P2CD4A/C Refrigerant Pressure Sensor A/B Correlation
- Generic OBD-II code · Powertrain
- How the car detects it
- P2CD4 is a plausibility check between two refrigerant pressure sensors that serve one A/C or heat pump circuit: the module flags it when the pair disagrees beyond what the system allows, even though each sensor is electrically fine. Bentley documents the code as P2CD400 in the thermal management ECU (address 00C5) of 2025 Continental GT and GTC models as well as the Flying Spur; campaign ED35 corrects its handling with a software update. In related Audi models, bulletin 87 22 35 shows that one to three combined pressure and temperature sensors sit on the high or low side of the loop, so A and B are maker-defined positions. No public threshold exists. Circuit faults of each sensor are P0530 ff. and P2515 ff. Expect limited compressor operation or weaker cooling.
- What you may notice
- A/C cools weakly or the compressor is limited
- Code stored in the thermal management or climate module
- Likely causes
- LikelyThermal management software misjudging the sensor comparison (Bentley 2025 campaign)
- PossibleOne pressure sensor drifting or failing internally while still in range
- RareContact resistance at one sensor connector shifting its signal
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.