OBD Guide
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U18B0

Lost Communications With Instrument Cluster On Ethernet Bus

U18B0 is an OBD-II diagnostic trouble code meaning: Lost Communications With Instrument Cluster On Ethernet Bus. Common causes: open or short circuit in ethernet circuit, dashboard malfunction. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Instruments on the panel do not work or show incorrect data
  • Dashboard backlight goes out
  • Other communication-related errors appear
  • Unstable operation of the infotainment system
  • The Check Engine light may come on

Causes

  • Open or short circuit in Ethernet circuit
  • Dashboard malfunction
  • Problems with the control unit
  • Wiring harness damage
  • Corrosion of contacts in connectors

How to Fix

  1. Check the integrity of the wiring harness and connectors
  2. Check the power and ground of the instrument panel
  3. Scan all modules for other errors
  4. Replace the dashboard if necessary
  5. Update control unit software

Related codes

U18A0U18B1U18B2

FAQ

What does the U18B0 code mean?

U18B0 is an OBD-II diagnostic trouble code that indicates: Lost Communications With Instrument Cluster On Ethernet Bus

What causes a U18B0 error code?

The most common causes of U18B0 include: Open or short circuit in Ethernet circuit; Dashboard malfunction; Problems with the control unit; Wiring harness damage.

How do I fix a U18B0 diagnostic trouble code?

To fix U18B0: Check the integrity of the wiring harness and connectors. Check the power and ground of the instrument panel. Scan all modules for other errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U18B0?

Limited driving only, diagnose soon

How much does it cost to fix U18B0?

The estimated repair cost for U18B0 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat