OBD2DTCOBD-II trouble code reference

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Codes / U3

U3xxx — Network, generic (extended)

Additional generic network and module codes.

Group	Area	Codes
U30xx		55
U35xx		119

Code meanings: OBDex (CC0). Owner complaints: NHTSA (US public domain). Engines: fueleconomy.gov. European model lists: Wikidata (CC0). How the numbers are made.

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Independent reference, not affiliated with any manufacturer. A code describes a fault the control module detected, not a part to replace. Privacy · Updated 2026-11-15