What are the common causes of U0010?

An open or short in the medium speed CAN wiring. Corroded or damaged medium speed CAN connectors. A failed control module dragging the medium speed CAN down. Incorrect termination resistance on the medium speed CAN network.

Read the code and check for modules that are offline on a scan tool. Check the medium speed CAN wiring for open and short faults. Measure bus resistance across the medium speed CAN terminals. Inspect the medium speed CAN connectors for corrosion. Isolate modules one at a time to find the one dragging the bus. Clear the code and retest.

U0010

Medium Speed CAN Communication Bus

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

What it means

U0010 means Medium Speed CAN Communication Bus.

Check these first

An open or short in the medium speed CAN wiring
Corroded or damaged medium speed CAN connectors
A failed control module dragging the medium speed CAN down
Incorrect termination resistance on the medium speed CAN network

What to do next

Read the code and check for modules that are offline on a scan tool
Check the medium speed CAN wiring for open and short faults
Measure bus resistance across the medium speed CAN terminals
Inspect the medium speed CAN connectors for corrosion
Isolate modules one at a time to find the one dragging the bus
Clear the code and retest

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Updated

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