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B143C4A — Power button (ignition starter switch – part number implausible
Power button (ignition starter switch – part number 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 B143C4A
How to read and clear B143C4A
- 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 B143C4A 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 Comfort System Module
| B143911 | Right rear parking/fog light bulb, Short circuit to ground |
| B143912 | Right rear parking/fog light bulb, Short circuit to B+ |
| B143913 | Right rear parking/fog light bulb, Open circuit |
| B143915 | Right rear parking/fog light bulb, Open circuit/short circuit to B+ |
| B143C04 | Power button (ignition starter switch) – fault |
| B143C29 | Power button (ignition starter switch) – signal implausible |
| B145E11 | Transmission park selector switch, Short circuit to ground |
| B145E29 | Transmission park selector switch, Implausible signal |
| B145F13 | Rear window broken glass sensor – open circuit |
| B146311 | Left brake lamp/fog light/tail lamp bulb, Short circuit to ground |
| B146312 | Left brake lamp/fog light/tail lamp bulb, Short circuit to B+ |
| B146313 | Left brake lamp/fog light/tail lamp bulb, Open circuit |
All 616 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.