Powertrain, generic (extended)

P2D16 Exhaust Flow Control Valve C Control Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Flap shaft seized by soot or corrosion
Worn or overheated actuator motor or gearbox
Silencer or actuator bracket misaligned after exhaust work
Actuator not aligned after replacement

Symptoms

  • MIL on, possibly with an exhaust mode warning
  • Rattle or buzzing from the flap area
  • Exhaust sound no longer matches the selected mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,500
Time0.4–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

exhaust flow control valve cwiring harnessecm

Related codes

P2D13P2D14P2D15P2D18P26FEP2BFB

References: fordservicecontent.com, fordservicecontent.com, static.nhtsa.gov, law.cornell.edu.