What Does U1108 Mean?
The vehicle's control modules cannot receive valid data from the electric traction inverter system over the SCP network. This is specific to hybrid or electric vehicles and indicates communication loss with the high-voltage power electronics.
Safety Warning
Vehicle may not move or may enter limp mode with limited propulsion. High-voltage system issues require trained technicians due to electrocution risk.
Common Causes
35%
Failed traction inverter module or internal communication circuit fault
25%
High-voltage system interlock open or safety system preventing inverter operation
20%
Damaged communication wiring between inverter and hybrid control modules
15%
Hybrid vehicle control module (HV ECU) communication failure
5%
12V auxiliary battery low voltage affecting inverter control circuits
Diagnostic Steps
1
Step 1: Check high-voltage system status and verify all safety interlocks are closed and HV system is active
2
Step 2: Verify 12V auxiliary battery voltage is adequate (above 12.4V) as inverter control circuits require stable power
3
Step 3: Use manufacturer scan tool to access inverter module and check for internal inverter fault codes
4
Step 4: Inspect high-voltage harness and inverter connectors for damage, proper seating, and signs of overheating
5
Step 5: Check communication line continuity between inverter and hybrid control module; verify proper CAN/SCP signals
Estimated Repair Cost
$200 - $4,500
Parts + labor, varies by vehicle and location
The vehicle's control modules cannot receive valid data from the electric traction inverter system over the SCP network. This is specific to hybrid or electric vehicles and indicates communication loss with the high-voltage power electronics.
The most common cause of U1108 (SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter)) is: Failed traction inverter module or internal communication circuit fault
Typical repair costs for U1108 range from $200 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not move or may enter limp mode with limited propulsion. High-voltage system issues require trained technicians due to electrocution risk.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1108 to identify the root cause.
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Quick Info
Category
Network
System
Hybrid/Electric Propulsion System
Difficulty
Type
Manufacturer
Recommended Tools
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