P2012 — Intake Manifold Runner Control Circuit Low Bank 2

P2012: Intake Manifold Runner Control Circuit Low Bank 2 — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Intake Manifold Runner Control Circuit Low Bank 2. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The engine fault light may illuminate.
  • Acceleration can feel weaker or uneven, sometimes with no obvious change.

Possible causes

  • Damaged wiring, corroded contacts or an IMRC control actuator fault may cause a low signal on bank 2.
  • Vacuum-line defects where fitted can separately impair runner movement.

What to check

  • Confirm P2012 and visually inspect bank 2 runner-control connectors and wiring.
  • Measure supply and signal against vehicle specifications; check any vacuum hoses and commanded runner operation separately.

Also written as: P2012-00, P201200 (some scan tools add the fault-type byte, e.g. -00).