P2421
4 owner reports and 96 manufacturer filings across 19 model years from Volkswagen.
Where P2421 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2021 Volkswagen Golf / GTI | Electrical System | 12 | — | Battery → |
| 2020 Volkswagen Golf / GTI | Fuel/Propulsion System | 12 | — | Fuel pump → |
| 2018 Volkswagen Golf / GTI | Electrical System | 12 | — | Battery → |
| 2017 Volkswagen Golf / GTI | Electrical System | 12 | — | Battery → |
| 2021 Volkswagen Jetta | Equipment | 6 | — | |
| 2020 Volkswagen Jetta | Engine | 6 | — | |
| 2018 Volkswagen Jetta | Electrical System | 5 | — | Battery → |
| 2017 Volkswagen Jetta | Electrical System | 5 | — | Battery → |
| 2023 Volkswagen Atlas | Electrical System | 4 | — | Battery → |
| 2022 Volkswagen Atlas | Electrical System | 4 | — | Battery → |
| 2022 Volkswagen Taos | Engine | 2 | 2 | |
| 2021 Volkswagen Tiguan | Electrical System | 4 | — | Battery → |
| 2023 Volkswagen Taos | Seats | 2 | 1 | |
| 2023 Volkswagen ID.4 | Seats | 2 | — | |
| 2023 Volkswagen Jetta | Seat Belts | 2 | — | |
| 2022 Volkswagen Jetta | Seat Belts | 2 | — | |
| 2023 Volkswagen Tiguan | Seat Belts | 2 | — | |
| 2022 Volkswagen Tiguan | Engine | 2 | — | |
| 2024 Volkswagen Jetta | Fuel/Propulsion System | — | 1 | Fuel pump → |
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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P2421 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P2421 on that maker’s vehicles.
What it gets filed under
What owners said
Source: NHTSA complaint databaseOwners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.
In September 2022, a Volkswagen dealer documented code P2421 for an EVAP system vent valve stuck open and performed a software update
Upon using an OBD-II code reader, it gave the code: P2421 - EVAP Vent Valve stuck open
96 manufacturer filings name P2421. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P2421.
- VIN4APIN20230912 Service bulletin2023-09-12 · Electrical System — Ignition — Anti-Theft — Immobilizer/Proximity — Key/Sender
- 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 states MIL-on, fault P0461 stored in ECM memory Customer states noise while driving Customer states sun visor is loose/broken Customer states seat memory is inoperative Customer
- VIN4APIN20230824 Service bulletin2023-08-24 · Engine And Engine Cooling — Engine — Engine Control Module (Ecu/Ecm)
- 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 states MIL-on, fault P0456 and/or P0442 stored in ECM memory Customer states sun visor is loose/broken Customer states seat memory is inoperative Customer states key FOB lock/unlo
- VIN4APIN20210121 Service bulletin2021-01-21 · Fuel System, Other
- 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 states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel coming back up filler neck
- VIN4APIN20210114 Service bulletin2021-01-14 · Electrical System
- 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 / micro phone inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel com
- VIN4APIN20210104 Service bulletin2021-01-04 · Electrical System
- 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 / micro phone inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel com
- VIN4APIN20201210 Service bulletin2020-12-10 · Seats
- 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 / micro phone inoperative Customer states seat memory inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or
What P2421 means
Source: SAE J2012 / OBD-IIP2421 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P2421
Source: NHTSA files and the OBD-II standardCan I keep driving with P2421 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.