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Diagnostic knowledge / U1523 — (K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 3 (E13R Headlamp Assembly Right)
U1523

(K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 3 (E13R Headlamp Assembly Right)

U1523 is described as “(K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 3 (E13R Headlamp Assembly Right)” in the GM reference.

Manufacturer reference family

GM: U1523

en

(K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 3 (E13R Headlamp Assembly Right)

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-2026-10-09-v81. 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

OBD Lens reference library · catalog legacy-owner-2026-10-09-v81. Sources and scope