What Does U0106 Mean?
Communication between the powertrain control module and glow plug control module has been lost. This affects diesel engine cold-start capability and emissions.
Common Causes
35%
Corroded or damaged wiring/connectors to glow plug module
30%
Failed glow plug control module
20%
CAN bus network communication fault
10%
Power supply or ground circuit failure to glow plug module
5%
Module software error or incorrect calibration
Diagnostic Steps
1
Step 1: Check power supply, ground, and fuses to glow plug control module
2
Step 2: Inspect glow plug module connector for corrosion, water damage, or loose pins
3
Step 3: Verify CAN bus signals at glow plug module using multimeter or oscilloscope
4
Step 4: Check for additional network communication codes indicating broader issues
5
Step 5: Test glow plug module functionality or replace if circuits test normal
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
Communication between the powertrain control module and glow plug control module has been lost. This affects diesel engine cold-start capability and emissions.
The most common cause of U0106 (Lost Communication With Glow Plug Control Module) is: Corroded or damaged wiring/connectors to glow plug module
Typical repair costs for U0106 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Diesel engine may be difficult or impossible to start in cold weather. Vehicle may be stranded in cold conditions, presenting safety risk.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0106 to identify the root cause.
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Quick Info
Category
Network
System
Diesel Engine Starting / Network Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
