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B303B00 — Expansion valve for evaporator, low-temperature circuit (EXV2) – electrical fault
Expansion valve for evaporator, low-temperature circuit (EXV2) – electrical fault. 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 B303B00
How to read and clear B303B00
- 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 B303B00 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
| B1903F0 | Refrigerant circuit – fill quantity too low |
| B1903F1 | Refrigerant circuit – fill quantity too high |
| B1DA5F2 | Low-temperature circuit for high-voltage battery – cooling performance too low |
| B200041 | Ctrl. module faulty |
| B200500 | Coding |
| B201200 | Coding |
| B303D00 | Expansion valve for evaporator, low-temperature circuit (EXV2) – short circuit to B+ |
| B3A0000 | A/C Refrigerant Distribution Valve Actuator "C" Stuck/Open |
| B3A0100 | A/C Refrigerant Distribution Valve Actuator "C" Control, Circuit/Open |
| B3A0200 | A/C Refrigerant Distribution Valve Actuator "C" Control, Circuit Low |
| B3A0300 | A/C Refrigerant Distribution Valve Actuator "C" Control, Circuit High |
| B3A0400 | A/C Refrigerant Distribution Valve "C" Control Circuit Driver, Current/Temperature Too High |
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.