BMW DTC U1814 – Lost Communication With Status 2 Hybrid/EV Battery
DTC U1814 meaning on BMW
DTC U1814 on a BMW indicates a communication error with the Status 2 Hybrid/EV Battery. This diagnostic trouble code (DTC) is specific to hybrid or electric vehicles and suggests a problem with the communication system between the vehicle’s control modules and the hybrid/EV battery.
BMW DTC U1814 symptoms
Symptoms of DTC U1814 on a BMW may include:
- Check Engine Light (CEL) illuminated
- Hybrid/EV system warning light on
- Reduced hybrid/EV performance
- Loss of regenerative braking
BMW DTC U1814 causes
Possible causes of DTC U1814 on a BMW include:
- Faulty hybrid/EV battery
- Issues with the communication network
- Faulty control module
- Wiring or connection problems
BMW DTC U1814 seriousness
The seriousness of DTC U1814 on a BMW depends on the underlying cause. Ignoring this code can lead to reduced hybrid/EV performance and potential safety issues. It is recommended to address this issue promptly to ensure the proper functioning of the hybrid/EV system.
How to diagnose DTC U1814 on BMW
To diagnose DTC U1814 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the hybrid/EV battery for any visible damage
- Check the wiring and connections related to the hybrid/EV system
- Perform a communication system test to identify any network issues
How to fix DTC U1814 on BMW
To fix DTC U1814 on a BMW, you may need to:
- Repair or replace the faulty hybrid/EV battery
- Address any wiring or connection issues
- Reset the control modules and clear the fault codes
- Perform a system reset or calibration as needed
How to erase DTC U1814 on BMW
To erase DTC U1814 on a BMW, you can:
- Use a diagnostic scanner to clear the fault codes
- Ensure that the underlying issue has been resolved before clearing the code
- Perform a test drive to confirm that the code does not return
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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