U0163: Lost Communication With Navigation Control Module
What Does U0163 Mean?
U0163 is a diagnostic trouble code indicating: Lost Communication With Navigation Control Module. This code relates to the network communication system. It has been reported in NHTSA complaints across 1 different vehicle models.
Symptoms of U0163
- ⚠️ Check engine light illuminated
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"2018 Camry with very low mileage (appx 38,000) and had all its required services done, suddenly had a check engine light. Less than a minute after that, "Coolant Temp High - Stop where it's safe" message popped up. Service center indicated it was a failed water pump (diagnostic codes P26CB71, U0073"
— Toyota Camry owner, 08/19/2025
Source: NHTSA Complaints Database
Most Reported Vehicles for U0163
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | TOYOTA CAMRY |
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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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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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.