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P278B Powertrain

Kick Down Switch Circuit Range/Performance

The kick-down switch state is implausible against accelerator pedal position. 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

  • Kickdown switch
  • Accelerator pedal

Common causes

  • Medium likelihood: Switch trip point drift
  • Medium likelihood: Accelerator pedal travel out of spec
  • Low likelihood: Sensor element aged beyond calibration window

Diagnostic notes

  • The malfunction indicator lamp may illuminate

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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