BMW DTC U1806 – Hybrid/EV Powertrain Control Module Lost Communication With DSM (Direct Shift Module) Control Module
DTC U1806 meaning on BMW
The Diagnostic Trouble Code (DTC) U1806 on a BMW indicates that there is a communication error between the Hybrid/EV Powertrain Control Module and the Direct Shift Module (DSM) Control Module. This means that the two modules are not able to exchange information properly, which can lead to various issues in the vehicle’s operation.
BMW DTC U1806 symptoms
Symptoms of the BMW DTC U1806 may include:
- Check Engine Light (MIL) illuminated
- Hybrid/EV system not functioning correctly
- Transmission shifting problems
- Reduced fuel efficiency
BMW DTC U1806 causes
Common causes of the BMW DTC U1806 include:
- Faulty Hybrid/EV Powertrain Control Module
- Faulty DSM Control Module
- Wiring or connection issues between the modules
- Software glitches
BMW DTC U1806 seriousness
The BMW DTC U1806 should be addressed promptly as it can lead to drivability issues and potentially affect the overall performance of the vehicle. Ignoring this code may result in further damage to the hybrid/EV system or transmission components.
How to diagnose DTC U1806 on BMW
To diagnose the DTC U1806 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Check for any other related codes or symptoms
- Inspect the wiring and connections between the Hybrid/EV Powertrain Control Module and the DSM Control Module
- Perform a communication test between the modules
How to fix DTC U1806 on BMW
To fix the BMW DTC U1806, you can try the following:
- Repair or replace any damaged wiring or connectors
- Update the software in the modules to the latest version
- Replace the faulty Hybrid/EV Powertrain Control Module or DSM Control Module if necessary
- Clear the fault codes and perform a test drive to ensure the issue is resolved
How to erase DTC U1806 on BMW
To erase the DTC U1806 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the system. After fixing the underlying issue causing the code, clearing the code will reset the Check Engine Light and allow you to monitor the system for any new faults.
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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