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B10121B — Center rear seat belt tensioner igniter, Resistance too high
Center rear seat belt tensioner igniter, Resistance too high. 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 B10121B
How to read and clear B10121B
- 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 B10121B 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 Airbag
| B101153 | Ignition circuit for side airbag on rear driverʼs side - deactivated |
| B101200 | Center rear seat belt tensioner igniter |
| B101201 | Center rear seat belt tensioner igniter, Electrical error |
| B101211 | Center rear seat belt tensioner igniter, Short circuit to ground |
| B101212 | Center rear seat belt tensioner igniter, Short circuit to B+ |
| B10121A | Center rear seat belt tensioner igniter, Resistance too low |
| B101253 | Center rear seat belt tensioner igniter, Deactivated |
| B101300 | Ignition circuit for belt force limiter on front driver’s side - equipment fault |
| B101301 | Ignition circuit for belt force limiter on front driverʼs side - short circuit to other ignition circuit |
| B101311 | Ignition circuit for belt force limiter on front driverʼs side - short circuit to ground |
| B101312 | Ignition circuit for belt force limiter on front driverʼs side - short circuit to B+ |
| B10131A | Ignition circuit for belt force limiter on front driverʼs side - resistance too low |
All 723 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.