Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
U140500Terminal 15, Signal Implausible” in Various Control Units (35 / 26)
Manufacturer communications
6Original wording in English
PORSCHE
Technical information for a Malfunction Indicator Light Active / Warning Message All-Wheel Drive Disturbed: Fault Memory Entry “U140500 - Terminal 15, Signal Implausible” in Various Control Units (35 / 26)
AUDI
This bulletin provides information when "Electrical system fault" is displayed in the instrument cluster, DTC: P18F100, P0A1B00, U140500.
AUDI
This bulletin provides instructions for when the message "Electrical system: fault. Please contact workshop" intermittently appears in the instrument cluster accompanied by one or more DTCs U140500, P0A1B00, P18F100.
AUDI
This bulletin provides instructions for when the message "Electrical system: fault. Please contact workshop" intermittently appears in the instrument cluster accompanied by one or more DTCs U140500, P0A1B00, P18F100.
Check vehicle applicability
36A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | Q4 E-TRON ↗ | 2022 |
| Audi | Q4 SPORTBACK E-TRON ↗ | 2022 |
| Audi | Q5 ↗ | 2020 |
| Audi | Q5 ↗ | 2019 |
| Audi | Q5 ↗ | 2018 |
| Audi | Q5 PHEV ↗ | 2021 |
| Porsche | CAYENNE ↗ | 2026 |
| Porsche | CAYENNE ↗ | 2025 |
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.