P0629 – Fuel Pump Control Circuit High

Description

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

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Symptoms

  • Poor fuel economy
  • Rich condition
  • Hard starting

Causes

  • Open circuit
  • Faulty relay
  • Wiring issues

Diagnosis

  • Monitor pump control voltage
  • Inspect wiring
  • Check relay

Repair

  • Repair wiring
  • Replace relay

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