U1128 – BMW DTC

BMW DTC U1128 – Lost Communication With Status EKP (Electrical Fuel Pump)

DTC U1128 meaning on BMW

The DTC U1128 code on a BMW indicates a communication error with the Electrical Fuel Pump (EKP) control module. This means that the Engine Control Module (ECM) is unable to establish communication with the EKP module, which is responsible for controlling the fuel pump operation.

BMW DTC U1128 symptoms

Symptoms of the DTC U1128 code on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Engine stalling or hesitation
• Difficulty starting the vehicle
• Reduced engine performance

BMW DTC U1128 causes

The DTC U1128 code on a BMW can be caused by various factors, including:

• Faulty EKP control module
• Wiring or connection issues between the ECM and EKP module
• Interference from other electronic components

BMW DTC U1128 seriousness

The DTC U1128 code should not be ignored as it can lead to potential fuel pump operation issues, which may result in engine performance problems or even stalling. It is recommended to address this code promptly to prevent further complications.

How to diagnose DTC U1128 on BMW

To diagnose the DTC U1128 code on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM
2. Check the wiring and connections between the ECM and EKP module for any damage or corrosion
3. Test the EKP module for proper functionality
4. Inspect other related components for potential issues

How to fix DTC U1128 on BMW

To fix the DTC U1128 code on a BMW, the following steps may be taken:

1. Repair or replace any damaged wiring or connections between the ECM and EKP module
2. Replace the faulty EKP control module if necessary
3. Clear the fault codes using a diagnostic scanner after the repairs have been completed
4. Perform a test drive to ensure the issue has been resolved

How to erase DTC U1128 on BMW

To erase the DTC U1128 code on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port
2. Select the option to clear fault codes from the ECM
3. Wait for the scanner to confirm that the fault codes have been successfully cleared
4. Disconnect the scanner and start the vehicle to ensure the code has been 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

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.