P2604 – Coolant Pump Control Circuit Intermittent

Description

The ECM detects intermittent operation in the coolant pump control circuit.

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Symptoms

  • Overheating
  • Reduced power
  • Check engine light

Causes

  • Loose wiring
  • Failing pump motor
  • ECM issue

Diagnosis

  • Inspect wiring
  • Check coolant pump
  • Test ECM

Repair

  • Repair wiring
  • Replace coolant pump