P0627 Fuel Pump A Control Circuit Open

Definition: The OBD2 code P0627 indicates that there is an open circuit in the control circuit of the fuel pump “A”. This means that the Engine Control Module (ECM) has detected a problem with the electrical circuit controlling the fuel pump, which can affect fuel delivery to the engine.

P0627 – Fuel Pump A Control Circuit Open

Typical Severity: Moderate

Common Causes

P0627 – Fuel Pump A Control Circuit Open

Common Causes:

• Faulty fuel pump relay
• Open or short circuit in the wiring harness
• Corroded electrical connectors
• Defective fuel pump control module

 

Common Misdiagnosis

OBD2 Code: P0627

Description: Fuel Pump A Control Circuit Open

Common Misdiagnosis: Replacing the fuel pump without checking for wiring issues or a faulty fuel pump relay.

OBD2 Code: P0003

Description: Fuel Volume Regulator Control Circuit Low

Common Misdiagnosis: Assuming the fuel pressure sensor is faulty instead of inspecting the wiring and connectors for damage or corrosion.

 

Common Diagnostic Steps

OBD2 Code: P0627

Description: Fuel Pump A Control Circuit Open

• Check the fuel pump relay and fuse for proper operation.
• Inspect the wiring and connectors in the fuel pump circuit for damage or corrosion.
• Test the voltage at the fuel pump connector to ensure power is reaching the pump.
• Examine the ground connection for the fuel pump to ensure it is secure and free of corrosion.
• If equipped, check for any related fault codes that may indicate a problem with other components in the system.
• Perform a continuity test on all wires in the fuel pump circuit to identify any open circuits.
• If necessary, replace faulty components such as relays, fuses, or wiring harnesses.