U0685: Lost Communication With Catalyst Temperature Bank 1 Sensor 2
System
Vehicle Systems
What Does U0685 Mean?
U0685 is a diagnostic trouble code indicating: Lost Communication With Catalyst Temperature Bank 1 Sensor 2. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
What To Do Next
-
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.
Related Codes
U0680
Lost Communication With Barometric Pressure Sensor B
U0681
Lost Communication With Throttle/Pedal Position Sensor/Switch D
U0682
Lost Communication With Throttle/Pedal Position Sensor/Switch E
U0683
Lost Communication With Throttle/Pedal Position Sensor/Switch F
U0684
Lost Communication With Catalyst Temperature Bank 1 Sensor 1
U0686
Lost Communication With Catalyst Temperature Bank 2 Sensor 1
U0687
Lost Communication With Catalyst Temperature Bank 2 Sensor 2
U0688
Lost Communication With Throttle Position Sensor/Switch G