P2644 – A Rocker Arm Actuator Control Circuit Open

Description

The ECM detects an open circuit in the rocker arm actuator control circuit.

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Symptoms

  • Hard starting
  • Rough idle
  • Check engine light

Causes

  • Open wiring
  • Faulty actuator
  • ECM fault

Diagnosis

  • Inspect wiring
  • Test actuator
  • Check ECM

Repair

  • Repair wiring
  • Replace actuator