U3003 on Ford
Battery Voltage
U3003 on Ford vehicles indicates battery voltage. Au7o has documented this code across 3 Ford models — most commonly on Bronco, Bronco Sport, Explorer. U3003 is a generic code meaning a control module detected that its supply (battery/system) voltage was outside its normal operating range — either too low or too high. Modules need a stable voltage (roughly 12 to 14.5 volts) to work reliably, and out-of-range voltage can cause erratic module behavior and set this code. It is frequently a symptom of a weak battery or charging-system problem rather than a fault in the module itself. Typical repair costs on Ford range from $100 to $900, depending on the specific model and root cause.
Common Causes of U3003
- •Weak, discharged, or failing battery
- •Faulty alternator / charging system (under- or over-charging)
- •Corroded or loose battery terminals or cables
- •High-resistance ground or power connections
- •Poor module power/ground circuit
- •Excessive parasitic draw
- •Voltage drop from corroded fuse box or connectors
U3003 on Ford by Model
Ford Bronco(1 issue)
- Battery Drain and No-Start from Parasitic Electrical Draw2021-2024
A recurring owner complaint on newer Broncos is unexpected battery discharge after sitting, sometimes leading to a no-start condition, multiple warning messages, or modules behaving erratically. Reports often mention the vehicle being parked for only a few days before the battery is too weak to crank, with some cases linked to software/module sleep issues or accessory loads. The problem is documented in owner forums and complaint databases, though root causes can vary by vehicle.
Ford Bronco Sport(1 issue)
- Loss of Drive Power Due to 12V Battery Detection Failure (Recall 24S24 / NHTSA 24V267)2021-2024
NHTSA recall 24V267000 (Ford reference 24S24) covers 456,565 model year 2021-2024 Bronco Sport and 2022-2023 Maverick vehicles. The Body Control Module and Powertrain Control Module fail to detect 12V battery degradation, resulting in loss of motive power whenever an Auto Stop/Start event occurs or during low-speed braking. Two follow-up campaigns address inadequate initial remedies: 25S02 (NHTSA 25V019, January 2025) replaced defective Camel EFB batteries with Ford AGM units on 272,817 vehicles, and 25S26 (NHTSA 25V158, March 2025) re-fixed 12,833 vehicles previously repaired incorrectly. Dealers reflash control modules and/or replace the battery free of charge.
Ford Explorer(1 issue)
- Parasitic Battery Drain From WiFi/APIM and Accessory Modules Causing Repeated Dead Batteries2016-2020
Owners report repeated dead batteries from a parasitic draw that exceeds Ford's ~50 mA key-off spec; affected Explorers have measured ~200 mA, killing a battery in about three days of sitting. Culprits traced on the forums include the in-vehicle WiFi hotspot/modem module, the APIM (SYNC) module not sleeping, an always-hot USB/media port back-feeding through plugged-in cables, and stuck door/dome circuits. Ford's factory battery is also widely criticized as short-lived (2-3 years), which masks the underlying draw until the battery gives out.
Looking for U3003 on a different make?
View U3003 across all makes →Frequently Asked Questions
What does U3003 mean on Ford?▼
U3003 stands for "Battery Voltage." U3003 is a generic code meaning a control module detected that its supply (battery/system) voltage was outside its normal operating range — either too low or too high. Modules need a stable voltage (roughly 12 to 14.5 volts) to work reliably, and out-of-range voltage can cause erratic module behavior and set this code. It is frequently a symptom of a weak battery or charging-system problem rather than a fault in the module itself. On Ford specifically, this code is documented across 3 models.
What causes U3003 on Ford vehicles?▼
Common causes on Ford: Weak, discharged, or failing battery, Faulty alternator / charging system (under- or over-charging), Corroded or loose battery terminals or cables, High-resistance ground or power connections, Poor module power/ground circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U3003 on a Ford?▼
Repair costs on Ford range from $100 to $900, depending on the specific model and root cause.
Which Ford models have U3003 documented?▼
Au7o has documented U3003 on 3 Ford models: Bronco, Bronco Sport, Explorer.