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U100300 — Trailer hitch control unit - no communication
Trailer hitch control unit - 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 U100300
How to read and clear U100300
- 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 U100300 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 Engine Control Module 1
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| U059300 | High-voltage power electronics control unit, front axle - signal implausible |
| U059900 | Control unit for high-voltage voltage converter (combi converter) - signal implausible |
| U059C00 | High-voltage power electronics 3 control unit – signal implausible |
| U100800 | Check gateway control unit fault memory content |
| U101700 | Check PSM control unit fault memory content |
| U103000 | LIN bus 1 – electrical fault |
| U103F00 | Brake booster control unit - signal implausible |
| U104000 | Rear-differential lock control unit - signal implausible |
| U104100 | Rear-differential lock control unit - signal implausible |
All 274 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.