Error code

OBD2 P0627

OBD2P0627
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Fuel Pump 'A' Control Circuit /Open.

Severity

highThe vehicle may be drivable but with significant performance issues and safety risks.

Summary

P0627 indicates an open circuit fault in the fuel pump 'A' control circuit. This issue can affect both gasoline and diesel vehicles but is most common on modern returnless systems.

Symptoms

  • Engine stalls or shuts off unexpectedly
  • Rough, erratic idling or inability to idle
  • Difficulty starting the engine
  • Reduced power during operation
  • Stumbling or hesitation upon acceleration

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and connectors
  • Poor ground connections in circuits related to fuel pump operation
  • Defective fuel pump relay
  • Low system voltages due to a faulty battery or charging system issues

Diagnosis

  1. Record all fault codes and freeze frame data
  2. Check for low fuel pressure related codes and address them if present
  3. Determine whether the system is constant-pressure or returnless
  4. Inspect wiring, connectors, and ground connections

Fixes

  • Replace damaged wiring, connectors, or faulty relay

FAQ

What does P0627 mean?

P0627 indicates an open circuit fault in the fuel pump control circuit.

How do I diagnose P0627?

Diagnose by checking wiring, connectors, ground connections, and possibly replacing a faulty relay or sensor.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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