P2D25Turbocharger Interstage Pressure Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2D25 is set when the interstage pressure signal jumps or drops out faster than any real pressure between two turbo stages could change, typically through brief interruptions in the circuit. No manufacturer documents the code or its rate limit publicly. The sensor matters because GM's two-stage control patent feeds the measured mid-stage pressure back to the low-pressure wastegate loop, so spikes can make that loop hunt. California requires input sensors to be monitored for faults, and the boost system for slow response. Vibration and heat near the turbochargers make loose terminals and cracked insulation the leading suspects; a wiggle test while watching live data usually finds them.
- What you may notice
- Check engine light that comes and goes
- Surging or hunting boost
- Brief power loss over bumps
- Likely causes
- LikelyLoose or spread terminal in the sensor plug
- PossibleHeat-cracked insulation causing brief shorts
- PossibleMoisture or oil in the connector
- RareSensor with intermittent internal contact
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.