U0118 — Lost Communication With Fuel Additive Control Module

What Does U0118 Mean?

U0118 is a diagnostic trouble code indicating: Lost Communication With Fuel Additive 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 U0118

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with Fuel Additive 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 Fuel Additive Control Module
🔍 Power or ground supply issue to Fuel Additive Control Module
🔍 Fuel Additive Control Module internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U0118 mean?

U0118 indicates: Lost Communication With Fuel Additive Control Module. The vehicle's computer has detected that the Fuel Additive Control Module is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U0118?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0118 for extended periods may cause additional problems.

How much does it cost to fix U0118?

Repair costs for U0118 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 Fuel Additive Control Module for damage
🔧 Check power and ground supply to Fuel Additive Control Module
🔧 Replace failed Fuel Additive Control Module

1
Find your vehicle above
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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.

U0118: Lost Communication With Fuel Additive Control Module