BMW DTC P0231 – Fuel Pump Secondary Circuit Low
DTC P0231 meaning on BMW
The Diagnostic Trouble Code (DTC) P0231 for BMW indicates a low voltage condition in the fuel pump secondary circuit. This code is specific to the fuel pump secondary circuit and is triggered when the voltage in this circuit falls below the specified threshold.
BMW DTC P0231 symptoms
Symptoms of DTC P0231 on a BMW may include:
- Engine stalling or hesitation during acceleration
- Difficulty starting the engine
- Loss of power while driving
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P0231 causes
The common causes of DTC P0231 on a BMW include:
- Faulty fuel pump
- Corroded or damaged wiring in the fuel pump circuit
- Defective fuel pump relay
- Issues with the fuel pump control module
BMW DTC P0231 seriousness
DTC P0231 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 stalling unexpectedly or not starting at all.
How to diagnose DTC P0231 on BMW
To diagnose DTC P0231 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer.
- Inspect the fuel pump relay and wiring for any visible damage or corrosion.
- Test the fuel pump’s voltage and current to ensure it is operating within specifications.
- Check the fuel pump control module for any faults or malfunctions.
How to fix DTC P0231 on BMW
To fix DTC P0231 on a BMW, you can try the following solutions:
- Replace the faulty fuel pump if it is determined to be the cause of the low voltage condition.
- Repair or replace any damaged wiring in the fuel pump circuit.
- Replace the fuel pump relay if it is found to be defective.
- If the issue lies with the fuel pump control module, consider replacing or reprogramming it.
How to erase DTC P0231 on BMW
To erase DTC P0231 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. Once the issue causing the fault code has been addressed and fixed, you can reset the codes to turn off the Check Engine Light and ensure the system is operating correctly.
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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