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AutoCodes - Generic - U18B4

U18B4 Code - Lost Communication With Radio On Ethernet Bus

- Code Popularity: 2,739 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By - Updated Jun 08, 2020
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|Code U18B4 Possible Causes

  • Faulty Radio
  • Radio harness is open or shorted
  • Radio circuit poor electrical connection

|How do I Fix the Code U18B4?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your Car have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code U18B4?

Labor: 1.0

The cost of diagnosing the U18B4 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|What are Code U18B4 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|Code U18B4 Description

At the core of the infotainment system is the Radio Ethernet Audio Video Bridging switch which communicates directly to each contributing Infotainment control module terminator. The Ethernet harness consists of twisted pair wires from point to point. Each control module on the Ethernet infotainment system sends/receives data at 100 Mbit/s to/from a specified port at the Radio. The Radio Ethernet will also be used to program USB software update files to the control modules connected to the Ethernet ports. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18B4 - Lost Communication With Radio On Ethernet Bus -
U18B4 Code - Lost Communication With Radio On Ethernet Bus

|Need More Information on the U18B4 Code?

Need more information on how to fix the U18B4 code? Get Access to Factory Service Manuals

|Information for Specific Makes

|Need Help with the U18B4 Code?

Get the U18B4 code diagnosed by a professional: Find a repair shop in your area

|Code U18B4 comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U18B4 code? Have you replaced any parts?
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