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P24CF Powertrain

Reductant Tank Cap Switch Circuit Intermittent or Erratic

Same as P24CB with intermittent or erratic signal. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.

Affected components

  • Reductant tank cap switch

Common causes

  • High likelihood: Intermittent contact at connector
  • Low likelihood: Connector with intermittent contact under vibration
  • Low likelihood: Harness routed against vibrating component

Possible symptoms

  • Check engine light or NOx warning on
  • AdBlue/DEF level or quality warning
  • Possible no-start countdown after ignore period
  • Failed emissions inspection (NOx)

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • This code can affect emissions

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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