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P0619

Alternative Fuel Control Module RAM and ROM Error

The alternative fuel control module reports an internal RAM or ROM check failure - module no longer trustworthy.

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

Symptoms

  • Check engine light on
  • Possible limp mode or no-start
  • Multiple follow-up faults across modules
  • Reset/relearn may be needed after repair

Common causes

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

  • Module internal memory faultCommon
  • Module software outdated, reflash may resolveLess likely
  • Supply voltage outside specificationLess likely

Parts involved

  • Alternative Fuel Control Module

P0619 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.