P0628 – BMW DTC

BMW DTC P0628 – Fuel Pump ‘A’ Control Circuit Low

DTC P0628 meaning on BMW

The Diagnostic Trouble Code (DTC) P0628 for BMW refers to a fault in the fuel pump ‘A’ control circuit. This code indicates that the powertrain control module (PCM) has detected a low voltage condition in the control circuit of the fuel pump ‘A’.

BMW DTC P0628 symptoms

Symptoms of DTC P0628 on a BMW may include:

• Engine stalling or hesitation
• Difficulty starting the engine
• Reduced engine performance
• Illumination of the check engine light

BMW DTC P0628 causes

Common causes of DTC P0628 on a BMW include:

• Faulty fuel pump relay
• Wiring issues in the fuel pump control circuit
• Defective fuel pump
• PCM software issues

BMW DTC P0628 seriousness

DTC P0628 should be addressed promptly as it can lead to drivability issues and potential engine damage if the fuel pump is not functioning correctly. Ignoring this code may result in the vehicle not starting or stalling unexpectedly.

How to diagnose DTC P0628 on BMW

To diagnose DTC P0628 on a BMW, a mechanic should perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the fuel pump relay and related wiring for any visible damage
3. Test the fuel pump control circuit for continuity and proper voltage
4. Check the fuel pump operation and pressure

How to fix DTC P0628 on BMW

To fix DTC P0628 on a BMW, the following steps can be taken:

1. Replace the faulty fuel pump relay if necessary
2. Repair any damaged wiring in the fuel pump control circuit
3. Replace the fuel pump if it is found to be defective
4. Update the PCM software if required

How to erase DTC P0628 on BMW

To erase DTC P0628 on a BMW, follow these steps:

1. Use a diagnostic scanner to clear the fault code
2. Start the engine and ensure the code does not return
3. Perform a test drive to confirm the repair

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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