P2D1AExhaust Flow Control Valve C Position Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2D1A flags an angle feedback from actuator C that sits above the top of its permitted band: an analog line close to the supply level, or a PWM return hanging near full duty. Typical reasons are a broken sensor ground, a feedback wire chafed against a live conductor, or water creeping between the connector contacts. Because an input without ground drifts up to the pull-up voltage, an open ground shows up as a high reading. No manufacturer documents P2D1A publicly. On MD1 engines Deutz logs P2BF7, the valve A twin, for excessive flap voltage or a short to positive, while GM in its 23OBDG07 tables rejects an exhaust valve return above 98 percent duty once it lasts 4 seconds, with a two-trip MIL under a GM code. In contrast to P2D15, which concerns the drive wire, the flap itself can keep moving here.
- What you may notice
- MIL on
- Control unit ignores flap C feedback and stops adjusting it
- Exhaust sound stuck in one mode
- Likely causes
- LikelyOpen or corroded sensor ground
- PossibleFeedback wire touching a voltage-carrying wire
- PossibleMoisture or road salt in the actuator connector
- RarePosition sensor in actuator C failed high
- 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 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.