P0628 – Fuel Pump Control Circuit Low

Description

The ECM detects a low voltage condition in the fuel pump control circuit.

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Symptoms

  • No start
  • Long crank
  • Stalling

Causes

  • Short to ground
  • Faulty fuel pump relay
  • Wiring issues

Diagnosis

  • Monitor pump control voltage
  • Inspect wiring
  • Check relay

Repair

  • Repair wiring
  • Replace relay
  • Replace fuel pump