P2BFCExhaust Flow Control Valve B Position Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2BFC covers a general fault in the feedback path that tells the engine computer where exhaust flap B is. It applies only to systems with a second position-monitored flap, such as one per tailpipe, so on single-flap vehicles it cannot occur. No manufacturer documents P2BFC in public material. Ford defines valve B as its bank 2 flap and reads its state through the smart driver's PWM line; GM's 23OBDG07 tables supervise the PWM feedback of two exhaust valves, but under GM-specific codes with duty cycle limits of 2 and 98 percent over 4 seconds. CARB requires circuit monitoring for such inputs. In practice, compare the B side with the A side: if only B fails, look at its connector and wiring first, since the actuators are usually identical.
- What you may notice
- Check engine light on
- Exhaust mode selection limited or unavailable
- Likely causes
- LikelyFlap B connector loose, wet or corroded
- PossibleFeedback wire to flap B broken or heat-damaged
- PossiblePosition sensing in actuator B failed
- 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: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.