Invalid Data Received From Catalyst Heater Control Module

Where it lives

For U04B6, start at the module the description names.

Check these first

• A low battery or charging fault that browns out the catalyst heater control module
• A fault inside the catalyst heater control module itself
• A loose, corroded, or water damaged connector at the catalyst heater control module
• An open or short in the catalyst heater control module wiring to the module that receives its data
• A lost power or ground feed to the catalyst heater control module

What to do next

1. Scan all modules and record the stored and pending network codes
2. Inspect the catalyst heater control module connector pins for corrosion, water, and looseness
3. Test the catalyst heater control module power and ground feeds under load
4. Check battery voltage and charging output
5. Repair or replace the catalyst heater control module if the circuit, power, and bus tests pass
6. Clear the code and retest to confirm the catalyst heater control module fault is gone

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