P0627 Fault Code

Fuel Pump A Control Circuit / Open

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0627 fault code indicates a problem with the fuel pump A control circuit, which can be due to an open circuit or a malfunctioning component. This code may trigger the check engine light because the engine control unit (ECU) detects that the fuel pump is not functioning as it should. Understanding this code is essential for diagnosing fuel delivery issues, as fuel pumps play a crucial role in maintaining engine performance.

What are the symptoms of the P0627 code?

Drivers may notice various symptoms when the P0627 code is present, including:

• The engine may have difficulty starting or may not start at all.
• Intermittent engine stalling due to inadequate fuel delivery.
• A significant decrease in engine performance or hesitation during acceleration.
• Unusual noises coming from the fuel pump area, indicating possible malfunction.

What causes the P0627 code?

Several factors can lead to the P0627 code. Common causes include:

• A damaged or broken wire in the fuel pump circuit.
• A faulty fuel pump relay that fails to send power to the fuel pump.
• A defective fuel pump itself that no longer functions correctly.
• Poor electrical connections, such as corrosion or loose connectors, affecting circuit continuity.

How to fix P0627?

To address the P0627 code, it is important to follow a series of diagnostic steps:

1. Inspect the wiring and connectors in the fuel pump circuit for any visible damage or corrosion.
2. Test the fuel pump relay for proper operation and replace if necessary.
3. Check the fuel pump for functionality by measuring its voltage and ground supply.
4. If the pump is faulty, replacing it may be necessary to resolve the issue.
5. Always clear the code and test drive the vehicle to ensure that the problem is resolved.