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B1903F0 — Refrigerant circuit – fill quantity too low
Refrigerant circuit – fill quantity too low. 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 B1903F0
How to read and clear B1903F0
- 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 B1903F0 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 Central Electrics
| B185111 | Button for instrument panel vents, Short circuit to ground |
| B185129 | Button for instrument panel vents, Implausible signal |
| B185215 | Indicator light for instrument panel vents, Open circuit/short circuit to B+ |
| B189E04 | Right ambient light, rear cupholder, front center console (AL4) – defective |
| B189F04 | Left ambient light, rear cupholder in front center console (AL5) – defective |
| B18D3F4 | Function activation – authentication failed |
| B191029 | Button for raising level control – signal implausible |
| B191129 | Button for lowering level control – implausible signal |
| B191207 | Button for sunroof/tilt roof, mechanical malfunction |
| B191229 | Button for sunroof/tilt roof, Implausible signal |
| B191307 | Button for sunroof/tilt roof, rear, mechanical malfunction |
| B191329 | Button for sunroof/tilt roof, rear, Implausible signal |
All 1472 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.