P2BFAExhaust Flow Control Valve B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2BFA reports too high a level on the control line of exhaust flap B. Either the wire has contact with a powered circuit, or the actuator electronics feed voltage back, so the driver cannot pull the line down when it should. Ford's 2024 OBD summary lists it as subtype 12 of the bank 2 check, monitored continuously with a 5 second window. GM's 23OBDG07 tables describe a short to power on the exhaust valve PWM control circuit, enabled above 9 V battery voltage, failing after 4 seconds and lighting the MIL after two trips. Ford bulletin 25-2146 for the 2018-2023 Mustang and 2020-2022 Shelby GT500 groups P2BFA with the other flap codes and directs an inspection of the tailpipe actuator harness. A flap B that keeps moving although commanded otherwise fits this fault better than P2BF9.
- What you may notice
- Check engine light on
- Exhaust mode warning in the cluster
- Bank 2 flap in wrong position for the selected mode
- Likely causes
- LikelyControl wire shorted to a powered circuit
- PossibleFlap B actuator electronics feeding voltage back
- RareDamaged tailpipe actuator harness, Ford service part 14A411
- 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 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.