What are the common causes of U0266?

Image processing sensor B contaminated by dirt or fluid. An internal fault in the sensor element. A sensor signal that drifts out of range. An incorrect sensor for the application. Water or corrosion at the sensor connector.

Inspect image processing sensor B and clean any contamination. Verify the sensor matches the vehicle specification. Monitor the sensor signal on a scan tool. Check the connector and terminals for water or corrosion. Replace image processing sensor B if the signal stays bad. Clear the code and retest.

U0266

Lost Communication With Image Processing Sensor B

System: Network communication (U code)
Lamp: Check Engine Light
Category: Network Communications

What it means

U0266 means Lost Communication With Image Processing Sensor B.

Where it lives

For U0266, start at the sensor the description names.

Check these first

Image processing sensor B contaminated by dirt or fluid
An internal fault in the sensor element
A sensor signal that drifts out of range
An incorrect sensor for the application
Water or corrosion at the sensor connector

What to do next

Inspect image processing sensor B and clean any contamination
Verify the sensor matches the vehicle specification
Monitor the sensor signal on a scan tool
Check the connector and terminals for water or corrosion
Replace image processing sensor B if the signal stays bad
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.