P2004 — Intake Manifold Runner Control Stuck Open Bank 1

P2004: Intake Manifold Runner Control Stuck Open Bank 1 — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Intake Manifold Runner Control Stuck Open Bank 1. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The engine warning lamp may light up and acceleration may feel hesitant.
  • Rough running or increased fuel use is possible, although no change may be felt.

Possible causes

  • Bank 1 intake-runner flaps or linkage may remain open due to deposits or jamming.
  • A faulty actuator, damaged wiring or a vacuum hose problem where fitted may prevent closure.

What to check

  • Scan P2004 and related faults, then inspect the intake-runner mechanism and electrical connections.
  • Inspect fitted vacuum hoses and compare commanded with observed flap movement using the vehicle test procedure.

Also written as: P2004-00, P200400 (some scan tools add the fault-type byte, e.g. -00).