Powertrain, generic · Transmission

P08B5 Clutch Pedal Position Sensor B Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P08B5 covers a second clutch pedal sensor whose signal lies within its electrical limits but is implausible on its own, for example stuck at one value while the pedal moves or not matching the driving state. No manufacturer documents this code publicly. Ford's dual PWM pedal sensor layout files any disagreement between the two channels under P08B9 rather than a B-only plausibility code, and GM applies the comparable in-gear plausibility check only to sensor A (P08A8: error above 4 % while a gear is engaged). CARB requires plausibility monitoring for inputs used by other diagnostics. If a manufacturer uses it, expect start-stop to be disabled; the clutch itself keeps working because it is hydraulically operated.

Likely causes

Sensor B drifting or worn so its value no longer follows pedal travel
Sensor loose or misaligned on the pedal bracket
Corrosion adding resistance in the sensor B circuit

Symptoms

  • Warning lamp on
  • Start-stop or cruise control unavailable

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–350
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

clutch pedal position sensor bwiring harnessecm

Related codes

P08B4P08B6P08B7P08B9P08A8

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.