Code Definition

B1157 — Gauge Control Module – Lost Communication with Multiplex Integrated Control Unit (MICU)

System: Body  |  Type: Manufacturer-Specific  |  Make: Honda

About B1157

B1157 is a manufacturer-specific body diagnostic trouble code recorded for Honda vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1157 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

The Gauge Control Module (instrument cluster) communicates with the Multiplex Integrated Control Unit (MICU) via the Honda multiplex communication line to exchange information such as lighting status, door and security signals, and power management data. DTC B1157 is stored when the Gauge Control Module does not receive expected communication from the MICU for a specified period, or when signal integrity is compromised due to loss of data, interruption, or invalid messages on the communication line. The MICU typically resides under the dash and acts as the central multiplex coordinator, distri...

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