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U042100 — Control unit for chassis control (PASM) – signal implausible
Control unit for chassis control (PASM) – signal implausible. 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 U042100
How to read and clear U042100
- 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 U042100 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
| U041100 | High-voltage power electronics control unit – signal implausible |
| U041300 | High-voltage battery control unit, signal implausible |
| U041500 | Control unit for brake electronics (PSM) – signal implausible |
| U041600 | Data bus - fault value received |
| U041800 | Control unit for brake electronics (PSM) – signal implausible |
| U041900 | Power steering control unit – signal implausible |
| U042200 | Front-end electronics control unit (BCM1) - signal implausible |
| U042300 | Instrument cluster control unit – signal implausible |
| U042900 | Steering wheel electronics control unit - signal implausible |
| U043100 | Data bus - fault value received |
| U043300 | Data bus - message implausible |
| U043D00 | Accelerator pedal sensor defective |
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.