OBD Guide
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U18B3

Lost Communications With Navigation Control Module On Ethernet Bus

U18B3 is an OBD-II diagnostic trouble code meaning: Lost Communications With Navigation Control Module On Ethernet Bus. Common causes: broken or damaged ethernet wires, navigation module malfunction. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Navigation system does not work
  • No connection to multimedia functions
  • Error message on display
  • Navigation is intermittent
  • Infotainment system freezes

Causes

  • Broken or damaged Ethernet wires
  • Navigation module malfunction
  • Problems with connectors
  • Software glitch
  • Module power problems

How to Fix

  1. Check the integrity of the Ethernet wiring
  2. Inspect connectors for oxidation
  3. Check the power supply of the navigation module
  4. Update system software
  5. Replacing the navigation module if necessary

Related codes

U18B2U18B4U18B5

FAQ

What does the U18B3 code mean?

U18B3 is an OBD-II diagnostic trouble code that indicates: Lost Communications With Navigation Control Module On Ethernet Bus

What causes a U18B3 error code?

The most common causes of U18B3 include: Broken or damaged Ethernet wires; Navigation module malfunction; Problems with connectors; Software glitch.

How do I fix a U18B3 diagnostic trouble code?

To fix U18B3: Check the integrity of the Ethernet wiring. Inspect connectors for oxidation. Check the power supply of the navigation module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U18B3?

Yes, but get it checked soon

How much does it cost to fix U18B3?

The estimated repair cost for U18B3 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat