OBD Guide
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C168B

AVC-LAN Communication Malfunction

C168B is an OBD-II diagnostic trouble code meaning: AVC-LAN Communication Malfunction. Common causes: break or short circuit in the avc-lan bus wiring, oxidation of connectors in the avc-lan circuit. Estimated repair cost: $22–222.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–222 (est.)

Symptoms

  • Errors in the operation of the multimedia system
  • Lost communication between audio system and navigation
  • Incorrect display of data on the information display
  • Disabling certain functions of the on-board computer
  • The fault lamp in the audio or multimedia system is on

Causes

  • Break or short circuit in the AVC-LAN bus wiring
  • Oxidation of connectors in the AVC-LAN circuit
  • Malfunction of one of the units connected to the bus
  • Damage to the multimedia head unit
  • Software failure in one of the ECUs on the bus

How to Fix

  1. Read codes from all units with access to AVC-LAN
  2. Inspect the connectors of the multimedia system for signs of oxidation
  3. Check the power and ground of the multimedia head unit
  4. Try rebooting the multimedia system (disconnect and connect the battery)
  5. Check the wiring of the AVC-LAN bus according to the car diagram
  6. Contact your dealer to diagnose and update the firmware of the units

Related codes

C1683C168CU0100U0164

FAQ

What does the C168B code mean?

C168B is an OBD-II diagnostic trouble code that indicates: AVC-LAN Communication Malfunction

What causes a C168B error code?

The most common causes of C168B include: Break or short circuit in the AVC-LAN bus wiring; Oxidation of connectors in the AVC-LAN circuit; Malfunction of one of the units connected to the bus; Damage to the multimedia head unit.

How do I fix a C168B diagnostic trouble code?

To fix C168B: Read codes from all units with access to AVC-LAN. Inspect the connectors of the multimedia system for signs of oxidation. Check the power and ground of the multimedia head unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C168B?

Do not drive — repair immediately

How much does it cost to fix C168B?

The estimated repair cost for C168B is $22–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat