NOx Sensor B Received Invalid Data From ECM/PCM

Where it lives

For U05A2, start at the sensor the description names.

Check these first

• A failed heater or sensing element in NOx sensor B
• A loose, corroded, or water damaged connector at the NOx sensor B
• An open or short in the NOx sensor B wiring to the module that receives its data

What to do next

1. Scan all modules and record the stored and pending network codes
2. Check the NOx sensor B data bus wiring for opens, shorts, and chafing
3. Repair or replace the NOx sensor B if the circuit, power, and bus tests pass
4. Clear the code and retest to confirm the NOx sensor B fault is gone

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