What it means
120308 — Charging pressure control: too low (B58). BeeEmUu groups this code under Turbo & charge air with a severity of Service soon.
120308Provenance
The title and severity above are seeded from the open-research source of record: https://autoexplain.com/what-is-a-turbo-wastegate/. BeeEmUu stores short factual descriptions only; no proprietary ISTA or OEM text is reproduced.
Related schematics
No schematic cross-link is seeded for this code yet. The schematic library holds the CC0 seed diagrams; community links are added over time.
Community repair opinions
No community opinion file exists for this code yet. Add one by opening a PR with community/opinions/120308.toml.
Frequently asked
Is code 120308 safe to clear?
Clearing is only safe once you have read and recorded the freeze frame. Re-appearing after a clear is the useful signal; clearing without recording destroys it.
Is 120308 a BMW-specific or a generic code?
This is a BMW manufacturer hex code. A generic OBD-II tool will not show it — you need BMW-protocol access over K+DCAN or ENET/DoIP.