Control Module Communication Bus B Off

Where it lives

For U0074, the part to look at first is the module named here.

Check these first

• Loss of power or ground to a module on bus B
• An open in the bus B wiring feeding that module
• A corroded or backed out pin at the module connector on bus B
• An internal failure in the module that is off bus B

What to do next

1. Read stored codes on every module that shares bus B
2. Check power and ground at the module that is off bus B
3. Test the bus B wiring to that module for an open
4. Check the module connector pins on bus B for corrosion
5. Replace the module that stays off bus B and program it
6. Clear the code and retest

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