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P2D31

Intake Manifold Tuning Valve Exceeded Learning Limit Bank 1

The required adaptation offset for the intake manifold tuning valve on bank 1 exceeds the calibrated learning window. Mechanism wear or sensor drift beyond compensation.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: medium

Common causes

Ordered by how often each turns out to be the cause.

  • Mechanism worn at end-stopsCommon
  • Position sensor reference driftedPossible

Parts involved

  • Intake Manifold Tuning Valve B1
  • ECM

P2D31 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.