U3003
3 owner reports and 98 manufacturer filings across 32 model years from Ford, Honda, Lincoln, Mazda.
Where U3003 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2020 Ford F-250 Super Duty | Electrical System | 7 | — |
| 2020 Ford F-350 Super Duty | Electrical System | 7 | — |
| 2021 Ford F-250 Super Duty | Electrical System | 6 | — |
| 2021 Ford F-350 Super Duty | Electrical System | 6 | — |
| 2020 Ford F-450 Super Duty | Electrical System | 6 | — |
| 2022 Ford F-250 Super Duty | Electrical System | 5 | — |
| 2022 Ford F-350 Super Duty | Electrical System | 5 | — |
| 2021 Ford F-450 Super Duty | Electrical System | 5 | — |
| 2016 Mazda CX-9 | Structure | 5 | — |
| 2022 Ford Escape | Electrical System | 4 | — |
| 2022 Ford F-450 Super Duty | Electrical System | 4 | — |
| 2021 Ford Escape | Electrical System | 3 | — |
| 2020 Ford Escape | Electrical System | 3 | — |
| 2023 Ford Maverick | Electrical System | 3 | — |
| 2022 Ford Maverick | Engine And Engine Cooling | 3 | — |
| 2022 Lincoln Corsair | Electrical System | 3 | — |
| 2021 Lincoln Corsair | Electrical System | 3 | — |
| 2023 Ford Escape | Hybrid Propulsion System | 2 | — |
| 2016 Ford Fiesta | Power Train | 2 | — |
| 2019 Ford Transit Connect | Steering | 2 | — |
| 2023 Lincoln Corsair | Hybrid Propulsion System | 2 | — |
| 2017 Mazda CX-5 | Structure | 2 | — |
| 2018 Mazda CX-9 | Structure | 2 | — |
| 2017 Mazda CX-9 | Structure | 2 | — |
| 2018 Mazda Mazda3 | Forward Collision Avoidance | — | 2 |
| 2026 Ford Explorer | Electrical System | 1 | — |
| 2018 Honda CR-V | Electrical System | — | 1 |
| 2026 Lincoln Aviator | Electrical System | 1 | — |
| 2021 Mazda CX-5 | Electrical System | 1 | — |
| 2021 Mazda CX-9 | Electrical System | 1 | — |
| 2020 Mazda CX-9 | Electrical System | 1 | — |
| 2019 Mazda CX-9 | Electrical System | 1 | — |
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.
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.
The contact had taken the vehicle to a non-manufacturer dealer who used a handheld scanner and retrieved the following codes: C1001 Type 97, U3003, and B13D3
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names U3003. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.
- SSM 548822026-05-29 · Electrical System
- Some 2025-2026 Explorer/Aviator vehicles may exhibit a no crank/no start/discharged battery condition with diagnostic trouble codes (DTC) B144D:29, B144E:29, B1555:29, B1556:29 and/or U3003:16 stored in the rear gate trunk module (RGTM). The power liftgate may also be inoperative. This may be due to water intrusion into the left and/or right power liftgate motors caused by a loose grommet on the e
- SSM 522012024-01-24 · Electrical System
- Some 2020-2023 Escape, 2021-2023 Corsair vehicles equipped with 2.5L engine full hybrid electric vehicle (FHEV) and plug-in hybrid electric vehicle (PHEV) powertrain and 2022-2023 Maverick vehicles equipped with 2.5L engine FHEV powertrain may exhibit a condition where the 12V battery voltage is low or discharged with diagnostic trouble code (DTC) U3003:62 stored in the direct current/direct curre
- SSM 520242023-10-27 · Hybrid Propulsion System
- Some 2020-2023 Escape/2021-2023 Corsair equipped with 2.5L engine full hybrid electric vehicle (FHEV) and plug-in hybrid electric vehicle (PHEV) powertrain and 2022-2023 Maverick vehicles equipped with 2.5L engine FHEV powertrain may exhibit a condition where the 12V battery voltage is low or discharged with diagnostic trouble code (DTC) U3003:62 stored in the direct current/direct current convert
- SSM 515982023-05-04 · Electrical System
- Some 2020-2023 Escape/Corsair equipped with 2.5L engine full hybrid electric vehicle (FHEV) and plug-in hybrid electric vehicle (PHEV) powertrain and 2022-2023 Maverick vehicles equipped with 2.5L engine FHEV powertrain may exhibit a condition where the 12V battery voltage is low or discharged with diagnostic trouble code (DTC) U3003:62 stored in the direct current/direct current converter control
- TSB 22-24432022-11-18 · Equipment — Electrical
- This article supersedes TSB 22-2313 to update the Parts List, Service Procedure, and vehicle production fix dates. Some 2020-2022 F-Super Duty vehicles may exhibit a condition where the engine will not turn off and/or have various electrical symptoms including a dead battery, horn stays on and no crank/no start. The vehicle may also have an illuminated anti-lock braking system (ABS) indicator with
- TSB 22-23132022-08-05 · Electrical System
- This article supersedes TSB 22-2044 to update the Parts List. Some 2020-2022 F-Super Duty vehicles built on or before 18-Mar-2022 may exhibit a condition where the engine will not turn off and/or have various electrical symptoms including a dead battery, horn stays on and no crank/no start. The vehicle may also have an illuminated anti-lock braking system (ABS) indicator with diagnostic trouble co
What U3003 means
Source: SAE J2012 / OBD-IIU3003 is a manufacturer-specific code: the second character is a 3, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.
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 U3003
Source: NHTSA files and the OBD-II standardWhy does this page not define U3003?
Because it cannot be defined honestly. The second character of a trouble code says who owns its meaning, and a 1 or a 3 hands that to the manufacturer. Sites that print one definition for a manufacturer-specific code are showing you one automaker's meaning and hoping it is yours.
Can I keep driving with U3003 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.