Code Definition

B129A (88) — LIN Bus D

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

About B129A

B129A 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.

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.

B129A 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), or in some Ford applications the Gateway Module, acts as the LIN master on the LIN Bus D network and supervises communication with the smart slave nodes attached to that bus. LIN Bus D on Ford vehicles typically connects body accessory devices such as door mirrors, seat modules, rain/light sensors, or trailer modules, with the specific population varying by model and trim. DTC B129A:88 is set when the master module detects a communication failure on LIN Bus D, such as missing frames, loss of response from a scheduled slave, or invalid data content in a received m...

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