Code Definition

B15CC — Auxiliary (Backup) Battery Disconnected

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

About B15CC

B15CC is a manufacturer-specific body diagnostic trouble code recorded for Toyota 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.

B15CC 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 Data Communication Module (DCM, also called the telematics ECU) monitors the internal backup auxiliary battery pack via a dedicated sense line and measured pack voltage. DTC B15CC is stored when, with the ignition on or the DCM awake, the module detects an open or disconnected condition on the backup battery circuit, or a voltage below the calibrated presence threshold for a specified time. The backup battery is a small rechargeable cell pack that allows the DCM to power the cellular modem and place an emergency call after a collision even if the main vehicle battery has been damaged or di...

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