OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P278A

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.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number7 / 8A

Possible causes

  • Switch contacts worn or corroded high
  • Broken wire to switch medium

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 60–400 €
  • Estimated time: 0.3–1.5 h
  • Component: kickdown switch
  • Component: accelerator pedal
  • Component: wiring harness
  • MIL / check engine light

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication