Code Definition

B1101 — Battery Power Supply Malfunction

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

About B1101

B1101 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.

B1101 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

On Subaru vehicles, DTC B1101 is set by a body or chassis control module when it detects that its battery power supply voltage has moved outside the acceptable operating range. The exact module that stores the code varies by model and year and may be the Body Integrated Unit, airbag SRS unit, cruise control module, or transmission control module, each of which monitors its own B+ feed to ensure reliable operation. The code typically sets when the supply drops below roughly 9 volts, rises above roughly 16 volts, or shows rapid fluctuations outside expected tolerance for longer than the allowabl...

Join TaT to view the complete code information and diagnostic details.

Quick Facts