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P278A Powertrain

Kick Down Switch Circuit

The kick-down switch (under the accelerator pedal at full travel) circuit is faulty. The transmission cannot detect the driver's full-throttle downshift request.

Affected components

  • Kickdown switch
  • Accelerator pedal
  • Wiring harness

Common causes

  • High likelihood: Switch contacts worn or corroded
  • Medium likelihood: Broken wire to switch

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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