Powertrain, generic · Transmission

P08B9 Clutch Pedal Position Sensor A/B Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P08B9 is stored when two independent measurements of the clutch pedal disagree. Ford uses it in two ways per its 2020–23 gasoline OBD summary: with dual PWM sensors it compares sensor A with sensor B and decides within a second; with a single analog sensor plus two clutch switches it covers an in-range rationality fault or any switch-related mismatch, the switch part being judged over about 40 clutch cycles at different speeds. FCA patented a similar cross-check of the pedal sensor against the clutch interlock switch, which disables electronic stop-start on a mismatch and cannot always tell which part failed. Circuit faults of each sensor have their own codes (P08A9/P08AA, P08B6/P08B7).

Likely causes

One of the two sensors drifting or worn so the channels no longer agree
Sticking or misadjusted clutch switch on systems with one sensor plus switches
Corroded connector or wiring adding resistance to one channel
Sensor assembly or pedal stop misaligned after repairs

Symptoms

  • Warning lamp on
  • Start-stop disabled
  • 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 aclutch pedal position sensor becm

Related codes

P08A8P08B5P08A9P08B6P083FP0704

References: fordservicecontent.com, patents.google.com, law.cornell.edu.