P26C7Exhaust Flow Control Valve A Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P26C7 is the high-side counterpart: the control line of exhaust valve A carries more voltage than the driver expects, usually because the line touches battery positive or the actuator is damaged. In Ford's 2024 OBD summary it appears as failure type 12 of the valve A check, monitored all the time with a five-second window; the earlier summaries misprint it as P25C7 in their threshold list. Deutz's MD1 list uses it for an exhaust flap whose voltage is too high or shorted. Ford bulletin 25-2146 (Mustang 2018–2023 and Shelby GT500 2020–2022) groups P26C7 with the other flap codes, a lit warning lamp and a mode warning, and directs the technician to inspect the tailpipe actuator and its harness. Unlike P26C6, a high signal can also stem from a wire touching a powered circuit.
- What you may notice
- Check engine lamp on
- Exhaust mode warning in the instrument cluster
- No change in exhaust sound between modes
- Likely causes
- LikelyControl wire shorted to battery voltage or another powered circuit
- PossibleDefective flap actuator electronics
- RareMissing ground at the actuator pulling the line high
- 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.