BMW DTC U1842 – Universal Charger Extension Control Module Lost Communication With Hybrid Battery Control Module
DTC U1842 meaning on BMW
DTC U1842 on a BMW indicates that there is a communication error between the Universal Charger Extension Control Module and the Hybrid Battery Control Module. This error code signifies that the modules are not able to exchange information properly, which can lead to issues with the hybrid system’s operation.
BMW DTC U1842 symptoms
Symptoms of DTC U1842 on a BMW may include:
- Check Engine Light (CEL) illuminated
- Hybrid system warning light on
- Hybrid system not functioning optimally
BMW DTC U1842 causes
The possible causes of DTC U1842 on a BMW include:
- Faulty Universal Charger Extension Control Module
- Faulty Hybrid Battery Control Module
- Wiring or connection issues between the modules
BMW DTC U1842 seriousness
The seriousness of DTC U1842 on a BMW lies in the fact that it can affect the proper functioning of the hybrid system. Ignoring this error code may lead to reduced hybrid system performance and potential drivability issues.
How to diagnose DTC U1842 on BMW
To diagnose DTC U1842 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connections between the Universal Charger Extension Control Module and the Hybrid Battery Control Module
- Check the modules for any visible damage or signs of malfunction
How to fix DTC U1842 on BMW
To fix DTC U1842 on a BMW, you may need to:
- Replace the faulty Universal Charger Extension Control Module or Hybrid Battery Control Module
- Repair any damaged wiring or connections between the modules
- Clear the fault codes and perform a system reset
How to erase DTC U1842 on BMW
To erase DTC U1842 on a BMW, you can:
- Use a diagnostic scanner to clear the fault codes
- Perform a system reset to ensure the error code is no longer present
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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