AutoCodes - Generic - U18B4

U18B4 Code - Lost Communication With Radio On Ethernet Bus

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U18B4 code possible causes

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

|How do I fix the U18B4 code?

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.

|Cost of diagnosing the U18B4 code

Labor: 1.0

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

|What are U18B4 code possible symptoms?

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

|U18B4 code 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 - AutoCodes.com

|Need more information with the U18B4 code?

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|U18B4 code information for specific makes

|Need help with a U18B4 code?

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|U18B4 code comments

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