Code Definition

B1102 — Battery Power Supply Malfunction

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

About B1102

B1102 is a manufacturer-specific body diagnostic trouble code recorded for Subaru 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.

B1102 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 Body Integrated Unit (BIU) continually monitors its main battery feed voltage to ensure it stays within the manufacturer specified range of roughly 9 volts to 16 volts under all operating conditions. DTC B1102 is set when the BIU detects the battery supply has fallen below the lower threshold, exceeded the upper threshold, or is fluctuating outside tolerance for longer than the allowable detection time. The BIU relies on a stable supply to drive body functions such as interior lighting, central locking, power windows, wiper control, and CAN network gateway duties, so unstable voltage at th...

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