U0102 moderate

Lost Communication With Transfer Case Control Module

The U0102 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Transfer Case Control Module. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$100 - $800 (parts and labor)
Diagnose CAN Bus Issues
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Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.

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Common Symptoms

  • Check Engine Light illuminated
  • 4WD/AWD warning light on
  • Cannot shift between 2WD and 4WD
  • Transfer case may default to one mode

Probable Causes (Ranked by Likelihood)

  • Failed transfer case control module Very High
  • CAN bus wiring fault to transfer case module High
  • Corroded connector at transfer case module Moderate
  • Transfer case module power supply loss Moderate

Step-by-Step Diagnostic Procedure

  1. Check transfer case module power and ground

  2. Inspect module connector for corrosion

  3. Check CAN bus wiring to the module

  4. Verify 4WD switch and actuator operation

  5. Replace transfer case module if communication cannot be restored

Frequently Asked Questions

Can I drive with code U0102?

Drive short distances only. Lost communication codes indicate a module has stopped communicating on the vehicle network. The affected system may not function correctly.

What causes U0102?

The most common cause is a failed module or a wiring issue in the CAN bus network. Failed transfer case control module is the most likely cause. Power supply, ground, and connector issues should be checked before replacing any module.

Is U0102 expensive to fix?

Repair costs range from $100 - $800 (parts and labor). Wiring repairs are on the lower end, while module replacement is on the higher end. The module may also need to be programmed after replacement.

Sources

This page is built from documented references. Verify against your own service info before repair work.

U0102 on Diesel, EV & Equipment

The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:

Kubota serious Lost Communication with Transfer Case Module

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