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P1C1700 — Expansion valve for evaporator, passenger compartment (EXV3) – no communication
Expansion valve for evaporator, passenger compartment (EXV3) – no communication. 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 P1C1700
How to read and clear P1C1700
- 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 P1C1700 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
| P1C1100 | Expansion valve for evaporator, passenger compartment (EXV3) - fault |
| P1C1200 | Expansion valve for evaporator, passenger compartment (EXV3) – mechanical fault |
| P1C1300 | Expansion valve for evaporator, passenger compartment (EXV3) – temperature too high |
| P1C1400 | Expansion valve for evaporator, passenger compartment (EXV3) – voltage too high |
| P1C1500 | Expansion valve for evaporator, passenger compartment (EXV3) – voltage too low |
| P1C1600 | Expansion valve for evaporator, passenger compartment (EXV3) – signal implausible |
| P1C1800 | Expansion valve for evaporator, passenger compartment (EXV3) – not taught |
| P1C1900 | Refrigerant cut-off valve 1, Faulty |
| P1C1A00 | Refrigerant shut-off valve 1 – mechanical fault |
| P1C1B00 | Shutoff valve 1 for refrigerant – overtemperature |
| P1C1C00 | Refrigerant cut-off valve 1, Excess voltage |
| P1C1D00 | Shutoff valve 1 for refrigerant – undervoltage |
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.