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U12B100 — Rear left display-/operating unit control module, No communication
Rear left display-/operating unit control module, No communication. The 911 (992), Panamera (971) 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 U12B100
How to read and clear U12B100
- 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 U12B100 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 MIB2 (Zentralrechner)
| U123300 | Ethernet databus branch 8, No communication |
| U12AB00 | Auxiliary display/control unit 1, No communication |
| U12AC00 | Auxiliary display/control unit 2, No Communication |
| U12AD00 | Charging device 1 for mobile end devices, No communication |
| U12AF00 | Charging device 2 for mobile end devices, No communication |
| U12B000 | Rear right display-/operating unit control module, No communication |
| U12B900 | Control unit for driver assistance systems – missing message |
| U12C800 | MAC address conflict in Ethernet switch branch 1 |
| U12C900 | MAC address conflict in Ethernet switch branch 2 |
| U12CA00 | MAC address conflict in Ethernet switch branch 3 |
| U12CB00 | MAC address conflict in Ethernet switch branch 4 |
| U12CC00 | MAC address conflict in Ethernet switch branch 5 |
All 668 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.