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P26F400 — Coolant pump (P8, P3), open circuit
Coolant pump (P8, P3), 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 P26F400
How to read and clear P26F400
- 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 P26F400 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
| P266F00 | Refrigerant circuit shut-off valve (EAV2) – temperature too high |
| P268100 | Coolant bypass valve – open circuit |
| P268200 | Coolant bypass valve – short circuit to ground |
| P268300 | Coolant bypass valve – short circuit to B+ |
| P26AB00 | Coolant bypass valve – stuck open |
| P26B100 | Coolant bypass valve – blocked in closed position |
| P26F500 | Coolant pump (P8, P3), short circuit to ground or open circuit |
| P26F600 | Coolant pump (P8, P3), short circuit to B+ |
| P26F800 | Coolant pump (P8) – blocked |
| P26F900 | Coolant pump (P8, P3), temperature too high |
| P26FA00 | Coolant pump (P8, P3), dry run |
| P26FD00 | Electric air-conditioning compressor (V470) - control unit, error |
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.