Home › Fault codes › B158F22
B158F22 — Coolant expansion valve, A/C, Upper limit exceeded
Coolant expansion valve, A/C, Upper limit exceeded. 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 B158F22
How to read and clear B158F22
- 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 B158F22 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
| B157911 | Refrigerant cut-off valve 1, Short circuit to ground |
| B157915 | Refrigerant cut-off valve 1, Open circuit/short circuit to B+ |
| B158011 | Refrigerant cut-off valve 2, Short circuit to ground |
| B158015 | Refrigerant cut-off valve 2, Open circuit/short circuit to B+ |
| B158F04 | Coolant expansion valve, A/C, Faulty |
| B158F21 | Coolant expansion valve, A/C, Lower limit not reached |
| B159511 | Left daytime running lamp bulb 2, Short circuit to ground |
| B159515 | Left daytime running lamp bulb 2, Open circuit/short circuit to B+ |
| B159611 | Right daytime running lamp bulb 2, Short circuit to ground |
| B159615 | Right daytime running lamp bulb 2, Open circuit/short circuit to B+ |
| B15B529 | AUTO automatic lights button – signal implausible |
| B15B629 | Marker light button – signal implausible |
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.