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U003800 — Private CAN bus, no communication
Private CAN bus, no communication. 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 U003800
How to read and clear U003800
- 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 U003800 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 Roll Control System
| C141CF2 | Motor for motor pump unit, electric machine, overcurrent |
| C141CF3 | Motor for motor pump unit, left electric machine, overspeed |
| C141CF4 | Motor for motor pump unit, right electric machine, sensor defective |
| C141CF5 | Motor for motor pump unit, right electric machine, overspeed |
| P136C00 | 48V vehicle electrical system, voltage too high |
| P178E00 | Compressor for level control, Temperature too high |
| U006400 | Infotainment CAN bus faulty |
| U045200 | Airbag control unit - signal implausible |
| U101100 | Supply voltage – too low |
| U101200 | Supply voltage – too high |
| U10A900 | Suspension data bus, Faulty |
| U10EC00 | Internal CAN, Implausible signal |
All 81 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.