Home › Fault codes › P1C4400
P1C4400 — Solenoid valve for low-temperature circuit upstream of chiller (UVW1) – open circuit
Solenoid valve for low-temperature circuit upstream of chiller (UVW1) – open circuit. The Taycan, 911 (992), Panamera (971), Panamera (972) and Cayenne report this code; below is which control unit sets it on each model and how to read and clear it.
Which models and control units set P1C4400
How to read and clear P1C4400
- Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
- Open STEUER14, pick your car and run a fault scan: every control unit is read, and P1C4400 shows with its status, its full description and the freeze frame when the unit stores one.
- Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.
More about fault memory in the manual →
Download STEUER14 — free fault readingOther codes of the Thermal Management
| P1C3600 | Refrigerant cut-off valve 4, Implausible signal |
| P1C3A00 | Refrigerant cut-off valve 5, mechanical malfunction |
| P1C3F00 | Refrigerant cut-off valve 5, No signal |
| P1C4100 | Relay for thermal management components (SR6.2) – open circuit |
| P1C4200 | Relay for thermal management components (SR6.2) – short circuit to ground |
| P1C4300 | Relay for thermal management components (SR6.2) – short circuit to B+ |
| P1C4500 | Coolant valve 1 for hybrid/high-voltage battery – short circuit to ground |
| P1C4600 | Coolant valve 1 for hybrid/high-voltage battery – short circuit to B+ |
| P1C4C00 | Coolant change-over valve 2, Excess temp. |
| P1C5100 | Coolant change-over valve 3, Excess temp. |
| P1C5800 | A/C pressure/temperature sensor 1, Implausible signal |
| P1C5900 | Refrigerant circuit sensor on high pressure side (PT1) – faulty |
All 636 codes of this control unit →
Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.