Code Definition

U3003 (62-28) — Battery Voltage

System: Network Communication  |  Type: Manufacturer-Specific  |  Make: Ford

About U3003

U3003 is a manufacturer-specific network communication diagnostic trouble code recorded for Ford vehicles. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

U3003 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC U3003 is a manufacturer specific code set when a control module detects that system battery voltage is outside its calibrated operating range during operation or initialisation. The module monitors its supply voltage and logs this fault when voltage is excessively low, excessively high, or unstable for long enough to affect reliable operation, internal processing, or network communication. It points to a power supply, battery, or charging system problem rather than a sensor or bus fault. When set, multiple modules may log voltage related or communication codes together, and the driver may ...

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