U2139 — Engine control module (ECM)/steering column function control module - communication error

Manufacturer reference family

GM: U2139

Engine control module (ECM)/steering column function control module - communication error

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 U2139 mean?

Engine control module (ECM)/steering column function control module - communication error. 1 reference families define this identifier: GM.

Is U2139 a generic or manufacturer-specific code?

Check the reference scope shown above for this identifier.

Can U2139 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.