Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer communications
2Original wording in English
FORD, LINCOLN
Some 2025 Expedition/Navigator vehicles may experience a "Cross Traffic Alert/Side Obstacle Detection Fault" message in the instrument panel cluster (IPC) with diagnostic trouble code (DTC) B15D9:78 stored in the SODL and/or DTC B159C:78 stored in the SODR. Before proceeding with normal Workshop Manual (WSM) diagnostics in Secti…
LINCOLN
Some 2024 Nautilus vehicles may exhibit "Blind Spot System Fault" and "Cross Traffic System Fault" displayed in the message center with diagnostic trouble code (DTC) B159C:78 stored in the side obstacle detection control module RH (SODR). If this condition occurs, follow Pinpoint Test M in section 419-04B Side and Rear Vision of…
Check vehicle applicability
3A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ford | EXPEDITION ↗ | 2025 |
| Lincoln | NAUTILUS ↗ | 2024 |
| Lincoln | NAVIGATOR ↗ | 2025 |
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.