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C125D16 — Control module for trailer load and trailer nose recognition, Voltage too low
Control module for trailer load and trailer nose recognition, Voltage too low. 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 C125D16
How to read and clear C125D16
- 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 C125D16 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 Trailer Function
| C117916 | Pitch angle sensor, Voltage too low |
| C117917 | Pitch angle sensor, Voltage too high |
| C1179F0 | Pitch angle sensor, Sensor ring faulty |
| C1179F1 | Pitch angle sensor, Supply voltage, short circuit to ground |
| C119613 | Trailer hitch indicator light, Open circuit |
| C125D04 | Control module for trailer load and trailer nose recognition, Faulty |
| C125D17 | Control module for trailer load and trailer nose recognition, Voltage too high |
| C125DF0 | Control module for trailer load and trailer nose recognition, Supply voltage, short circuit to ground |
| C125DF1 | Control module for trailer load and trailer nose recognition, Function restriction |
| C12EE92 | Sensor 1 for trailer load and trailer nose recognition, Malfunction |
| C12F692 | Sensor 2 for trailer load and trailer nose recognition, Malfunction |
| C12F7F0 | Basic setting , trailer load and load protection detection, Malfunction in basic settings |
All 112 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.