P2D17Exhaust Flow Control Valve C Position Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine light
- Flap C held in a default position by the control unit
- Sound modes partly unavailable
- Likely causes
- LikelyCorroded or loose connector on actuator C
- PossibleDamaged feedback or ground wire near the exhaust
- PossibleFailed position sensor inside the actuator
- 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: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.