BMW DTC A559 – Dashboard: Voltage supply has been switched off (standby current cutoff relay)
DTC A559 meaning on BMW
DTC A559 indicates that the voltage supply has been switched off due to the standby current cutoff relay. This code is related to the vehicle’s electrical system and signifies that the power supply to certain components has been interrupted, which can affect various systems in the vehicle.
BMW DTC A559 symptoms
Common symptoms associated with DTC A559 may include:
- Dashboard warning lights illuminated
- Inoperative electrical components
- Difficulty starting the vehicle
- Erratic behavior of electronic systems
- Battery drain issues
BMW DTC A559 causes
The causes of DTC A559 can vary, but typical reasons include:
- Faulty standby current cutoff relay
- Wiring issues or short circuits
- Battery problems or low voltage
- Faulty control module
- Corrosion or poor connections in the electrical system
BMW DTC A559 seriousness
DTC A559 is considered a moderate to serious issue. While it may not cause immediate failure of the vehicle, it can lead to:
- Increased risk of electrical system failure
- Potential for battery drain
- Inability to start the vehicle
- Malfunctioning of critical systems
How to diagnose DTC A559 on BMW
To diagnose DTC A559, follow these steps:
- Use an OBD-II scanner to confirm the DTC and check for any related codes.
- Inspect the standby current cutoff relay for proper operation.
- Examine wiring and connectors for damage or corrosion.
- Test the battery voltage and condition.
- Check the control module for faults or updates.
How to fix DTC A559 on BMW step-by-step instructions
To fix DTC A559, perform the following steps:
- Replace the faulty standby current cutoff relay if necessary.
- Repair or replace damaged wiring and connectors.
- Charge or replace the battery if it is found to be weak.
- Update or replace the control module if it is malfunctioning.
- Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.
How to erase DTC A559 on BMW
To erase DTC A559, follow these steps:
- Connect an OBD-II scanner to the vehicle’s diagnostic port.
- Access the diagnostic menu and select the option to clear or erase codes.
- Confirm the action and wait for the scanner to complete the process.
- Disconnect the scanner and start the vehicle to 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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