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P1E9100 — Electric interior heater (Z189), coolant output temperature implausible
Electric interior heater (Z189), coolant output temperature implausible. 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 P1E9100
How to read and clear P1E9100
- 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 P1E9100 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
| P1CE000 | Expansion valve for evaporator, passenger compartment (EXV3) – mechanical fault |
| P1CE500 | Servo motor for cooling-air flaps, right (SM1) – temperature implausible |
| P1CE600 | Servo motor for cooling-air flaps, left (SM2) – temperature implausible |
| P1CE800 | High-voltage battery coolant outlet temperature sensor, temperature implausible |
| P1CE900 | High-voltage battery coolant inlet temperature sensor, temperature implausible |
| P1E8A00 | Electric interior heater (Z189), coolant input temperature implausible |
| P218200 | Temperature sensor for high-temperature circuit (TW11) – open circuit |
| P218300 | Temperature sensor for high-temperature circuit (TW11) – signal implausible |
| P218400 | Temperature sensor for high-temperature circuit (TW11) – short circuit to ground |
| P218500 | Temperature sensor for high-temperature circuit (TW11) – short circuit to B+ |
| P251500 | Refrigerant circuit sensor on low pressure side (PT2) – fault |
| P251600 | Refrigerant circuit sensor on low pressure side (PT2) – pressure implausible |
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.