P0629 Fuel Pump A Control Circuit High

• OBD2 Code: P0629
• Description: Fuel Pump A Control Circuit High
• Definition: This code indicates that the powertrain control module (PCM) has detected a high voltage condition in the fuel pump “A” control circuit.

p0629 – Fuel Pump A Control Circuit High

Typical severity: Severe

Common Causes

P0629 – Fuel Pump A Control Circuit High

Common causes:

• Faulty fuel pump relay
• Short circuit in the fuel pump wiring
• High resistance in the fuel pump circuit
• Defective fuel pump control module

 

Common Misdiagnosis

OBD2 Code: P0629

Description: Fuel Pump A Control Circuit High

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

 

Common Diagnostic Steps

OBD2 Code: P0629

Description: Fuel Pump A Control Circuit High

• Check the fuel pump relay and its connections for any signs of damage or corrosion.
• Inspect the wiring harness and connectors leading to the fuel pump for any breaks, shorts, or disconnections.
• Test the voltage at the fuel pump connector to ensure it is receiving power when activated.
• Examine the fuel pump control module for faults or failures that could cause high circuit conditions.
• Use a scan tool to clear the code and perform a road test to see if it returns, indicating an intermittent issue.
• If equipped, check for related codes that might indicate issues with other components in the fuel system.