U011A — Lost Communication With Exhaust Gas Sensor Module A

What Does U011A Mean?

U011A is a diagnostic trouble code indicating: Lost Communication With Exhaust Gas Sensor Module A. 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 U011A

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

Frequently Asked Questions

What does U011A mean?

U011A indicates: Lost Communication With Exhaust Gas Sensor Module A. The vehicle's computer has detected that the Exhaust Gas Sensor Module A is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U011A?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U011A for extended periods may cause additional problems.

How much does it cost to fix U011A?

Repair costs for U011A 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 Exhaust Gas Sensor Module A for damage
🔧 Check power and ground supply to Exhaust Gas Sensor Module A
🔧 Replace failed Exhaust Gas Sensor Module A

1
Find your vehicle above
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2
Check for recalls
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

U011A: Lost Communication With Exhaust Gas Sensor Module A