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B158116 — Electric interior heater – voltage too low
Electric interior heater – voltage 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 B158116
How to read and clear B158116
- 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 B158116 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
| B148521 | LIN bus 2 – not taught |
| B148522 | LIN bus 2 – not taught |
| B158011 | Refrigerant cut-off valve 2, Short circuit to ground |
| B158012 | Shut-off valve 2 for refrigerant, Short circuit to B+ |
| B158013 | Shut-off valve 2 for refrigerant, Open circuit |
| B158104 | Electric interior heater (Z189), faulty |
| B158117 | Electric interior heater – voltage too high |
| B158129 | Electric interior heater – signal implausible |
| B158131 | Electric interior heater – no communication |
| B15814A | Electric interior heater – part number implausible |
| B158192 | Electric interior heater – fault |
| B158198 | Electric interior heater, 12 V electronics – 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.