P2D16Exhaust Flow Control Valve C Control 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
- P2D16 covers the case where flap C passes every wiring test but still fails to follow its command: it moves too slowly, stops short of the target or drifts away from it. No manufacturer documents valve C codes publicly. Ford's handling of its A and B flaps shows the idea. The actuator electronics flag a jammed flap through the PWM return line, and a plausibility test sets the measured against the requested angle. The 2020-2023 summary lumps both under control performance; the 2024 edition breaks them down into subtypes 07 for a mechanical fault, 4B for an overheated actuator and 78 for failed alignment. In bulletin 23-2132 the Mustang flap is driven open and shut in 10 percent steps to locate the problem. Soot or rust on the shaft, a seized bearing, a bent silencer or a tired motor are typical; CARB asks for such functional checks.
- What you may notice
- MIL on, possibly with an exhaust mode warning
- Rattle or buzzing from the flap area
- Exhaust sound no longer matches the selected mode
- Likely causes
- LikelyFlap shaft seized by soot or corrosion
- PossibleWorn or overheated actuator motor or gearbox
- PossibleSilencer or actuator bracket misaligned after exhaust work
- RareActuator not aligned after replacement
- 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.