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U18B4 Cadillac Code - Lost Communication With Radio On Ethernet Bus

- Code Popularity: 754 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 Cadillac Possible Causes

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

|How do I Fix the Code U18B4 Cadillac?

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 Cadillac have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code U18B4 Cadillac?

Labor: 1.0

The cost of diagnosing the U18B4 Cadillac 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 Cadillac Possible Symptoms?

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

|Code U18B4 Cadillac 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 Cadillac - Lost Communication With Radio On Ethernet Bus -
U18B4 Cadillac Code - Lost Communication With Radio On Ethernet Bus

|Need More Information on the U18B4 Cadillac Code?

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

|Need Help with the U18B4 Cadillac Code?

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

|Code U18B4 Cadillac 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 Cadillac code? Have you replaced any parts?
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