U0284
1 owner report and 275 manufacturer filings across 30 model years from Ford, Lincoln, Subaru, Volkswagen.
Where U0284 shows up
Source: NHTSA manufacturer communications and complaintsA 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.
What it gets filed under
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names U0284. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.
- SSM 539792025-06-25 · Structure — Body
- Some 2024-2025 Ranger vehicles may exhibit a "Check Charging System" message displayed in the instrument panel cluster (IPC) with diagnostic trouble codes (DTC) U012D, U0284, and/or U042E stored in the powertrain control module (PCM). This may be due to corrosion found in the active grille shutter lower connector (C1767). If no corrosion is found in this connector, refer to the Workshop Manual (WS
- SSM 509932022-08-03 · Electrical System
- Some 2022 Maverick vehicles built on or before 4-Apr-2022 equipped with 2.0L engine may exhibit a charging system warning indicator with diagnostic trouble codes (DTCs) U012D, U0284 and/or U042E stored in the powertrain control module (PCM). The vehicle may also exhibit a malfunction indicator lamp (MIL) with DTCs P0036:00 and/or P0138:00 stored in the PCM. This may be caused by water intrusion in
- SSM 509732022-07-29 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
- Some 2022 Maverick vehicles built on or before 4-Apr-2022 equipped with 2.0L engine may exhibit a charging system warning indicator with diagnostic trouble codes (DTCs) U012D, U0284 and/or U042E stored in the powertrain control module (PCM). The vehicle may also exhibit a malfunction indicator lamp (MIL) with DTCs P0036:00 and/or P0138:00 stored in the PCM. This may be caused by water intrusion in
- SSM 499762021-07-23 · Electrical System
- Some 2021 Bronco Sport equipped with a 1.5L EcoBoost engine built on or before 26-Jan-2021 may exhibit a Check Charging System message and/or illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) U012D, U0284 and/or U042E. This may be caused by water intrusion into connector C202. Prior to performing Workshop Manual (WSM) diagnostics, inspect the C202 connector for signs
- SSM 494962021-01-27 · Power Train
- Some 2021 Bronco Sport equipped with a 1.5L EcoBoost engine may exhibit a Check Charging System message and/or illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) U012D, U0284,and/or U042E. This may be caused by water intrusion into connector C202. Prior to performing Workshop Manual (WSM) diagnostics, inspect the C202 connector for signs of corrosion or water residue
- VIN4APIN202008102020-08-10 · Equipment
- Customer states MIL-on with P0496 Customer states MIL-on with U0284 Customer states oil leak from the engine Customer states oil leak from the engine Customer states MIL-on with P0111 Customer states MIL-on with P2407 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states rattle noise from under vehicle
What U0284 means
Source: SAE J2012 / OBD-IIU0284 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 U0284
Source: NHTSA files and the OBD-II standardCan I keep driving with U0284 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light generally means the fault was logged and the vehicle is in a reduced-risk mode; a flashing light means stop soon, because a misfiring engine can destroy a catalytic converter in minutes. 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.