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P2CDA

Alternative Fuel Tank A Vacuum Insulation Deteriorated

The AFCM detects that the vacuum insulation of alternative fuel tank A has lost effectiveness. Common in cryogenic LNG tanks where loss of vacuum increases boil-off rate.

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

Common causes

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

  • Vacuum loss in tank double-wallCommon
  • Insulation material agedPossible

Parts involved

  • Alt Fuel Tank A
  • Alt Fuel Tank A Insulation

P2CDA 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.