Powertrain, generic (extended)

P2D17 Exhaust Flow Control Valve C Position Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2D17 is the catch-all fault for the return signal by which actuator C reports its angle to the engine computer. The signal is missing or unusable, yet it does not fit the clear low or high pattern of P2D19 and P2D1A. The code can only appear where a third flap with its own position output exists. No manufacturer documents P2D17. GM's 23OBDG07 tables illustrate how such returns are supervised: for each of two exhaust valves the period and duty cycle of the PWM signal are read and judged over 4 seconds, under GM codes. Ford reads the state of its two flaps over the PWM line of the smart driver. CARB rules call for circuit checks on such inputs. Begin at connector, pins and ground of actuator C, and compare with the other flaps, which are usually of identical design.

Likely causes

Corroded or loose connector on actuator C
Damaged feedback or ground wire near the exhaust
Failed position sensor inside the actuator

Symptoms

  • Check engine light
  • Flap C held in a default position by the control unit
  • Sound modes partly unavailable

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–900
Time0.5–2.5 h

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

Parts involved

exhaust flow control valve cwiring harnessecm

Related codes

P2D18P2D19P2D1AP2D13P2BFC

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