What Does U0105 Mean?
The powertrain control module has lost network communication with the fuel injector control module. This affects fuel delivery management and engine operation.
Safety Warning
Engine may run poorly, stall, or fail to start. Critical safety concern if engine dies while driving, especially in traffic or at high speed.
Common Causes
35%
Faulty wiring or connectors between fuel injector module and network
30%
Failed fuel injector control module
20%
CAN bus network fault or short circuit
10%
Power supply failure to fuel injector module
5%
Module programming or software corruption
Diagnostic Steps
1
Step 1: Verify power and ground at fuel injector control module using multimeter
2
Step 2: Inspect all connectors to fuel injector module for damage, corrosion, or loose terminals
3
Step 3: Check CAN bus communication signals at module connector (2.5V nominal, 1V swing)
4
Step 4: Scan all modules to identify if communication loss is isolated or systemic
5
Step 5: Test fuel injector module operation or substitute with known-good unit
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The powertrain control module has lost network communication with the fuel injector control module. This affects fuel delivery management and engine operation.
The most common cause of U0105 (Lost Communication With Fuel Injector Control Module) is: Faulty wiring or connectors between fuel injector module and network
Typical repair costs for U0105 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine may run poorly, stall, or fail to start. Critical safety concern if engine dies while driving, especially in traffic or at high speed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0105 to identify the root cause.
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Quick Info
Category
Network
System
Fuel System / Network Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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