U1205 – BMW DTC

BMW DTC U1205 – Lost Communication With OBD Data Hybrid/EV Powertrain Control Module via A-CAN

DTC U1205 meaning on BMW

The Diagnostic Trouble Code (DTC) U1205 for BMW indicates a communication error between the On-Board Diagnostic (OBD) data system and the Hybrid/EV Powertrain Control Module via the A-CAN network. This error typically means that the OBD system is unable to establish communication with the powertrain control module, which can lead to various issues with monitoring and controlling the hybrid or electric powertrain components.

BMW DTC U1205 symptoms

Symptoms of the U1205 DTC on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Loss of power or performance issues
• Inability to monitor or control hybrid or electric powertrain functions
• Other related warning lights or messages on the instrument cluster

BMW DTC U1205 causes

The U1205 DTC on a BMW can be caused by various factors, including:

• Faulty Hybrid/EV Powertrain Control Module
• Issues with the A-CAN communication network
• Loose or corroded wiring connections
• Software glitches or malfunctions

BMW DTC U1205 seriousness

The U1205 DTC should be addressed promptly as it can lead to performance issues and potential safety concerns with the hybrid or electric powertrain system. Ignoring this code may result in further damage to the vehicle components and could affect the overall drivability of the BMW.

How to diagnose DTC U1205 on BMW

To diagnose the U1205 DTC on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer.
2. Inspect the wiring connections between the OBD system and the Hybrid/EV Powertrain Control Module for any damage or corrosion.
3. Check for any software updates or reprogramming needed for the powertrain control module.
4. Perform a thorough inspection of the A-CAN communication network for any faults or malfunctions.

How to fix DTC U1205 on BMW

To fix the U1205 DTC on a BMW, consider the following steps:

1. Repair or replace any damaged wiring connections between the OBD system and the powertrain control module.
2. If the Hybrid/EV Powertrain Control Module is faulty, replace it with a new or refurbished unit.
3. Ensure that the A-CAN communication network is functioning properly by addressing any issues found during inspection.
4. If necessary, update the software or reprogram the powertrain control module to resolve any compatibility issues.

How to erase DTC U1205 on BMW

To erase the U1205 DTC on a BMW, follow these steps:

1. Use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer.
2. After clearing the code, perform a test drive to ensure that the issue has been resolved.
3. If the Check Engine Light does not reappear and the vehicle operates normally, the DTC U1205 has been successfully erased.

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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