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

P26C4

Internal Control Module Clutch Pedal Performance

The internal clutch pedal interpretation logic in the control module does not match the external clutch switch state. Manual transmission start interlock or stop-start enable can misbehave.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / C4

Possible causes

  • External clutch switch drift medium
  • Signal corruption between switch and ECU medium

Symptoms

  • Check engine or transmission warning light on
  • Harsh, delayed, or missing shifts
  • Possible limp mode (locked in one gear)
  • Slipping or shuddering during gear changes

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 80–400 €
  • Estimated time: 0.5–2 h
  • Component: control module
  • Component: clutch switch
  • 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