P26EFEngine Sound Control B Circuit Performance
- 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
- P26EF is the functional fault of the second sound actuator: wiring checks pass, yet flap or valve B does not reach or report the commanded state in time. No maker documents P26EF publicly. The A-side equivalent P26DE is well described for the Nissan GT-R, where the electric valve on the main muffler was the cause and could be renewed separately after a software check, and Ford monitors its exhaust valves for a stuck flap via the PWM feedback of a smart driver. Those cases suggest the same suspects for B: binding from soot or rust, a seized shaft after long periods in one position, or a worn actuator gearbox. Unlike P26EC to P26EE, measuring voltages rarely finds the fault; a visual and movement check of the flap does.
- What you may notice
- Check engine light
- Sound of the second branch changes late or not at all
- Rattle from the flap housing
- Likely causes
- LikelyFlap B binding due to soot, rust or a seized shaft
- PossibleWorn gearbox or weak motor in actuator B
- RareEvaluation in the module software too sensitive
- 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.