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C12B596 — Rear-differential lock control unit – internal fault
Rear-differential lock control unit – internal fault. The Taycan, 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 C12B596
How to read and clear C12B596
- 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 C12B596 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 Lock Electronics
| C11E0F0 | Diff. lock, calibration implausible |
| C12B411 | Temperature sensor for servo motor – short circuit to ground |
| C12B4F0 | Temperature sensor in servo motor – short circuit to B+/open circuit |
| C12B516 | Power supply - below limit value |
| C12B517 | Power supply - above limit value |
| C12B54B | Temperature - above limit value |
| C12B5F0 | Rear-differential lock control unit – forced activation of PSM |
| C12B5F1 | Rear-differential lock control unit – interchange detected |
| C12B5F2 | Rear-differential lock control unit - software error |
| C12B5F6 | Control module, Software incompatible |
| C12B801 | Position sensor 1, Electrical malfunction |
| C12B901 | Position sensor 2, Electrical malfunction |
All 67 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.