Code Definition

B3109 — Keyless Entry Transmitter Low Battery

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

About B3109

B3109 is a manufacturer-specific body diagnostic trouble code recorded for Holden vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B3109 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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.

B3109 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 Control Module (BCM) monitors the signal strength and status information transmitted by the keyless entry remote. DTC B3109 is set when the BCM detects a low battery condition within a programmed keyless entry transmitter, based on reduced signal voltage or a low battery status flag embedded in the transmitter data. The remote periodically reports its battery state to the BCM so the system can warn the driver before the remote stops working. When this code is set the remote may operate only at short range or intermittently, eventually failing to lock or unlock the vehicle, and a low k...

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