U014D: Lost Communication with Mirror Control Module B
Severity
Medium
System
Network Communication
What Does U014D Mean?
U014D is a diagnostic trouble code indicating: Lost Communication with Mirror Control Module B. 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 U014D
- ⚠️ Check Engine Light (MIL) illuminated
- ⚠️ No communication with Mirror Control Module B
- ⚠️ 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 Mirror Control Module B
- 🔍 Power or ground supply issue to Mirror Control Module B
- 🔍 Mirror Control Module B internal failure
- 🔍 Water intrusion damaging module or connectors
- 🔍 CAN bus termination resistor fault
Frequently Asked Questions
What does U014D mean?
U014D indicates: Lost Communication with Mirror Control Module B. The vehicle's computer has detected that the Mirror Control Module B is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code U014D?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U014D for extended periods may cause additional problems.
How much does it cost to fix U014D?
Repair costs for U014D 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 Mirror Control Module B for damage
- 🔧 Check power and ground supply to Mirror Control Module B
- 🔧 Replace failed Mirror Control Module B
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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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.
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