Powertrain, generic (extended)

P2D14 Exhaust Flow Control Valve C Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

With P2D14 the drive wire of flap C is dragged toward ground when the driver expects a higher level. Chafed insulation touching the body or the exhaust, a crushed harness after the car was jacked up, or a shorted actuator winding are the classic reasons. No manufacturer documents P2D14. For the A and B flaps, the Ford 2024 OBD summary handles a ground short as subtype 11 of its smart driver check, run over a 5 second window, and GM's 24OBDG07 tables store P2BF9 for a grounded exhaust valve PWM line after 4 seconds once the supply exceeds 9 V, lighting the MIL on the second trip. CARB wants actuator circuits checked for values outside their range. As the wire is intact but shorted, a continuity test can pass; check the insulation to ground along the whole run instead.

Likely causes

Control wire chafed through and touching ground
Shorted winding or electronics in the valve C actuator
Water or salt bridging pins in the connector

Symptoms

  • MIL on
  • Flap C does not move or stays at its default angle
  • Exhaust louder or quieter than the selected mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–3 h

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

Parts involved

exhaust flow control valve cwiring harnessecm

Related codes

P2D13P2D15P2D16P26C6P2BF9

References: fordservicecontent.com, gsi.ext.gm.com, law.cornell.edu.