U0106 moderate

Lost Communication With Glow Plug Control Module

The U0106 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Glow Plug Control Module. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$100 - $600 (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
  • Glow plug indicator stays on or does not illuminate
  • Hard starting in cold weather
  • White smoke on cold start

Probable Causes (Ranked by Likelihood)

  • Failed glow plug control module Very High
  • CAN bus wiring fault to glow plug module High
  • Corroded module connector Moderate
  • Module power supply loss Low

Step-by-Step Diagnostic Procedure

  1. Check glow plug module power and ground

  2. Inspect module connector for corrosion

  3. Verify CAN bus wiring to the module

  4. Check glow plug operation manually

  5. Replace glow plug module if communication cannot be restored

Frequently Asked Questions

Can I drive with code U0106?

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 U0106?

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

Is U0106 expensive to fix?

Repair costs range from $100 - $600 (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.

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