P2BFFExhaust Flow Control Valve B Position Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2BFF is the upper limit fault for the position feedback of exhaust flap B. An analog signal pinned near supply voltage, or a PWM feedback stuck near 100 percent, usually comes from a lost sensor ground, a signal wire touching voltage, or water bridging the connector pins. No manufacturer documents P2BFF publicly. Deutz uses the valve A counterpart P2BF7 when its flap voltage is too high, and GM's 23OBDG07 tables fail the second exhaust valve feedback above 98 percent duty cycle after 4 seconds, two trips to the MIL, under a GM-specific code. CARB asks for range checks on inputs of this kind. Unlike P2BFA, which concerns the drive line, this code points at the return signal, so the flap may still move while the computer no longer trusts the reported angle.
- What you may notice
- Check engine light on
- Exhaust mode warning, flap B held in default position
- Likely causes
- LikelyOpen ground at the flap B position sensor
- PossibleWater or salt bridging the actuator B connector pins
- PossibleSignal wire shorted to a voltage source
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.