P0629 – BMW DTC

BMW DTC P0629 – Fuel Pump ‘A’ Control Circuit High

DTC P0629 meaning on BMW

DTC P0629 for BMW refers to a fault in the fuel pump ‘A’ control circuit where the voltage signal is detected to be higher than the specified range. This code indicates an issue with the control circuit that manages the fuel pump operation in the vehicle.

BMW DTC P0629 symptoms

Symptoms of DTC P0629 on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Engine stalling or hesitation during acceleration
• Difficulty starting the engine
• Reduced fuel efficiency

BMW DTC P0629 causes

Common causes of DTC P0629 on a BMW include:

• Faulty fuel pump relay
• Issues with the fuel pump control module
• Wiring or connection problems in the fuel pump circuit
• Defective fuel pump

BMW DTC P0629 seriousness

DTC P0629 should not be ignored as it can lead to potential drivability issues and engine performance problems. If left unresolved, it may result in the vehicle stalling unexpectedly or experiencing fuel delivery issues, which can affect the overall operation of the BMW.

How to diagnose DTC P0629 on BMW

To diagnose DTC P0629 on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the fuel pump relay and control module for any signs of damage or malfunction
3. Check the wiring and connections in the fuel pump circuit for loose connections or shorts
4. Test the fuel pump operation and voltage readings to determine if it is functioning within specifications

How to fix DTC P0629 on BMW

To fix DTC P0629 on a BMW, the following steps may be taken:

1. Replace the faulty fuel pump relay or control module if diagnosed as the root cause
2. Repair any damaged wiring or connections in the fuel pump circuit
3. If the fuel pump is defective, replace it with a new unit
4. Clear the fault code and reset the Check Engine Light using a diagnostic scanner

How to erase DTC P0629 on BMW

To erase DTC P0629 on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port
2. Access the scanner’s menu to clear the fault codes stored in the system
3. Follow the on-screen prompts to erase the DTC P0629 code
4. Once the code is cleared, disconnect the scanner and start the vehicle to ensure the Check Engine Light is no longer illuminated

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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