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P1C5800 — A/C pressure/temperature sensor 1, Implausible signal
A/C pressure/temperature sensor 1, Implausible signal. 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 P1C5800
How to read and clear P1C5800
- 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 P1C5800 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
| P1C4300 | Relay for thermal management components (SR6.2) – short circuit to B+ |
| P1C4400 | Solenoid valve for low-temperature circuit upstream of chiller (UVW1) – open circuit |
| 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. |
| P1C5900 | Refrigerant circuit sensor on high pressure side (PT1) – faulty |
| P1C5B00 | A/C pressure/temperature sensor 2, Implausible signal |
| P1C5C00 | Refrigerant circuit sensor on low pressure side (PT2) – faulty |
| P1C5E00 | Refrigerant circuit sensor on low pressure side (PT3) - signal implausible |
| P1C5F00 | Refrigerant circuit sensor on low pressure side (PT3) – fault |
| P1C6000 | Refrigerant circuit sensor on low pressure side (PT3) – no communication |
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.