P26C6Exhaust Flow Control Valve A Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P26C6 reports that the drive circuit of exhaust valve A sits at too low a voltage – typically because the wiring or the actuator has shorted to ground. Ford's 2024 OBD summary shows that the PCM handles it as failure type 11 of the valve A circuit check, which runs continuously and needs about five seconds; the gasoline summaries 2020–2024 carry a typo here and print P25C6 instead of P26C6 in the threshold table. Deutz lists the same code for its MD1 engines as a low voltage or short on the exhaust flap. Ford bulletin 22-2153 for the Mustang names P26C6 alongside other flap codes and a lit MIL, caused by an exhaust that was not seated correctly. With the circuit pulled low the flap can no longer be commanded; the sister codes P26C5 (open) and P26C7 (high) separate the other fault patterns.
- What you may notice
- Check engine lamp on
- Exhaust mode cannot be changed
- Flap stuck in one position, exhaust permanently quiet or loud
- Likely causes
- LikelyControl wire chafed through against the body or exhaust and shorted to ground
- PossibleInternal short in the flap actuator
- RareWater or road salt in the actuator connector
- 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.