BMW DTC U1804 – Hybrid/EV Powertrain Control Module Lost Communication With HIM (Hybrid Interface Module) via HL-CAN
DTC U1804 meaning on BMW
The Diagnostic Trouble Code (DTC) U1804 for BMW indicates that there is a communication error between the Hybrid/EV Powertrain Control Module and the Hybrid Interface Module (HIM) via the HL-CAN (Hybrid Local Controller Area Network).
BMW DTC U1804 symptoms
Symptoms of the BMW DTC U1804 may include:
- Check Engine Light (MIL) illuminated
- Hybrid/EV system may not function properly
- Loss of communication with the HIM
BMW DTC U1804 causes
Possible causes of the BMW DTC U1804 include:
- Faulty Hybrid Interface Module (HIM)
- Issues with the HL-CAN communication network
- Wiring or connection problems
BMW DTC U1804 seriousness
The DTC U1804 on a BMW is considered serious as it can affect the proper functioning of the Hybrid/EV powertrain system. Ignoring this issue may lead to further complications and potential drivability problems.
How to diagnose DTC U1804 on BMW
To diagnose the DTC U1804 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Check the communication between the Hybrid/EV Powertrain Control Module and the HIM
- Inspect the wiring and connections related to the HL-CAN network
- Perform a visual inspection for any visible damage or loose connections
How to fix DTC U1804 on BMW
To fix the DTC U1804 on a BMW, you can try the following:
- Inspect and repair any damaged wiring or connections
- Replace the faulty Hybrid Interface Module (HIM) if necessary
- Clear the fault codes using a diagnostic scanner
- Perform a test drive to ensure the issue has been resolved
How to erase DTC U1804 on BMW
To erase the DTC U1804 on a BMW, you can use a diagnostic scanner to clear the fault codes. Follow these steps:
- Connect the diagnostic scanner to the vehicle’s OBD-II port
- Select the option to erase fault codes
- Confirm the action and wait for the process to complete
- Verify that the DTC U1804 has been successfully erased