What does it mean?
U0686 is a Network and Communication (CAN bus, module communication) fault code. It indicates: Lost Communication With Catalyst Temperature Bank 2 Sensor 1.
Lost Communication With Catalyst Temperature Bank 2 Sensor 1
Severity
Low
Can I keep driving?
Usually drivable; have it fixed at the first opportunity.
How is this code read?
This is a standard OBD-II code; any basic scanner reads it on vehicles built after 2004.
- UNetwork
- 0Generic code
- 6Network / Communication
- 86Sequence number
Codes From the Same System
All Fault Codes- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
Related Similar Codes
- U0680Lost Communication With Barometric Pressure Sensor B
- U0681Lost Communication With Throttle/Pedal Position Sensor/Switch D
- U0682Lost Communication With Throttle/Pedal Position Sensor/Switch E
- U0683Lost Communication With Throttle/Pedal Position Sensor/Switch F
- U0684Lost Communication With Catalyst Temperature Bank 1 Sensor 1
- U0685Lost Communication With Catalyst Temperature Bank 1 Sensor 2
- U0687Lost Communication With Catalyst Temperature Bank 2 Sensor 2
- U0688Lost Communication With Throttle Position Sensor/Switch G
This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.