P1551 – Cruise Control Vacuum Solenoid Fault (Nissan)

Description

The ECM detected a malfunction in the cruise control vacuum solenoid.

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Symptoms

  • Cruise drops out
  • Weak hold

Causes

  • Solenoid failure
  • Vacuum leak
  • Wiring issue

Diagnosis

  • Test solenoid
  • Inspect vacuum lines
  • Scan cruise data

Repair

  • Replace solenoid
  • Repair vacuum leak

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