Code Definition

B1177 — Abnormal Battery Voltage

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

About B1177

B1177 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.

B1177 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 (GCM) on Honda vehicles monitors the system voltage supplied from the battery and charging system via its internal voltage sensing input. DTC B1177 is set when the detected voltage falls outside the specified operating range for a defined time period, typically below approximately 10.5V or above approximately 16.0V depending on model. Honda gauge modules reference a calibrated internal divider to validate the instrument cluster supply and to keep network communication stable under varying load. When the voltage swings outside the acceptable window the module logs B1177...

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