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Diagnostic knowledge / U183E — Lost Communication with OnStar Module on Low Speed Communication Bus
U183E

Lost Communication with OnStar Module on Low Speed Communication Bus

U183E is described as “Lost Communication with OnStar Module on Low Speed Communication Bus” in the GM reference.

Some scan tools (for example GM and Ford dealer tools) display this code with a failure-type suffix, such as U183E-00 or U183E:00; the base code U183E is the same.

Manufacturer reference family

GM: U183E

en

Lost Communication with OnStar Module on Low Speed Communication Bus

Reference namespace
gm
Source revision
legacy-oem-dtc-r2-20260924

Reference family assigned by the production catalog. An entry in this family is not proof of a fault or ECU support on every listed vehicle.

What should I check before using this definition?

Keep the full code, module, status and freeze-frame data. Confirm the vehicle’s make, model, year and current manufacturer service information before choosing a repair. This entry does not identify a failed part by itself.

Organize a scan report or recording
Source and applicability

OBD Lens production library legacy-owner-2026-11-02-v84-evidence. This is a scoped technical reference, not a scan of your car. A catalog relationship does not certify that every ECU, year or engine returns the same signal or code definition.

Read the reference method

What does U183E mean?

Lost Communication with OnStar Module on Low Speed Communication Bus. 1 reference families define this identifier: GM.

Is U183E a generic or manufacturer-specific code?

Check the reference scope shown above for this identifier.

Can U183E tell me which part has failed?

This entry does not identify a failed part by itself. Confirm the vehicle’s make, model, year and current manufacturer service information before choosing a repair.

OBD Lens reference library · catalog legacy-owner-2026-11-02-v84-evidence. Sources and scope