The driver door module lost LIN communication with a door module
What it means
B1087. The driver door module lost LIN communication with a door module. Power windows, locks and switch lights on that door stop working.
Findings, check these first
- Open in the LIN bus wiring between the driver door module and the door module
- Short in the LIN bus circuit
- Faulty window control switch on the affected door
- Faulty driver or passenger door module
- Poor connector at a door module
Standard procedure
- Confirm the code and test the power windows and locks on the affected door
- Inspect the door module connectors and LIN wiring
- Check the LIN bus for an open or short
- Test the window control switch
- Replace the door module only after the switch and wiring test clean
- Clear the code and retest to confirm the LIN communication returns
Code lookup
Type a code above, or start from a symptom or a common code.
Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.
Sources and review
Review: checked against the recorded source material.
- B1087 FORD: Code Meaning, Causes, Symptoms, & Tech Notes | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity, Ford meaning and possible causes
Fetched directly. Ford title, meaning and causes match the catalog record. Model and year fitment remain curator claims.
- B1087 FORD Door Module LIN Bus 'A' | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Ford meaning and causes
Same Ford text as the engine-codes page (both sites share one publisher).
Last updated 2026-10-10.
Report a correction for B1087. Include your vehicle, the issue and a source if you have one.