Code Definition

B1844 — Phone Handset Circuit Failure

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

About B1844

B1844 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 B1844 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.

B1844 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 B1844 fault code is set by the Body Control Module (BCM) or integrated phone module on Ford vehicles fitted with a factory cellular telephone or hands free phone system. The module monitors the phone handset cradle and its interface circuitry to detect handset presence, cradle hook switch state, and signal integrity. When the module detects an electrical fault on the phone handset circuit, such as an open feed, short circuit, or invalid handset response, it stores B1844. The driver may notice that the factory phone system is inoperative, that the cradle does not recognise the handset, that...

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