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P08B9

Clutch Pedal Position Sensor A/B Correlation

The signals of clutch pedal position sensors A and B do not correlate within the calibrated tolerance.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: easy

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

Common causes

Ordered by how often each turns out to be the cause.

  • One sensor characteristic driftedCommon
  • Harness incorrectly swappedPossible

Parts involved

  • Clutch Pedal Position Sensor A
  • Clutch Pedal Position Sensor B
  • ECM

P08B9 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.