U0108 — Lost Communication With Alternative Fuel Control Module

What Does U0108 Mean?

U0108 is a diagnostic trouble code indicating: Lost Communication With Alternative Fuel Control Module. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U0108

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with Alternative Fuel Control Module
⚠️ Multiple warning lights may illuminate simultaneously
⚠️ Related system completely inoperative
⚠️ Multiple warning lights on dashboard

Common Causes

🔍 CAN bus wiring fault (open or shorted) to Alternative Fuel Control Module
🔍 Power or ground supply issue to Alternative Fuel Control Module
🔍 Alternative Fuel Control Module internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U0108 mean?

U0108 indicates: Lost Communication With Alternative Fuel Control Module. The vehicle's computer has detected that the Alternative Fuel Control Module is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U0108?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0108 for extended periods may cause additional problems.

How much does it cost to fix U0108?

Repair costs for U0108 typically range from $80 to $1200, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect CAN bus wiring to Alternative Fuel Control Module for damage
🔧 Check power and ground supply to Alternative Fuel Control Module
🔧 Replace failed Alternative Fuel Control Module

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

U0108: Lost Communication With Alternative Fuel Control Module