BMW DTC U1805 – Hybrid/EV Powertrain Control Module Lost Communication With Electric/Auxiliary Transmission Fluid Pump Control Module
DTC U1805 meaning on BMW
The Diagnostic Trouble Code (DTC) U1805 on a BMW indicates that there is a communication error between the Hybrid/EV Powertrain Control Module and the Electric/Auxiliary Transmission Fluid Pump Control Module.
BMW DTC U1805 symptoms
Symptoms of the DTC U1805 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Hybrid/EV system may not operate as expected
- Transmission-related issues
BMW DTC U1805 causes
Common causes of the DTC U1805 on a BMW include:
- Faulty Hybrid/EV Powertrain Control Module
- Faulty Electric/Auxiliary Transmission Fluid Pump Control Module
- Wiring or connection issues
BMW DTC U1805 seriousness
The DTC U1805 on a BMW should be addressed promptly as it can affect the proper functioning of the Hybrid/EV system and potentially lead to transmission problems. Ignoring this code may result in further damage to the vehicle.
How to diagnose DTC U1805 on BMW
To diagnose the DTC U1805 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connections between the Hybrid/EV Powertrain Control Module and the Electric/Auxiliary Transmission Fluid Pump Control Module
- Check the functionality of both control modules
How to fix DTC U1805 on BMW
To fix the DTC U1805 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connectors
- Replace the faulty Hybrid/EV Powertrain Control Module or Electric/Auxiliary Transmission Fluid Pump Control Module
- Clear the fault codes and perform a test drive to ensure the issue is resolved
How to erase DTC U1805 on BMW
To erase the DTC U1805 on a BMW, a mechanic can use a diagnostic scanner to clear the fault codes stored in the vehicle’s system. Once the codes are cleared, the Check Engine Light should turn off. It is important to ensure that the underlying issue causing the fault code has been addressed before clearing the code.
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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