with DTC 801C20 may include:

• Inability to access certain vehicle data
• Malfunctioning of electronic components
• Warning lights illuminated on the dashboard
• Potential issues with vehicle performance

BMW DTC 801C20 causes

The causes of DTC 801C20 can vary, but typical reasons include:

• Faulty Body Control Module (BCM)
• Wiring issues or poor connections
• Software glitches or outdated firmware
• Corrupted data or memory issues within the module

BMW DTC 801C20 seriousness

DTC 801C20 is considered a moderate issue. While it may not immediately affect the drivability of the vehicle, it can lead to more significant problems if not addressed. The inability to record measured data can hinder diagnostics and troubleshooting of other potential issues.

How to diagnose DTC 801C20 on BMW

To diagnose DTC 801C20, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Retrieve the DTCs stored in the system.
3. Check for any additional codes that may provide context.
4. Inspect the wiring and connectors related to the BCM.
5. Verify the software version of the BCM and check for updates.
6. Perform a visual inspection of the BCM for any signs of damage.

How to fix DTC 801C20 on BMW step-by-step instructions

To fix DTC 801C20, follow these steps:

1. Ensure the vehicle is turned off and disconnect the battery.
2. Inspect and repair any damaged wiring or connectors related to the BCM.
3. Reconnect the battery and turn on the ignition.
4. Update the BCM software if necessary using a compatible diagnostic tool.
5. Clear the DTCs using the OBD-II scanner.
6. Test drive the vehicle to ensure the code does not return.

How to erase DTC 801C20 on BMW

To erase DTC 801C20, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the diagnostic menu and select the option to clear codes.
3. Confirm the action to erase the DTCs.
4. Disconnect the scanner and turn off the ignition.
5. Restart the vehicle and check if the code reappears.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

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