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.
Manufacturer communications
10Original wording in English
PORSCHE
Reported code forms P242100
Technical information for Malfunction Indicator Light Active/Fault Memory Entry regarding Tank Shut-Off Valve Tank Ventilation System “P242100” or “P242200” in DME Control Unit
PORSCHE
Reported code forms P242100
Technical Information - Malfunction Indicator Light Active / Fault Memory Entry "P242100" or "P242200" in DME Control Unit: Observe Guided Troubleshooting (10 / 25)
VOLKSWAGEN
Reported code forms P2421
Customer states MIL-on, P2421 stored in ECM memory Customer states MIL-on, P2402 stored in ECM memory Customer states rattle from below the vehicle Customer states MIL-on, fault P04F0 stored in ECM memory Customer…
VOLKSWAGEN
Reported code forms P2421
Customer states MIL-on, P2421 stored in ECM memory Customer states MIL-on, P2402 stored in ECM memory Customer states rattle from below the vehicle Customer states MIL-on, fault P04F0 stored in ECM memory Customer…
VOLKSWAGEN
Reported code forms P2421
Customer states MIL-on with P2421 Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states no voice output during calls / micro phone inoperative Customer…
VOLKSWAGEN
Reported code forms P2421
Customer states MIL-on with P0556 Customer states MIL-on with P2421 Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states no voice output during calls /…
Check vehicle applicability
202A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Porsche | CAYENNE | 2025 |
| Porsche | CAYENNE | 2024 |
| Porsche | CAYENNE | 2023 |
| Porsche | CAYENNE | 2022 |
| Porsche | CAYENNE | 2021 |
| Porsche | CAYENNE | 2020 |
| Porsche | CAYENNE | 2019 |
| Porsche | CAYENNE | 2018 |
| Porsche | CAYENNE | 2017 |
| Porsche | CAYENNE COUPE | 2025 |
| Porsche | CAYENNE COUPE | 2024 |
| Porsche | CAYENNE E-HYBRID | 2025 |
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.
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.