P08B9Clutch Pedal Position Sensor A/B Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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).
- What you may notice
- Warning lamp on
- Start-stop disabled
- Cruise control unavailable
- Likely causes
- LikelyOne of the two sensors drifting or worn so the channels no longer agree
- PossibleSticking or misadjusted clutch switch on systems with one sensor plus switches
- PossibleCorroded connector or wiring adding resistance to one channel
- RareSensor assembly or pedal stop misaligned after repairs
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.