Faulty side obstacle detection control module D, including internal failure or water damage; Damaged or corroded wiring or connectors at the module or along the harness; Poor ground connection for the module or the network; Communication network fault, such as a short or open in the CAN bus wiring; Low battery voltage or charging system issue causing modules to drop offline intermittently; Software or configuration mismatch after battery replacement or module replacement; Aftermarket accessories or improper installation interfering with the network

DTC codes / U05xx · Network communication / U0550

U0550Invalid Data Received From Side Obstacle Detection Control Module D

U0550 means the vehicle's main computer network received invalid or missing data from the side obstacle detection control module D, which is one of the modules responsible for blind spot monitoring or side collision warning. The computer detected that the messages from that module were either absent, corrupted, or outside the expected range, so it flagged the communication fault.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaNetwork communication

Symptoms you may notice

Blind spot warning or side obstacle detection system disabled, often with a message on the dash
Warning light or message indicating a driver assistance system fault
Side obstacle detection indicator lights staying on or flashing
Often no symptoms besides the warning light, with the vehicle driving normally
In some cases, other driver assistance features like rear cross traffic alert may also be inoperative
Intermittent operation of the blind spot monitoring system depending on temperature or vibration

Common causes, most likely first

Faulty side obstacle detection control module D, including internal failure or water damage
Damaged or corroded wiring or connectors at the module or along the harness
Poor ground connection for the module or the network
Communication network fault, such as a short or open in the CAN bus wiring
Low battery voltage or charging system issue causing modules to drop offline intermittently
Software or configuration mismatch after battery replacement or module replacement
Aftermarket accessories or improper installation interfering with the network

How to diagnose and fix it

Verify battery voltage and charging system performance, as low voltage can cause communication faults
Inspect the side obstacle detection control module D connectors and wiring for corrosion, damage, or loose pins
Check the module's ground connection and clean or tighten as needed
Use a scan tool to read all codes and perform a network test to see if other modules also report communication issues
Check for technical service bulletins or software updates for the side obstacle detection system
If wiring and power are good, test the module's communication lines for continuity and shorts
Replace the side obstacle detection control module D if it is confirmed faulty, then perform any required calibration or programming

Before you replace the side obstacle module

A weak battery or failing alternator is a common hidden cause of U-codes because modules may shut down or send corrupted data when voltage drops during cranking.
The side obstacle detection control module D is often one of several modules on the same network, so a single shorted module can take down communication for others and set multiple U-codes.
Water intrusion into the module or connector, especially in areas prone to rain or car washes, can cause intermittent invalid data that may not appear during a quick inspection.
After replacing or disconnecting the module, many vehicles require a calibration drive or a scan tool relearn procedure, and skipping this step can leave the system inoperative even with good parts.
Some aftermarket electronic accessories, such as phone chargers or alarm systems, can introduce electrical noise that interferes with network communication and triggers U0550 without any hard fault.

Can I keep driving with U0550?

The vehicle is generally safe to drive because the side obstacle detection system is a driver aid, not a primary control system, but you should not rely on blind spot monitoring until the fault is repaired. Avoid extended driving with the warning light on if you notice other electrical symptoms, and have the system diagnosed soon to prevent further network issues.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.