Code Definition

B1A56 (15) — 2F Antenna Circuit

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

About B1A56

B1A56 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1A56 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1A56 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 Passive Anti Theft System (PATS) or Keyless Vehicle Module (KVM) monitors the low frequency antenna circuits used to detect the key fob during passive entry and passive start authorisation. DTC B1A56:15 is logged when the module detects an open circuit condition on the 2F antenna driver circuit, meaning the expected current flow through the antenna coil is not present when the module attempts to energise it. The 2F antenna is one of several internal and external LF antennas the module uses to locate the key fob position around the vehicle, allowing it to confirm the fob is inside or close ...

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